Dartmoor is famous for is diverse landscapes, many of which which sit on top of one of the largest granite areas in the country.   There are wet heaths, dry heaths, oak woodlands and blanket bogs.  The oak woodlands contribute massively to biological diversity of the area as the trees are covered with rich flora of mosses, liverworts and lichens. The SW area often experiences strong winds and has acidic soils.  The biodiversity of the area explains why it has been designated as a Special Area of Conservation.  It is one of our National Parks, which attracts many thousands of visitors.  A ‘normal‘ feature of heath and moorland is swathes of heather.   Due to its tolerance of acidic conditions and relative infertility, heather is generally a prominent member of the local flora.  This was once true of the moorland communities on Dartmoor, but the situation is changing. The change is due to a grass - known as purple moor grass (Molinia caerulea). Molinia is native to the UK but is also found in Europe, Asia and parts of Africa. It grows well on acid soils with a pH between 3.5 and 5, and it too can tolerate poor soils. During of the last 50 years,  Molinia has spread extensively in Dartmoor, Exmoor, the Pennines, the Peak District, the Yorkshire Dales and  parts of Wales.  Sadly, areas of purple moor grass support little in terms of insect or indeed bird life.  Herbivores like sheep and cattle tend to avoid it preferring other sources of vegetation, such as heather.  Indeed its nutritional value is not great and actually falls as summer progresses.  The grass is relatively unaffected by fungal / bacterial disease.  It forms deep roots and tussocks, which help protect its buds. The cover of heather on Dartmoor has fallen substantially in recent times, and in places has been replaced by an expanse of purple moor grass.  The features that made Dartmoor special are being lost. Possible factors contributing to changes on the moor: The practice of burning the moorland to encourage fresh shoots for sheep, cows, livestock.  Fires destroys many species but the young shoots of Molinia are ‘protected’ to a degree within the tussocks, and the deep roots also help ensure survival. Nitrogen deposition may be another factor.   A range of nitrogen compounds from farming (fertilisers, animal waste), traffic emissions and industry are released into the atmosphere and are deposited in significant amounts (circa 29 kg per hectare / year). Changes to moorland drainage.  As peat dries, the purple moor grass seems to thrive. There are limited funds available to the National Park for maintenance / repair. The subsidies (termed Headage payments) paid to farmers for the number of animals that graze on the moor. The combined effect of the above means that the moorland ecosystem is struggling, losing its integrity and climate changes (e.g. hotter, drier summers) do not help.   Essentially, the moorland is dying. There are places where the natural vegetation / flora of heather, bilberry and mountain ash are to be found, which suggests that restoration might be possible. What can be done? Create dams and embankments to retain water so that areas become wetter, and plant clumps of the moss - Sphagnum, which is vital for peat formation.  The water / wetness would also help reduce the risk of fire. Plant trees, like those found in woodland areas of the moor, which once established would tend to shade out the purple moor grass. Reducing the grazing pressure on the moorlands. Further reading https://www.theguardian.com/environment/2025/jul/16/dartmoor-is-dying-how-the-uks-national-parks-turned-into-biodiversity-deserts https://www.theguardian.com/commentisfree/2025/jul/15/sheep-destroying-british-habitats-taxpayers-dartmoor-farming https://dartmoorpreservation.co.uk/is-dartmoor-dying/

Scotland’s west coast has a number of temperate rain woodlands / forests. They are quite rare. The remnants of oak, birch, ash, native pine and hazel woodlands are small and isolated from each other. They are noteworthy for the diversity and richness of the bryophytes (mosses and liverworts) and lichens; found in abundance on the trees, rocks and on the ground.   Sadly, such woodlands have been in decline for some time. In the past, this woodland covered large areas of the west coast of Scotland, but much has been lost over the last two thousand years.  These woodlands / forests now cover a small area, just under 5% of the land. Factors that have contributed to the decline and loss of this woodland include:- mismanagement,  overgrazing by sheep and  invasion by non-native species [such as Rhododendron ponticum]. According to recent study by Scottish Environment LINK, deer now represent a considerable threat to the woodlands.  Whilst deer are part of woodland ecosystems, when their numbers increase beyond a certain point then they become a significant problem.  Deer numbers are now at historic highs in Scotland/  Money has been made available to manage surging deer populations, for example, through the provision of deer fencing.  However, the report considers that such fencing is “both expensive and often ultimately ineffective”.  More needs to be done if deer damage is to be reduced and allow regeneration of the woodlands. Developing a community approach to deer stalking and management will be important, combined with the use of technologies such as thermal and drone surveying. A greater focus on the management of roe and sika deer, combined with the removal of Rhododendron ponticum will be needed if the woodlands are to flourish and expand. see also : https://www.thescottishfarmer.co.uk/news/23637346.soaring-deer-numbers-see-new-powers-land-managers/   [caption id="attachment_39688" align="aligncenter" width="675"] Rhododendron ponticum, these plants were growing near the River Tay.[/caption] visit https://www.instagram.com/woodlands.co.uk/?hl=en  

