The following essay from George Monbiot is a difficult read but it is also a necessary read.
With the news that the polar ice caps are retreating, just read yesterday: “Polar ice caps and sheets are shrinking at alarming rates due to global warming, with Arctic sea ice decreasing by over 12% per decade and polar ice sheets losing 7,560 billion tonnes of ice between 1992 and 2020. Greenland and Antarctica are losing hundreds of billions of tons of ice annually, significantly contributing to rising sea levels. [1, 2, 3, 4]”
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Alternating Current
Posted on 29th April, 2026
If this crucial circulation system shuts down, the civilisational impacts will be irreversible. So why isn’t it a top priority?
By George Monbiot, published in the Guardian 23rd April 2026
The poor and middle pay taxes, the rich pay accountants, the very rich pay lawyers – and the ultra-rich pay politicians. It’s not an original remark, but it bears repeating until everyone has heard it. The more money billionaires accumulate, the greater their control of the political system – which means they pay less tax, which means they accumulate more, which means their control intensifies.
They reshape the world to suit their demands. One of the symptoms of the pathology known as “billionaire brain” is an inability to see beyond their own short-term gain. They would sack the planet for a few more stones on the pointless mountain of wealth. And we can see it happening. Last week delivered the biggest news of the year so far, perhaps the biggest news of the century. But partly because billionaires own most of the media, most people never heard it. We might find ourselves committed to a civilisation-ending event before we even learn that such a thing is possible.
The news is that the state of a crucial oceanic circulation system has been reassessed by scientists. Some now believe that, as a result of climate breakdown changing the temperature and salinity of seawater, it is more likely than not to collapse. This system – known as the Atlantic meridional overturning circulation (Amoc) – delivers heat from the tropics to the North Atlantic. Recent research suggests that if it shuts down, it could cause both a massive drop in average winter temperatures in northern Europe and drastic changes in the Amazon’s water cycles. This could help tip the rainforest into cascading collapse and trigger further disaster.
Amoc’s shutdown is likely also to cause an acceleration of sea level rise on the east coast of the US, threatening cities. It could also raise Antarctic temperatures by roughly 6C and release a vast pulse of carbon currently stored in the Southern Ocean, accelerating climate catastrophe.
Even when the countervailing effects of generalised global heating are taken into account, a further paper proposes, the net impact in northern Europe would be periods of extreme cold – including events in which temperatures in London fall to -19C, in Edinburgh to -30C and in Oslo to -48C. Sea ice in February would extend as far as Lincolnshire. Our climate would change drastically, with the likelihood of far greater extremes, such as massive winter storms. Rain-fed arable agriculture would become impossible almost everywhere in the UK.
This shift, on any realistic human scale, would be irreversible. Its speed is likely to outrun our ability to adapt. Amoc shutdowns, driven by natural climate variability, have happenedbefore. But not in the era of large-scale human civilisation.
The first paper proposing that Amoc might have an on-state and an off-state was published in 1961. Since then, many studies have confirmed the finding and explored potential triggers and likely implications. Until recently, Amoc collapse caused by human activity fell into the category of a “high impact, low probability” event, devastating if it happens, but unlikely to occur.
Research over the past few years prompted a reassessment: it began to look more like a “high impact, high probability” event. Now, in response to last week’s paper, Prof Stefan Rahmstorf – perhaps the world’s leading authority on the subject – says the chances of a shutdown look like “more than 50%”. We could pass the tipping point, he says, “in the middle of this century”.
So why is this not all over the news? Why is it not the top priority for the governments that claim to protect us from harm? Well, in large part because oligarchic power has championed a model of climate impact that bears little relation to reality: that is, they have a hypothesis about how the world works that is completely detached from scientific findings. This model underpins official responses to the climate crisis.
It began with the work of the economist William Nordhaus, who sought to assess the economic effects of global heating. His modelling suggests that a “socially optimal” level of heating is between 3.5C and 4C. Most climate scientists see a temperature rise of this kind as catastrophic. Even 6C of heating, Nordhaus suggests, would cause a loss of just 8.5% of GDP. Climate science suggests it would look more like curtains for civilisation.
As the eminent economists Nicholas Stern, Joseph Stiglitz and Charlotte Taylor have argued, the mild effects Nordhaus forecasts are merely artefacts of the model he has used. For example, his modelling assumes that catastrophic risks do not exist and that climate impacts rise linearly with temperature. There is no climate model that proposes such a trend. Instead, climate science forecasts nonlinear impacts and greatly escalating risk.
The likely impacts of high levels of heating include the inundation of major cities, the closure of the human climate niche (the conditions that sustain human life) across large parts of the globe, the collapse of the global food system and cascading regime shifts – that is, abrupt transitions in ecosystems – releasing natural carbon stores, potentially leading to a “hothouse Earth” in which very few survive. Never mind a few points off GDP: there would be no means of measurement and scarcely an economy to measure.
