Why a deadwood pile deserves a corner of your garden

Deadwood is one of the most undervalued habitats in Britain. A standing oak may live for 400 years, but much of its ecological work begins when it falls. Rotting timber supports beetles, fungi, centipedes, millipedes, woodlice and hoverflies, plus the birds and hedgehogs that feed on them. In a tidy garden most of this is swept, chipped and burned. Leaving one stack of logs in a quiet corner is among the cheapest, kindest things you can do for wildlife — and it needs no skill and no money.

Choose a shady, undisturbed spot

Decomposers need steady moisture, which means shade. Full sun bakes and dries a log pile, and dry wood rots far more slowly. A north- or east-facing corner, the dappled shade under a deciduous tree, or the cool side of a shed all work well. Keep it a couple of metres clear of the house to avoid damp, and away from doors and paths so that any nesting bees are not a nuisance.

• Shade: dappled or full shade; avoid south-facing sites in baking sun.
• Damp but drained: soil that stays cool and moist without sitting waterlogged for weeks on end.
• Ground contact: logs resting on soil or leaf litter rot far better than those on paving or gravel. On hard standing, lay soil or woodchip down first.

Gather the right wood

Variety matters. Different fungi and beetles specialise in different timbers, so mix species and sizes rather than stacking one uniform load.

• Native broadleaves: oak, beech, ash, birch, willow, cherry and apple are all excellent.
• Mix the diameters: from wrist-thick branches to logs 20–30 cm across. Big logs hold moisture for years, which is just what stag beetle larvae need.
• Leave the bark on. It is food and shelter in its own right.
• Avoid treated, painted or creosoted timber, and any wood you cannot identify. Skip imported pallets unless you know they are heat-treated.
• Conifer is fine in small amounts, but it rots faster and supports fewer species, so keep it a minor part of the mix.

Stack it loosely and bury the base

The most important trick is partial burial. Stag beetle larvae feed underground, in wood that stays damp all year, and they need logs with soil contact and a little depth. Push a few logs a third of the way into the soil, or build directly on the ground and let the bottom layer sink in over time.

• Aim for about a metre high and a metre across, if you have the wood. Even a modest bundle helps.
• Leave gaps. Cramming logs together squeezes out the air and damp that invertebrates need. Rest them crosswise and let the pile look untidy.
• Tuck leaf litter, twigs and a little soil into the gaps to help fungi and beetle larvae get started.
• Stand one or two logs upright, part-buried, to bring damp wood into contact with the air. Solitary bees and wasps love these.

What moves in, and when

Fungi usually arrive first — sulphur tuft, jelly ear, candle snuff, brittlegills and slime moulds — spreading mycelium through the wood and softening it for everything else. Woodlice, millipedes and centipedes follow, along with beetles and their larvae. Slow worms, frogs and hedgehogs may shelter in the pile, while wrens and robins hunt through it.

Stag beetles are the prize, but they are slow: larvae spend three to seven years in rotting wood before emerging as adults in early summer, and they are largely confined to southern England. Even if they never find your pile, you will still be supporting lesser stag beetles, click beetles, hoverfly larvae and a fungal community that no mown lawn can match.

Looking after it over the years

Once built, the best thing you can do is largely ignore it. Do not turn it, move it or tidy it, and resist the spring clean-up. Disturbance in autumn and winter is especially damaging, when many creatures are hibernating inside.

• Top up each autumn with fresh logs and prunings, adding them on top or at the side rather than replacing what is already there.
• Keep it damp in long dry spells; a gentle soak during a drought keeps the fungi working.
• Leave fallen leaves around the base — they are part of the habitat.
• Be patient. Fungi appear within a year, beetles within two or three, and the pile keeps improving for a decade as it collapses slowly into soil.

If you have room, do not stop at one pile. A second stack in a different spot, some standing deadwood in a border and a patch of long grass nearby will turn a single gesture into a proper little nature reserve at the bottom of the garden.