The role of grazing animals in heathland management

Why heathland needs grazing

Lowland heathland is one of Britain's rarest habitats — a landscape of heather, gorse, and open ground that supports adders, nightjars, silver-studded blue butterflies, and a host of specialist plants. But heathland is not a natural climax community. It is the product of centuries of grazing, cutting, and burning by people. Without management, birch and pine scrub quickly take hold, bracken spreads, and the open character disappears. Grazing animals are the most efficient and natural tool we have for keeping that openness.

Cattle, sheep, and ponies: different animals, different jobs

Each species grazes differently, and that matters.

• Cattle are bulk grazers. They pull at coarse grasses like purple moor-grass and wavy hair-grass, and their hooves break up matted litter. Breeds such as Belted Galloway, Highland, and British White are hardy enough to stay out year-round on many sites.
• Sheep nip closer to the ground and are excellent at controlling scrub seedlings — birch, pine, and gorse. They also graze heather tips in winter, which can help maintain a mosaic of ages.
• Ponies — particularly Exmoor and Dartmoor — are selective grazers. They create patches of short turf and bare ground, and they will browse gorse and birch where larger animals struggle.

A mix of species is usually best, because each one leaves different vegetation structures behind.

What good grazing actually achieves

The goal is not a uniform sward. It is a patchwork: short grazed lawns, taller heather, scattered scrub, and bare ground. That variety is what rare invertebrates and reptiles need.

• Grazing controls scrub encroachment without the need for heavy machinery or herbicide.
• Dung supports invertebrates such as dung beetles and flies, which in turn feed birds and bats.
• Trampling creates bare ground for basking reptiles and for plants like shepherd's cistus and silver-studded blue butterflies, which need short, warm turf.
• Grazing keeps purple moor-grass and bracken in check, allowing heather to regenerate.

Matching animals to the site and the season

There is no single prescription. Stocking rates depend on the site's history, soil, and size. On a typical lowland heath, a rough starting point might be one cow per hectare for a short grazing period, or one pony per two hectares, but this varies enormously with vegetation and ground conditions.

Timing matters too:

• Spring: livestock are often moved onto heath to graze new growth and check scrub seedlings. Keep an eye on ground-nesting birds.
• Summer: lighter grazing or a move to different compartments helps maintain flower-rich patches for insects.
• Autumn: prime time for grazing bracken and coarse grasses before they collapse.
• Winter: hardy cattle and ponies can stay out, breaking up litter and creating bare patches for next year's seedlings.

Winter grazing is often easiest because livestock can be out-wintered without damaging wet ground too much. Summer grazing can be useful for scrub control, but care is needed to avoid disturbing nesting birds.

Making it work in practice

Grazing is not a case of turning animals out and walking away. It needs good fencing, a reliable water supply, and regular checks. Stocking levels should be adjusted based on what you see: if heather is being grazed too hard, reduce numbers; if scrub is gaining ground, increase pressure or bring in a different species.

It also helps to work with neighbours and local graziers. Many conservation graziers run small herds and are happy to tailor grazing to a site's needs. Recording what you see — a simple photo point or a fixed transect — will tell you more than any textbook.

Why this matters beyond the heath

Heathland grazing supports a whole web of life. Nightjars need open ground for nesting; sand lizards need bare patches; silver-studded blue butterflies need short heather and ants. The animals doing the grazing are part of that web, not separate from it.

Keeping grazing animals on the heath is also a way of keeping traditional skills and hardy breeds alive. It connects conservation with farming, and it produces good food from land that might otherwise be lost to scrub.

For anyone managing a heath — whether a large reserve or a small common — the message is simple: grazing works. It is cheap, it is effective, and it creates the kind of messy, varied landscape that British wildlife depends on.