Bizarrely, the modelling also applies discount rates to future people: their lives, it assumes, are worth less than ours. In other words, it has taken a method used to calculate returns to capital and applied it to human beings. As the three economists point out, “it is very difficult to find a justification for this in moral philosophy.” Moreover, climate impacts disproportionately affect the poor – but under the models, their lives are also priced down.
Unsurprisingly, models of this kind, Stern, Stiglitz and Taylor note, have been seized on by “special interests” such as the fossil fuel industry to argue for minimal responses to the climate crisis. And it’s not just the oil companies. Bill Gates, who claims to want to protect the living planet, has given $3.5m (£2.6m) to a junktank run by Bjorn Lomborg, who has built his career on promoting Nordhaus’s model, thus helping to downplay the need for climate action. Nordhaus was awarded the Nobel Memorial prize for economics for his pernicious nonsense – and it is deeply embedded in government decision-making.
A billionaire death cult has its fingers around humanity’s throat. It both causes and downplays our existential crisis. The oligarchs are not just a class enemy but, as they have always been, a societal enemy: a few thousand people can destroy civilisations. It’s the billions v the billionaires, and the stakes could not possibly be higher.
Until I came to live in the the USA permanently, in 2010, I used to live in South Devon, near Totnes. Thus the AMOC was very familiar to me and the local population. AMOC stands for Atlantic Meridional Overturning Circulation. Much more information on AMOC may be read on the WikiPedia site.
Although the future of the AMOC is uncertain, many scientists are concerned that the AMOC will weaken.
The above article by George Monbiot is potentially frightening. As Monbiot says at the end; “… a few thousand people can destroy civilisations.“
What we need is a few thousand people to make this the number one priority! Not tomorrow but today!
The astronauts on Artemis II’s trip to the Moon in April 2026 didn’t just have an amazing journey through space. They also saw something extraordinary. They were the first humans to see a total solar eclipse from space.
From Earth, the circle of the Sun is about the same size as the circle of the Moon. With the bright circle blocked, you can see the undulating rays of the Sun’s corona, or outer atmosphere, that are normally too dim to be observed.
During my second total eclipse, the period of totality – that short span when you can remove your protective glasses and look directly at the eclipse – lasted close to 4 minutes. I saw waves of diffuse light snaking around an ink-black hole in the sky. It looked very wrong – almost alien.
On Aug. 12, 2026, there will be another total solar eclipse, visible only from Greenland, Iceland, Spain and the Balearic Islands of the Mediterranean. Some fortunate viewers in Spain and nearby islands may see the eclipse just before sunset, low on the horizon. The Moon illusion, a phenomenon where the Moon looks bigger when it’s near the horizon, might make this eclipse look unusually large.
Unusual eclipse perspectives
Astronauts will occasionally also have less common eclipse experiences. I interviewed one I call by the pseudonym “Jackie” in my research about astronauts’ experiences of awe. She was part of an astronaut training group that did a flight exercise during a total solar eclipse.
Jackie and her squad flew their jets in the shadow of the Moon. This lengthened their time in totality because they could follow and stay within the shadow. Jackie was most impressed with how the Sun’s corona seemed to shift and ripple.
“It’s not static … it’s alive,” she told me.
On April 6, 2026, the astronauts of NASA’s Artemis II mission saw another kind of unusual eclipse as they flew around the Moon. At one point during their flight, the Moon and the spacecraft aligned so that the Moon was directly between them and the Sun, blocking the Sun’s disk in a way that looks very different from what we see on Earth.
The astronauts were so close to the Moon that the Moon looked bigger than the Sun and hid more of its bright circle. Earth was also in view, and sunlight reflected from the Earth onto the Moon in a phenomenon NASA calls “earthshine.” This dim light is very similar to the moonlight that shines on the Earth at night.
Imagine the Sun hidden behind the Moon, creating a hazy halo around the Moon’s edges. At the same time, faint light reflected from Earth softly illuminates the Moon, revealing mountains and craters in a dim twilight. Now imagine this striking scene lasting 54 minutes.
This sight was, without a doubt, one of the most unusual eclipses ever seen by human eyes.
Although Artemis’ astronauts are trained to think scientifically, this experience propelled them into a state of awe. They talked openly about how their brains were “not processing” what they observed. While NASA kept them busy with a variety of tasks, the sound of emotion and excitement in their voices as they broadcast live from their lunar flyby was unmistakable.
The Moon during a solar eclipse on April 6, 2026, photographed by one of the Orion spacecraft’s cameras during Artemis II. Earth is reflecting sunlight at the left edge of the Moon, called ‘earthshine.’ NASA
One astronaut said she gained an awareness of the fragility of our planet that now shapes everything she does, while another described becoming more curious after returning to Earth. A third said the awe he experienced in lunar orbit changed his understanding of time and infinity.
Space travel creates many opportunities for awe, but a solar eclipse from behind the Moon, as Mission Commander Reid Wiseman put it, required “20 new superlatives.”
