Why decaying wood is a wildlife magnet

A log pile is one of the simplest, most generous things you can add to a British garden. Dead wood is not rubbish — it is a larder, a nursery and a winter shelter all at once. As fungi and bacteria break it down, they unlock nutrients that feed beetles and their larvae, which in turn feed birds, frogs and shrews. The slowly rotting timber also enriches the soil beneath it, so the patch you leave messy today becomes richer ground tomorrow.

Unlike a plastic bug hotel or a tidy stack of bricks, a log pile mimics what happens naturally in a wood: a branch falls, moss grows, damp gathers, and life moves in. It costs nothing but a little space and a decision not to tidy up.

Picking the right spot

Shade is the single most important factor. A pile in full sun will dry out quickly and become useless to the creatures you are trying to help. Look for a north- or east-facing corner, under a deciduous shrub, behind a shed, or along a hedgerow. Damp, cool and quiet is the goal.

A spot near a pond, a boggy border or a downpipe is perfect for amphibians, which need moisture to keep their skin from drying out. Keep the pile at least 30 centimetres from a house wall so damp does not creep into brickwork, and avoid placing it on a hard surface — bare soil is far better, because logs can settle into it and stay wet.

Building the pile: what to use and how

Gather untreated wood. Oak, beech, ash, birch, apple and cherry are all excellent, and fruit wood rots beautifully. Avoid timber that has been treated with preservative, painted, varnished, or made from MDF or plywood. These can leach chemicals into the soil and harm the very wildlife you are inviting.

Variety is key. Mix thick logs of 10 to 20 centimetres across with thinner branches and twigs. Leave the bark on, as many beetles lay eggs beneath it. Partly bury the bottom layer in the soil so it stays damp and gives fungi a foothold.

• Lay the largest logs horizontally at the base, pressing them into the ground.
• Stack smaller logs and branches on top at angles, leaving gaps and crevices.
• Add two or three upright stumps, about 30 to 50 centimetres tall.
• Tuck leaf litter, woodchip and a little soil into the gaps.
• Drill a few 8 to 10 millimetre holes into the upright stumps for solitary bees.

A pile roughly a metre long and half a metre high is plenty for most gardens, but even a small stack in a corner will be used. There is no wrong size.

What will move in, and when

Beetles and woodlice are usually first on the scene. Stag beetle larvae, which are now rare in Britain, can spend up to seven years inside rotting wood before emerging. Ground beetles, rove beetles, centipedes and millipedes will follow, along with fungi, moss and ferns.

Frogs and toads are drawn to the damp shelter, and smooth and palmate newts may use it as a daytime retreat between trips to a pond. Slow worms often bask on the top in the early morning before sliding back into the cool. Hedgehogs may nest in a large pile, and solitary bees will use the drilled holes.

Be patient. A new pile takes a year or two to become fully alive. The more undisturbed it is, the richer it becomes.

Keeping it damp and undisturbed

Damp is the difference between a lifeless stack and a thriving habitat. In dry spells, trickle rainwater over the pile rather than tap water, which contains chlorine. Each autumn, let fallen leaves gather around and over it. Top up with fresh logs as the old ones crumble, but do not turn or rebuild the pile. Frogs and newts return to the same sheltered spots year after year, and disturbance can kill the larvae and eggs hidden inside.

If cats visit your garden, lay a few prickly branches around the base. Keep the area free of slug pellets and pesticides, which travel up the food chain. And resist the urge to tidy: a wild, slightly scruffy corner is exactly what the wildlife needs.

A few final touches that make a difference

• Put a shallow dish of water nearby, with a stone or sloping edge so creatures can climb out.
• Leave a patch of long grass and leaf litter next to the pile.
• Plant shade-loving natives such as ferns, wood anemone or wild garlic around it.
• Link the pile to a hedge, compost heap or pond to create a wildlife corridor.
• Add a few hollow stems or a bundle of twigs for extra nooks.

Sit quietly nearby at dusk in spring or early summer, and you may see a frog hop out from between the logs or a bat swoop overhead. A log pile asks for so little and gives back so much — to beetles, to amphibians, and to the soil that feeds everything else in your garden.