Why a log pile deserves a corner of your garden

Dead wood is one of the scarcest habitats in modern Britain. We tidy it away, burn it, chip it, or stack it neatly for the woodburner, and in doing so we quietly remove a whole ecosystem. A rotting log is not waste; it is a slow-release larder and a winter hotel rolled into one.

Around a third of woodland invertebrates depend on dead or dying wood at some stage of their lives. Add fungi, mosses, amphibians and solitary bees to that list and a modest pile in a quiet corner starts to look like very good value. It costs nothing, takes an afternoon, and improves with age. Unlike most garden projects, the less you do to it afterwards, the better it works.

Choosing the right spot

Think about moisture first. Rot needs damp, so a spot in part shade, ideally with a north or east-facing edge, will break down more slowly and stay more welcoming. A pile in full sun all day will dry out and support a narrower range of species, though it will suit solitary bees beautifully.

• Near a pond or damp border: frogs, toads and newts will use the pile as an overwintering refuge.
• Beside a hedge or under a shrub: shelter, leaf litter and shade in one.
• On bare soil rather than paving: ground beetles and stag beetle larvae need to burrow in beneath.
• Leave a 15cm gap from fence panels and sheds so you are not encouraging rot in your own structures.
• Somewhere you rarely walk: the whole point is that it stays undisturbed.

If you can manage two piles — one in shade, one in sun — you will double the range of wildlife that moves in.

Sourcing the wood

Untreated wood only. Anything painted, varnished, creosoted or pressure-treated with preservative has no place in a wildlife pile, and neither do chipboard, MDF or old pallets that may have been soaked in who-knows-what. Railway sleepers are another one to avoid.

Good candidates are oak, ash, beech, birch, sycamore, willow, apple, cherry and conifer. Hardwoods rot slowly and last for years; softwoods and conifers go soggy faster and are brilliant for fungi. A mix gives you both longevity and quick results.

• Aim for 5–30cm in diameter and cut into 30–60cm lengths.
• Leave the bark on. It shelters beetle larvae and holds moisture.
• Keep it local. Moving wood long distances risks spreading tree pests and diseases, so use what is already in your area.
• Ask a neighbour or a local tree surgeon for a barrowload of arisings.

How to build it

The temptation is to build a neat little wall. Resist it. A tight stack holds too little air, and air gaps are what beetles and bees actually use.

• Start with two or three logs half-buried in the soil — this is the bit that ground beetles, newts and stag beetle larvae will use.
• Stack loosely, alternating sizes so there are gaps of a couple of centimetres throughout.
• Stand a few logs upright on the sunny side. Drill 8–10mm holes about 10cm deep into the cut ends and you have an instant solitary bee nest for mason and leafcutter bees.
• Cap the height at 60–90cm. Taller piles collapse and take longer to colonise.
• Never cover it with plastic or a tarpaulin. A little rain is the point.
• Finish with leaf litter, a few stones and some dead stems tucked around the base.

One more thing: keep it away from where you might light a bonfire, and never treat it as firewood. Bonfire night is the single biggest killer of overwintering hedgehogs in British gardens.

What will turn up, and when

Fungi usually arrive first, often within a few months — jelly ear, candle snuff, various bracket fungi pushing out of the cut ends. Beetles follow: lesser stag beetles, click beetles, bark beetles and longhorns, all working the wood down into crumbly humus. That humus is then colonised by worms, millipedes and woodlice.

Over winter, the pile earns its keep. Frogs and toads burrow into the damp base, queen bumblebees and solitary bees tuck into holes and cracks, and hedgehogs, shrews and slow worms use the warmth and shelter. Come spring, wrens, robins and blackbirds will turn the pile over looking for the larvae underneath. If you live in the south-east of England, your pile may even be investigated by a female stag beetle.

Looking after it

A log pile is a low-maintenance feature, but not a no-maintenance one.

• Leave it alone. No tidying in autumn, no moving it in winter.
• Add one or two fresh logs each year as the older ones crumble, always stacking them loosely on top.
• Keep a little leaf litter around it so the base stays damp.
• Be patient. Year one is quiet. Year two brings beetles. By year four or five it will be one of the busiest corners of the garden.

Best of all, a log pile is a habitat you can build in an afternoon and then enjoy for a decade — a small, generous act that pays back in beetles, birdsong and the odd frog peering out from between the logs on a mild February morning.