It’s an experience most of the earthbound eclipse-chasers heading to Greenland or Iceland or Spain this summer will only dream about. Whether eclipses happen in space or on Earth, though, close encounters with the grandeur of our universe can make you feel profoundly human.
In this difficuly world at present, this is a perfect article. As was written, “…. the awe he experienced in lunar orbit changed his understanding of time and infinity.“
During the week of the 20th to 24th April, 2026, BBC Radio 4, immediately after the World At One, at 13:45-14-00 BST, presented a fifteen-minute series on death. The episode of the April 22nd, 2026 was called Lay This Body Down. It is summarised as follows:
As our society becomes more secular, more people feel like they want to do death their own way. That’s leading to a range of new options for disposing of dead bodies.
Now watch this:
Jean and I have opted for human composting after we have died. It is a natural process and details may be found here.
Winter is more than just a season in the western U.S. – it is a savings account to get farms and homes through the long, dry summer ahead. As the snowpack that accumulates in the mountains through winter slowly melts in late spring and summer, it feeds into rivers and reservoirs that keep communities and ecosystems functioning.
The April 1 snowpack measurement has long been the single most important number in western water management, considered a strong proxy for how much water the mountains are holding in reserve.
Across the western United States, temperatures from November through February were among the warmest on record, with many areas 5 to 10 degrees Fahrenheit (2.8 to 5.5 degrees Celsius) above the 20th-century average. March continued to break heat records. At lower elevations, the higher temperatures meant a significant part of the winter’s precipitation fell as rain rather than snow. In some places, snowfall accumulated but melted quickly during warm periods.
The total area of the western U.S. with snow cover was exceptionally low compared with the rest of the 21st century. National Snow and Ice Data Center
As a result, even regions that received near- or above-normal precipitation for the season failed to build substantial snowpack. In the northern Rockies and the mountains of the Pacific Northwest, any above-average snow accumulation was largely confined to the highest elevations, while middle and lower elevations had relatively little snowpack.
This situation is a hallmark of warming winters. As global temperatures rise, the freezing line where precipitation changes from rain to snow moves up the mountains, shrinking the area capable of sustaining a seasonal snowpack.
At the vast majority of the U.S. Natural Resources Conservation Service’s snow measurement stations across the West, the snowpack’s snow-water equivalent on March 30, 2026, was less than 50% of the 1991-2020 median. Natural Resources Conservation Service
The exceptionally warm winter of 2025–26 across much of the western U.S. delivered a powerful preview of what the regional water cycle in a warmer climate may increasingly look like: less snow and a fundamental reshaping of the hydrograph – the chart of how much water flows through streams across the year.
A flattening hydrologic pulse
The consequences of this shift for water supplies are already visible in streamflows.
In multiple river basins in the West, streamflows were above average in winter and early spring, and some locations were approaching record-high levels. Historically, that water would have remained frozen in the snowpack until late spring. Instead, precipitation arriving as rain – along with intermittent midwinter melting events – increased the runoff.
Scientists who study natural water flows, as I do, pay attention to the hydrographs of streamflows in river basins to see when the water flow in mountain streams is strongest and how long that flow is likely to continue into summer.
This hydrograph showing two years of water flows in the St. Mary River near Babb, Mont., reflects the difference between a typical late-spring peak, as 2025 saw, and several midwinter peaks from warm temperatures and rain, as 2026 is seeing. U.S. Geological Survey
In recent years, rising temperatures have led to a redistribution of streamflows throughout the winter and early spring in ways that are fundamentally reshaping the hydrographs of snowmelt-dominated rivers. Rather than a single dominant peak during late spring or early summer, smaller peaks emerge in winter and early spring. At the same time, the traditional snowmelt pulse, relied on to fill reservoirs in late spring, weakens.
In effect, the hydrograph is flattening. The winter of 2025–26 illustrates this phenomenon: Higher early-season streamflows suggest the West will see less runoff later in the year when communities, farms and wildlife need it.
The Colorado River: A system on the edge
Nowhere does the convergence of record warmth, depleted snowpack and altered hydrology carry higher stakes than in the Colorado River Basin. More than 40 million people in seven states plus Mexico and 5.5 million acres of farmland depend on the river’s water, but the river’s flow is no longer meeting demand.
The April-through-July 2026 runoff into Lake Powell – the reservoir behind Glen Canyon Dam and the primary index of the Upper Colorado River Basin’s annual water budget – is currently forecast to rank among the lowest in recent decades. It has been tracking close to the grim years of 2002 and 2021, considered benchmarks of western drought.
Unless spring brings substantial late-season snowfall to the high mountains, 2026 could join those years as a marker of how thin the margin between water supply and demand has become in a river system already under sustained stress from two decades of drought and water overuse.
The low reservoir levels in the basin in 2026 and the low snowpack are adding fears of water shortages just as the seven states that rely on the Colorado River are struggling to reach a new water use agreement.
The changing rhythm of water in the West
The winter of 2025–26 highlights two emerging realities.
First, temperature is increasingly dominating precipitation in determining western water supplies. Even above-normal precipitation cannot compensate for persistent warmth when it falls as rain rather than snow and accelerates snowmelt in the mountains.
