What Actually Counts as Heathland

Heathland is often mistaken for rough, unkempt ground. In truth it is one of Britain's most distinctive habitats, defined by dwarf shrubs growing on acidic, nutrient-poor soils. In the lowlands those soils are sandy or gravelly; in upland fringes they turn peaty and waterlogged. What they share is a shortage of nutrients that would otherwise let trees and vigorous grasses take over.

The three heathers give the habitat its identity: ling (Calluna vulgaris), bell heather (Erica cinerea) and cross-leaved heath (Erica tetralix). Add gorse, bristle bent, purple moor-grass and wavy hair-grass and you have the framework. None of it is natural in the strict sense. Heathland is a cultural landscape, kept open for centuries by grazing, cutting, turf-stripping and controlled burning. Stop those activities and birch, pine and bracken move in within a generation.

Dry Heath: The Purple Uplands and Sandy Commons

Dry heath develops on free-draining sands and gravels, usually on slopes, ridges and old river terraces. Ling dominates, growing in distinct phases: pioneer, building, mature and degenerate. That structure matters enormously. Nesting birds need tall, dense mature stands; basking reptiles need short, open patches and exposed sand between them. A tidy heath with uniform heather is a poor heath.

Its specialities are genuinely rare. The sand lizard and smooth snake survive in Britain almost entirely on southern dry heaths. Nightjars churr from dusk in June and July, and the Dartford warbler — all but wiped out in the 1960s — has recovered strongly in gorse stands. Among invertebrates, the silver-studded blue butterfly depends on ants to rear its larvae, and emperor moth caterpillars feed on heather and bramble.

Wet Heath and Valley Mires: The Soggy Half

Where water gathers and drainage is impeded, the character of the habitat changes completely. Peat forms, sphagnum mosses carpet the ground, and the vegetation shifts to cross-leaved heath, purple moor-grass, cottongrass, bog asphodel and, in the best sites, round-leaved sundew, which catches insects to supplement its meagre diet. Valley mires are the finest expression of this, and the New Forest and parts of Dorset hold internationally important examples.

Wet heath is disproportionately rich in wildlife. The southern damselfly, a European rarity, needs shallow, flowing, base-poor runnels. The large marsh grasshopper is now effectively confined to a handful of southern mires. Curlew and snipe nest here, and hobbies hunt dragonflies over the pools on summer evenings. Sphagnum is the engine of the whole system: it holds water, builds peat and locks away carbon, but only while it stays wet. Drainage or prolonged drought can undo decades of accumulation.

Acid Grassland: The Overlooked Third

The third element is acid grassland, routinely ignored by visitors. Look for wavy hair-grass, sheep's fescue, common bent, mat-grass, tormentil and heath bedstraw — a low, fine-leaved sward with a mossy underlayer, usually on shallower soils between heath blocks.

It is not a poor relation. Acid grassland supports the field cricket, reintroduced to a few heathland sites after decades of decline, along with butterflies such as the grayling. In practice, dry heath, wet heath and acid grassland intergrade across a site in a shifting mosaic, and most heathland species use more than one element. The transitions are where the interest lies.

Why Management Is Not Optional

Without intervention, heathland closes over. The traditional tools remain the best ones:

• Grazing by ponies, cattle or sheep, which creates a mix of short turf, taller scrub and bare ground, and supplies dung for insects.
• Rotational burning on dry heath only, in small, cool strips, never on deep peat, where fire destroys the substrate itself.
• Cutting and mowing to remove rank growth and litter, mimicking the old practice of harvesting heather and turf.
• Scrub and bracken control to stop trees and dense ferns swallowing open ground.

Bare ground is the most undervalued feature of all. Solitary bees and wasps nest in it, reptiles bask on it, and many invertebrates need warm, exposed sand. A good heath is patchy by design.

Reading a Heath on Foot

Give yourself the best chance of seeing things. Visit between late June and early September, when life is at its peak, and go early or late in the day — nightjars and reptiles are far more visible at the edges of the day than at noon. Wear boots that cope with wet peat, and keep dogs on leads from March to July, when ground-nesting birds and young reptiles are vulnerable.

Stay on main paths where you can. Heaths are easily damaged: eroded tracks, disturbed lichen communities and trampled bog take a long time to recover. Learn to tell the three heathers apart — ling flowers late, in pinks and purples; bell heather flowers earlier, in deep magenta; cross-leaved heath has grey-green leaves in four neat ranks and grows in the wetter spots. Once you can read the shrubs, you can begin to predict what lives nearby.