Perhaps it all started with a "No-shave November" (or "Movember") when men realised that they could go for a month without shaving and no one would mind.  It may also have been good for them as they thought more about men's health and they let nature take its course.  A few years later people started wondering about other habitual cutting, such as mowing their lawns religiously.  "No Mow May" was invented in 2019 by Plantlife with the idea that less cutting of grass would allow wildflowers to flourish.  The official reason for this concession to conservation was to allow the wild flowers and pollinators to thrive, but it may also have become popular because it allows maintenance teams to work a bit less hard during May.  In any event it's now so popular that about 36% of lawn owners now join in every year.  But it's spilled over well beyond just the month of May - many owners of lawns have questioned whether they really want so much short grass when alternatives are more interesting - and better for wildlife.  Even at the 2022 Chelsea Flower show there were several gardens demonstrating rewilding. So rethinking the scorched earth policy has now spread from men's chins to gardens and parks - but will it spread further?  What about our hillsides? For eighty years we have been intensively grazing these with sheep and cattle as if our lives depended on it - which maybe they did in 1942, when war-time convoys of food from the US were being torpedoed.  Even after grazing ceased to be a necessity sheep continued to dominate our hillsides with grants to sheep farmers making it profitable to use their four-legged lawnmowers at scale.  Farmers even grubbed out hedges in the 1970s, described by Oliver Rackham as the locust years, which made the countryside look even neater and tidier.  According to DEFRA there are currently about 32 million sheep in the UK, a third of them in Wales.  Land used for rough grazing and grassland makes up about 50% of the UK's total land area.  So for several generations now the UK has used half of its land to raise animals for eating, but times are changing rapidly.  Whereas those with meat-free diets used to be a tiny minority their numbers are growing rapidly - already at least 14% of the population is meat-free and for those of university age (18-23) the number is up to 25%, and rising. The combination of reduced demand for meat and increasing awareness that we can happily stop cutting the grass is prompting a rethink of how we use the British countryside.  Much of the grazing land is not suitable for growing agricultural crops so that leaves owners wondering what to do with their land.  Some are choosing rewilding in various ways but usually with far fewer grazing animals, longer grass and more wildflowers. [caption id="attachment_38426" align="aligncenter" width="600"] 'rewilding' of roadsides and verges[/caption] Others are planting trees and creating new woodlands.  Where the land is sold it's often to people who want to plant trees or simply to fence out sheep and allow "natural regeneration" allowing trees to self-select and grow on their own.  It's an appealing project for many families to take on 5 acres of grazing land, plant trees and convert it into a wood of their own. This re-evaluation of how grazing land is used is happening right across the world as plant based diets become more popular and there is potential to re-establish wilder habitats.  It's good for carbon emissions - not only because woodland fixes carbon but also because rewilding cuts the number of grazing animals releasing methane: belching by sheep and cattle creates a third of the total emissions of UK agriculture. Despite this, there may be resistance from the powerful National Union of Farmers which mostly represents bigger farmers and which promotes farming as an industry.  Farmers already complain about reductions in headcounts of livestock - since the peak in 1992, sheep headcount is down by about a third.  But it's also about the way the grant system is structured - millions of sheep only exist because of the farm payments, financed by taxpayers, and the condition of receiving these annual grants is that "unwanted" vegetation and wild plants have to be removed.  So even if the sheep don't chomp up biodiversity the farmers have to do it to get their grants. [caption id="attachment_21282" align="aligncenter" width="600"] Sheep grazing around solar array[/caption] Even beyond this suppression of diversity, sheep and cattle are damaging in many other ways such as compacting the soil which contributes to flooding and droughts. Meanwhile the number of men keeping their beards after no-shave November has increased and there are more gardens and parks with wild meadows so maybe the much bigger revolution in rural land use might follow. Governments have had it within their power for decades to reform the grant system but real change may be driven by people's behaviour - eating less meat and planting up their own woodlands.

Some ten to fifteen million years ago, Iceland supported forests and woodlands of Redwoods (Sequoia), Magnolia and Sassafras.   The presence of such species suggests that at this time the climate was warm and temperate.  Later, in the Pliocene period, evidence from pollen studies, suggest that Pines, Larch, Birch and Alder had come to dominate; species that are associated with Boreal Forest - so the climate had cooled considerably. There then followed the glaciations of the Pleistocene (often simply referred to as the Ice Age) - a geological epoch which lasted from about 2,500,000 to 12,000 years ago.  Glaciers marched across the surface of the Earth, but retreated in the warmer inter-glacial periods. Read more...