Second, the nature of the West’s streamflows is shifting in ways that complicate water management.
Rain-on-snow events can produce flooding in winter, as the Seattle area saw in late December 2025. A low snowpack also means less runoff in summer, which can exacerbate water shortages and raise the wildfire risk as landscapes dry out. Even if a year has normal precipitation, if it falls as rain or there is earlier snowmelt, then evaporation through summer, in a warmer climate, will leave less water in the system.
Snowpack declines, earlier runoff, elevated winter flows and flattened hydrographs are all consistent with long-standing projections for the western United States as global temperatures rise.
What makes the winter of 2025-26 notable is how clearly these signals appeared, even in a year without widespread precipitation deficits.
This shift highlights the need for adaptive reservoir operations – the ability to adjust water storage and release decisions in real time to capture earlier runoff and preserve water for longer dry seasons, while still maintaining space in reservoirs for flood control during wetter winters. For communities across the West, it also reinforces the growing reality that the familiar seasonal rhythm of mountain water is changing.
These are the deer in our garden. I feed them every morning and they have become good friends. However, taking the photos was tricky as I had to use a zoom lens and I did not have a tripod with me.
For many years I lived in South Devon, England. I never thought twice about hedgerows because they were so common.
Then today I read an article in The Economist about Brexit and the one thing that was favourable was this “Brexit delivers a win for British wildlife.“
Here’s a small extract from the magazine:
No other country matches the rich heritage of hedgerows that weave across the damp (ideal for hedges) British Isles. Since the Bronze Age, Britons have reared sheep and cattle and have used hedges to mark the boundaries of fields and keep livestock in place. Some of these ancient bushes still stand. In West Penwith, one such prehistoric hedge, a gurgoe, might be over 4,000 years old. Most, though, were planted in the 18th century, when landowners enclosed the commons, an event that turned the country into a chequerboard of small, irregular fields. America, by contrast, passed a law prohibiting private landowners from enclosing public land in 1885, protecting its open ranges.
Here in Oregon hedges are not so common. But I did some research as to the cause and came upon this article by Oregon State University.
I trust it may be shared with you.
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A Guide to Hedgerows: Plantings That Enhance Biodiversity, Sustainability and Functionality
We see them at the edges of farm fields or along roads: long rows of trees, shrubs, flowers and grasses known as hedgerows. They are living fences with the ability to grow food, shelter wildlife, save water, manage weeds and look beautiful all year round.
Hedgerows are sometimes called shelter belts, windbreaks or conservation buffers. These layers of plant life enhance the beauty, productivity and biodiversity of a landscape.
Hedgerows originated in medieval Europe and are enjoying a modern resurgence. People in England planted hawthorn cuttings and allowed them to grow about 6 feet. They were bent and trained to fill gaps in the trees, yielding a living fence. They called these fences “hagas” or hedges, form the word “hawthorn.” As the birds settled in the hawthorns and dropped seeds. more plants sprung up. Today, many farms in England are surrounded by ancient hedgerows that shelter beneficial organisms and conserve soil and water.
Hedgerow plantings were uncommon in the early United States. In the 1930s, the U.S. Department of Agriculture’s Shelterbelt Program briefly supported planting trees for windbreaks to prevent soil erosion in the Midwest. Today, as interest surges in sustainable farming methods, more people are turning to this age-old practice.
Hedgerows can serve several ecological functions. Among their many benefits, hedgerows:
Enhance ecological biodiversity.
Offer food for livestock, humans and wildlife.
Provide habitat for beneficial insects and pollinators.
Facilitate water conservation.
Provide windbreaks.
Help manage invasive weeds.
Provide erosion control and improve soil health.
Support the health of aquatic habitats.
Enhance carbon sequestration.
Create borders and privacy screens.
Reduce noise, dust, chemical drift and other types of pollution.
Diversify farm income.
Generate year-round beauty.
Let’s look at these benefits in detail.
Benefits of hedgerows
Enhance ecological biodiversity
Biodiversity describes the variety of life forms within a specific ecosystem and the relationship of these organisms to one another and the broader environment. Hedgerows can be designed to attract a wide variety of mammals, birds, reptiles, amphibians, insects and plants, many of which offer beneficial relationships to each other. They also create more edges, or “ecotones,” between different habitats, which increases species diversity. Trees and shrubs provide shelter for larger mammals, and nesting sites and perches for raptors, which are important predators of rodents. Dense or thorny shrub thickets can offer songbirds a refuge to escape predators as well as a place to nest. The diverse composition and structure of a hedgerow creates a functional habitat where species experience vital interconnections with one another and the environment.
Offer food for livestock, humans and wildlife
Hedgerows provide undisturbed refuge for species of all kinds, creating wildlife corridors, travel lanes or habitat islands. Hedgerows help protect wildlife from predators and provide sheltered access to riparian zones or other water sources. These corridors are especially important in fragmented landscapes, such as fields where only a single crop is grown. Hedgerows provide shade to reduce heat stress and help to block wind currents. These measures support a healthier wildlife population. Berry-producing plants encourage insectivores, such as birds, that also prey upon common crop pests. The hedgerow habitat creates cover for wildlife so they can feed, nest and care for their young.
Provide habitat for beneficial insects and pollinators
Planting a variety of flowering trees, shrubs, forbs and perennial plants provides insect habitat, and nectar and pollen sources throughout the year for beneficial insects and pollinators. Plants in the family Umbelliferae attract parasitic wasps; predator flies such as hover flies, lacewings and ladybeetles; and true bugs, like ambush or minute pirate bugs. Flowering plants in this family include coriander, dill, fennel, parsnip, parsley and carrots. These plants are useful in the kitchen and are also very attractive to pollinators. Over 75% of successful production of food requires pollination. Increasing plant habitat for pollinator species improves fruit set, size and quality, as well as general biodiversity. Pollinator habitat also attracts beneficial insects, which prey on many crop pests. Increasing the numbers of beneficial insects can help farmers manage crop pests and cut down on insecticide use.
Facilitate water conservation
Hedgerows retain water and reduce evaporation by reducing wind speed and providing cover over the ground surface. Plants also catch and store water in their root systems, leaves and branches, slowing the rate of excess rainwater entering waterways and reducing the risk of flooding. Decaying matter from the roots, stems and branches of hedgerow plants increase the organic matter in the soil over time. This increases the soil’s ability to absorb and retain water. Planting hedgerows on hillsides helps conserve water and soil by reducing erosion. If planting near adjacent cropland, periodic root pruning can reduce competition for nutrients and water.
Provide windbreaks
Properly designed hedgerows can reduce wind speed by as much as 75% and improve crop performance. This is especially effective when plantings reach a density of 40%–50% and are planted perpendicular to the prevailing wind. Wind-resistant trees usually have flexible, wide-spreading, strong branches and low centers of gravity. Wind-tolerant shrubs often have small, thick or waxy leaves or very narrow leaves or needles, to help control moisture loss. Wind can disturb pollination and damage fruit and flowers when plant parts thrash against each other. During times when soil is exposed, a windbreak can protect topsoil from erosion. Crops under wind stress also put energy into growing stronger roots and stems, resulting in smaller yields and delayed maturity. Strong winds also cause lodging of grain and grass crops, bending the stems and making harvest more difficult. Winds dry out crops on the field edges, increasing pests such as two-spotted spider mites.
Help manage invasive weeds
Hedgerows planted along roads or between crop fields may prevent weed seeds from blowing into the field. The weed seed pods collect on hedgerow plants, where a farmer could remove and burn them. Hedges can prevent millions of weed seeds from entering the crop field. As hedgerows mature, these plantings displace invasive weeds. If well maintained, this weed management lasts the lifetime of the hedgerow.
Provide erosion control and improve soil health
Rain, irrigation, clean cultivation and vacant field borders can all increase erosion potential in an agricultural system.
Hedgerow plantings can significantly reduce the amount of soil erosion on a landscape. They can also provide a barrier to filter out pollutants, such as pesticides, and slow down sediments and organic material that can flow from farm fields into waterways. This is accomplished by increasing the surface water infiltration rate and improving soil structure around the root zone. This, in turn, decreases fertilizer runoff from farm fields. The biomass that plants shed acts as a soil conditioner and can enhance plant growth. In urban or suburban environments, hedges similarly reduce pollutants from neighboring sites.
Support aquatic habitat
Hedgerows can provide shade to riparian areas. Shade reduces water temperatures, prevents water evaporation and improves watershed quality. Though many factors influence watershed temperatures, studies have proven that lowland streams bordered by trees and tall shrubs exhibit cooler temperatures. The hedgerow’s latitude, stream aspect, leaf density and the height of its vegetation from the water surface all affect water temperature.
Enhance carbon sequestration
During photosynthesis, trees, shrubs and grasses absorb carbon dioxide from the atmosphere, allowing the carbon to become part of the plant’s tissue. As plants die or shed tissue — either through natural processes or pruning — the carbon that was stored in the plant breaks down and enters the soil. Plants store relatively large amounts of carbon in their biomass, helping to offset some of the effects of climate change. A tree can absorb as much as 48 pounds of carbon dioxide per year and can sequester, or store, 1 ton of carbon dioxide by the time it reaches 40 years old.
Create borders and privacy screens along roads and between properties
Hedgerows are attractive borders and can block undesirable views. Evergreens offer year-round screening. When selecting plants, consider the height at maturity for optimum screening. Evergreens can be pruned to control height and density. Plant a diverse mix of species to help protect against damage from a single pest or disease.
Reduce noise, dust, chemical drift and other types of pollution
As hedgerows mature and become dense, they can create barriers to reduce noise, dust, chemical drift and other pollutants. Open canopy trees are effective barriers to dust and pesticides; air and particles slowly filter through them instead of depositing clouds of pollutants on the other side of the hedge.
Plant hedges as close as possible to any areas where pollutants are a concern. This can help alleviate neighborhood conflicts where agriculture intersects with urban areas.
Hedgerows can act to contain contaminants from urban or suburban environments and keep them from entering agricultural areas.
Diversify farm income
Trees, shrubs and herbaceous plants in a hedgerow can also serve as sources of income. Potential products include nuts, fruits, berries, leaves, flowers, seeds, bark and medicinal herbs. You can grow plants to be propagated as seeds, rootstock, cuttings and transplants. Other potential crops are nursery stock and floral materials, including ferns, broadleaf evergreens, flowers and willows grown for craft material and furniture. You can grow fruits, berries and nuts for food. Hedgerows can shelter bees and encourage a higher pollination rate. Consider planting trees for secondary wood products such as lumber, veneer, firewood, chips for bedding and mulch. Game birds such as quail, pheasant and sage grouse are attracted to hedgerows. Managed hunting can provide a potential source of food and off-season revenue for landowners.
Generate year-round beauty
Hedgerows in the landscape add continuous beauty. You can design a hedge for year-round interest, considering the color and texture of leaves and bark, bloom color and timing, and the general growth habit or form of plants.
Hedgerow design Graphic: Kerry Wixted with graphics from Tracey Saxby, IAN Image Library, courtesy of the Integration and Application Network, University of Maryland Center for Environmental Science
Whether in rural or urban settings, the principles of planning a hedgerow are the same: Evaluate the site, determine what you would like to accomplish with the plantings, match the right plant with the right place, and properly prepare the site.
Design
There are many essential components to consider when designing a multifunctional hedgerow. The first step is to observe the site where the hedge is to be planted and take into consideration the ecological and environmental conditions listed below. These elements influence the design, plant selection, location and the size of the area to be planted. Although a single line of trees will provide some benefits, four or more rows of plants are optimal for windbreaks, water and soil conservation, wildlife habitat and general biodiversity. When it works for the situation, place plants tallest at maturity in the center row, with shorter ones inter-planted between and along the edges. A diverse selection of plant sizes and characteristics is most beneficial. When possible, orient rows perpendicular to prevailing winds.
Hedgerows following land contours create meandering lines on the landscape, producing a natural appearance and larger buffer for wildlife habitat. If the goal is to attract pollinator species, reserve approximately one half-acre for every 40 acres planted in crops.
Plant selection
Plant a wide variety of multi-tiered plants for maximum habitat. Avoid varieties that are susceptible to common pests and diseases and choose plants that are non-invasive. Some perennial species such as blackberry can provide excellent wildlife habitat and food crops but are highly invasive and require frequent maintenance. See the plant lists on page 7 for plantings suited to the Pacific Northwest.
When selecting plants, consider the conditions plants need to survive in specific habitats:
Range: place of origin (indigenous, native/non-native).
Hardiness zones: frost dates.
Light requirements: sun or shade.
Size of plants at maturity, growth.
Soil type (pH, fertility, erosion concerns).
Drainage.
Water movement and moisture needs.
Planting time.
Bloom time: seasonal interest.
Day length.
Productivity.
Tolerance to heat, cold, salt, drought, pollution, wind and wild or domestic animals.
Evergreen or deciduous.
Plant structure: form or shape, texture, leaf and bark type.
Edible or poisonous: what parts.
Insect and disease resistance.
Plant size, costs and availability.
Maintenance needed.
Allellopathy: a chemical inhibitor of one plant to another which can impact germination or plant growth.
Ultimately, place plants together that have similar soil, water, sun and drainage needs.
General planting recommendations:
Plant trees and shrubs about 6 to 8 feet apart in rows 8 to 10 feet apart.
Plant one or two rows of tall trees flanked by a row or two of shrubs. A 20-foot wide hedgerow can have two rows of shrubs flanking a row of trees.
Hedgerows work best for wildlife when they are wider than 20 feet.
Depending on the site’s prevailing winds, a winter windbreak could have at least two rows of evergreen trees and a row of deciduous trees or shrubs. A summer windbreak could have at least one row of tall deciduous trees and a row of deciduous shrubs.
Make sure the planting holes are deep and wide enough to accept and cover the roots of each plant. Be sure to water in each new planting.
In a small area, place a 3-inch layer of straw mulch or cardboard around each tree and shrub after planting to discourage weeds and encourage plant survival.
Soil preparation
Soil preparation is one of the keys to plant survival. On a smaller site, an easy way to establish planting areas in existing grass or pasture is to apply a thin layer of compost or manure, followed by several layers of cardboard, and mulch such as straw or leaves. Worms are attracted to the manure and will work over the winter to decompose grasses and fertilize the soil. However, this method may not be practical on a large scale. In this instance, prepare the area for planting by tilling the ground in spring and planting an early cover crop such as crimson clover, followed by buckwheat. In late summer, till or disc in the cover crop and replant an overwintering cover crop such as crimson clover, field peas or vetch. Cover crops improve soil fertility, reduce weeds, stabilize the soil and attract beneficial insects. Till again the following spring and install the first set of plantings for the hedgerow.
Another option for sites with high weed pressure is solarization. Closely mow the ground and put down UV-stabilized anti-condensation greenhouse plastic in midsummer for several weeks to kill the weeds. After solarization, remove the plastic and follow with a fall planting.
Planting time
In more temperate environments, fall planting allows roots to become established before foliage emerges and gives plants the benefit of winter rains. In extreme cold climates, early spring may be the ideal time for planting. At the time of planting, apply amendments such as compost or manure as a top dressing.
Irrigation
To increase the success rate of your hedgerow planting, provide supplemental water for the first two or three years. Irrigate once a week during the heat of the summer during the first year. For the second year, water every two weeks. In the third year, irrigate once a month. Irrigation needs depend on the location and the plants selected. Be sure to water deeply to encourage deep root growth. Most hedgerow plantings may not survive if they do not get supplemental water in the first few years. Water can be supplied by swales, furrows, flood, drip irrigation or hand watering. If the hedgerow is next to cropland, overhead irrigation from the crop can be extended to water the hedge.
Keeping out weedy plants and destructive wildlife
One of the biggest challenges in establishing a hedgerow is keeping unwanted plants from taking over the new plantings. There are a variety of techniques to inhibit these weedy plants. The simplest method is to leave alleys between plant rows for mowing, cultivation or mulching until plants are well established. Ideally, an area 6 to 8 feet wide around the hedgerow should be mowed, flailed or tilled for weed management, fire protection and rodent control. It is also important to mulch heavily with a minimum of 3 inches of leaves, straw, sawdust or cardboard around each plant. As plants mature, they will eventually shade out most annual weeds. This is the ideal time to infill with low-growing, shade-tolerant plants.
If needed, protect plants from beaver and nutria with hardware cloth, and use partially buried plastic-coated cardboard or tubing around tree trunks to protect from voles and mice. If applying pesticides, follow the label in order to protect riparian zones along rivers, creeks and ponds from contamination.
Managing a hedgerow in the first few years is similar to managing a crop. Good weed management during establishment results in less labor to control weeds in seasons to come.
Cost of establishment
Planting hedgerows does not have to be expensive. Seedling plants are available at low cost, and you can propagate new plants from existing plantings. The larger the plant, the sooner it will reach maturity, which is especially important in creating a fast-growing privacy screen. This can be achieved by purchasing dormant bareroot plants and 1-gallon potted plants or larger. Remember, these larger plants will most likely require summer irrigation. Government programs are available to assist landowners with hedgerow development. Many counties have tax exemption programs for riparian lands, along with wildlife habitat conservation and management programs. See “Incentive programs to help with hedgerow establishment” and Estimated Costs To Establish Pollinator Hedgerows, in “Resources,” pages 9–10.
Conclusion
A hedgerow is a long-term commitment. With proper planning and care, it will take approximately four to eight years to establish a hedgerow and 30 or more years for it to reach maturity. To encourage success, draft a plan with planting installments for each year, depending on your goals and budget.
Hedgerows in rural agricultural or urban settings provide many benefits that increase over time, including the opportunity for supplemental income. With benefits for wildlife, humans and the planet, hedgerows are a practice that has stood the test of time.
Hedgerow plants
Hedgerows can contain native and non-native plants, although plants should not be invasive. The following trees, shrubs, groundcovers and perennial plants are appropriate for hedgerows in the Pacific Northwest. Remember to consider proper site selection and plant requirements. Plants that tolerate wet soil are indicated by an asterisk (*).
Sun-tolerant plants under 25 feet
Arbutus unedo Strawberry tree
Aronia Chokeberry Schubert
Baccharis pilularis consanguinea Coyote brush
Ceanothus velutinus Tobacco brush
Cornus stolonifera Red twig dogwood
Diospyros kaki Japanese persimmon
Diospyros virginiana American persimmon
Elaeagnus multiflora Goumi
Elaeagnus umbellata Autumn olive
Ficus carica Fig
Fuchsia magellanica Hardy fuschia
Lonicera caerulea Blue honeyberry
Lonicera involucrata Twinberry
Malus fusca West Coast crabapple
Malus sp. Apple
Morus Mulberry
Myrica pensylvanica Bayberry
Oemleria cerasiformis Osoberry
Philadelphus lewisii Mock orange
Prunus avium Cherry
Prunus domestica Plum
Pyrus pyrifolia Asian pear
Ribes sanguineum Red-flowering currant
Ribes divaricatum Black gooseberry*
Ribes nigrum Black currant*
Rosa nutkana Nootka rose
Salix fluviatilis Columbia River willow*
Salix hookeriana Hooker’s willow*
Sambucus cerulea Blue elderberry*
Spiraea douglasii Western spiraea*
Vaccinium corymbosum Blueberry*
Vaccinium ovatum Evergreen huckleberry
Viburnum opulus Highbush cranberry
Sun-tolerant plants 25+ feet tall
Abies grandis Grand fir
Acer macrophyllum Bigleaf maple
Alnus rubra Red alder*
Arbutus menziesii Madrone
Asimina Pawpaw
Calocedrus decurrens Incense-cedar
Castanea Chestnut
Chrysolepis chrysophylla Golden chinkapin
Diospyros virginiana Persimmon
Fraxinus latifolia Oregon ash*
Juglans regia English walnut
Picea species Spruce
Pinus ponderosa Ponderosa pine
Populus trichocarpa Black cottonwood
Prunus subcordata Klamath plum*
Pseudotsuga menziesii Douglas-fir
Quercus garryana Oregon white oak
Robinia pseudoacacia Black locust
Thuja plicata Western redcedar
Groundcovers
Fragaria chiloensis Strawberry
Gaultheria shallon Salal
Mahonia nervosa Oregon grape
Polystichum munitum Sword fern
Vaccinium vitis idaea Lingonberry
Vines
Lonicera Honeysuckle
Akebia Five-fingered akebia*
Plants for pond edges
Typha latifolia Cattail*
Ledum glandulosum Labrador tea
Plants that tolerate shade
Chrysolepis chrysophylla Golden chinkapin
Cornus nuttallii Western flowering dogwood*
Corylus cornuta Hazel*
Physocarpus capitatus Ninebark
Polystichum munitum Sword fern
Sambucus racemosa Red elderberry*
Prunus virginiana Chokecherry
Plants for partial shade to shade
Acer circinatum Vine maple *
Amelanchier alnifolia Serviceberry
Berberis aquifolium Oregon grape
Gaultheria shallon Salal
Cornus stolonifera Red-osier dogwood
Holodiscus discolor Oceanspray
Lonicera involucrata Twinberry
Oemleria cerasiformis Indian plum
Philadelphus lewisii Mock orange
Rhamnus purshiana Cascara sagrada
Taxus brevifolia Western yew*
Vaccinium ovatum Evergreen huckleberry
Edge plantings
Achillea millefolium Yarrow
Arctostaphylos uva-ursi Kinnikinnick
Berberis nervosa Cascade Oregon grape
Calendula officinalis Calendula
Cichorium intybus Chicory
Foeniculum vulgare Fennel
Fragaria chiloensis Wild strawberry
Gaultheria shallon Salal
Lavandula angustifolia English lavender
Medicago sativa Alfalfa
Nuts
Carya illinoinensis Northern pecans
Carya ovata Shagbark hickory
Castanea Chestnuts
Ginkgo biloba Gingko
Juglans ailantifolia Heartnut
Juglans regia English Walnut
Xanthoceras sorbifolium Yellowhorn
Plants for arid environments
Plantings around vineyards
Some flowering plants attract specific kinds of beneficials, for example, carnivorous flies (Oregon sunshine), predatory bugs (stinging nettle) and Anagrus wasps (sagebrush). Research shows trends of reduced pest abundance and increased beneficial insect diversity and abundance in vineyards with a diversity of native flowering plants compared to vineyards lacking native plants.
Incentive programs to help with hedgerow establishment
Conservation Reserve Enhancement Program
In exchange for removing environmentally sensitive land from production and establishing permanent resource-conserving plant species, farmers and ranchers are paid an annual rental rate along with other federal and state incentives. This program is administered through the USDA Farm Service Agency and local Soil and Water Conservation districts.
Environmental Quality Incentives Program
This program provides financial and technical assistance to agricultural producers in order to address natural resource concerns and deliver environmental benefits such as improved water and air quality, conserved ground and surface water, reduced soil erosion and sedimentation or improved or created wildlife habitat. The program is administered through the USDA Natural Resources Conservation Service via local field offices.
Guard, J.B. Wetland Plants of Oregon and Washington. 2010. Lone Pine Publishing.
Imhoff, D. and R. Carra. Farming With The Wild: Enhancing Biodiversity on Farms and Ranches. 2011. Sierra Club Books.
Kruckenberg, A. Gardening With Natives of the Pacific Northwest. 1982. University of Washington Press.
Lee-Mäder, E., J. Hopwood, M. Vaughan, S. Hoffman Black and L. Morandin. Farming with Native Beneficial Insects: Ecological Pest Control Solutions. 2014. Storey Publishing.
Link, R. Landscaping for Wildlife in the Pacific Northwest. 1999. University of Washington Press,
Mader, E., M. Shepherd, M. Vaughan, S. Black, G. LeBuhn, Attracting Native Pollinators. 2011. The Xerces Society for Invertebrate Conservation.
Martin, A., H.S. Zim, A.L. Nelson. American Wildlife and Plants: A Guide To Wildlife Food Habits. 1951. Dover Publications.
Pendergrass, K., M. Vaughan and J. Williams. Plants for Pollinators in Oregon.2007. USDA Natural Resources Conservation Service and The Xerces Society for Invertebrate Conservation,
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