Creating a dead hedge: Building a wildlife habitat in your garden

The most important points in brief

• A dead hedge serves as a permanent food source and a protected retreat for insects, amphibians, and small mammals.
• It is constructed by layering pruned wood between sturdy posts, without the need for external materials.
• It promotes the nutrient cycle directly on-site and replaces artificial boundaries with a dynamic ecosystem.

The ecological function of a dead hedge

A dead hedge, often known as a Benjes hedge, is more than just a simple barrier. It acts as a structurally rich habitat that supports a high density of specialised organisms through the natural decomposition process of wood. During the rotting phase, this provides a habitat for egg-laying, particularly for beetle species such as the lesser stag beetle (Dorcus parallelipipedus) or various longhorn beetles (Cerambycidae). The hedgehog (Erinaceus europaeus) also uses the layered cavities as a safe place to hibernate. By not disposing of garden trimmings, nutrients are kept within the garden cycle.

Step-by-step to a wildlife habitat

1. Location choice and preparation: Choose a sunny to semi-shaded spot. Do not remove the turf; simply place the hedge directly onto the ground.
2. Structuring posts: Drive two parallel rows of robust posts into the ground about one metre apart (preferably using sweet chestnut (Castanea sativa) or oak (Quercus robur), as these are weather-resistant). The distance between the rows should be about 50 to 80 centimetres.
3. Layering the material: Begin with coarse branch material on the ground. Layer the material loosely. Take care not to include damp, soft plant matter such as lawn clippings in the centre, as this encourages rotting.
4. Compaction: Occasionally press the wood down with your foot to keep the hedge stable. A height of 1.20 to 1.50 metres is ideal for providing sufficient volume for small mammals.
5. Edge planting: Plant native shrubs such as common hawthorn (Crataegus monogyna) along the outer edges. These ecologically complement the dead wood by providing nectar and fruit.

Why avoid chemical products?

The dead hedge is a closed system. The use of pesticides or synthetic fertilisers disrupts the colonisation of decomposers—the organisms that break down organic matter. To promote biodiversity, it is essential to leave the dead wood alone mechanically. "Tidying up" or "cleaning" stops the natural succession (the chronological sequence of biological communities in a habitat).

Frequently asked questions

Can I also use coniferous wood?

Yes, but mix it in. Coniferous wood rots more slowly and is well-suited as a supplement to hardwood to provide structure for fauna.

How long does a dead hedge last?

By consistently adding fresh trimmings, its lifespan is theoretically unlimited. The material at the bottom slowly rots down into valuable humus.

Does a dead hedge attract pests?

No. It encourages beneficial insects like ground beetles and birds, which maintain an ecological balance and prevent mass infestations.

Main article: Nature gardens in an allotment: Step by step towards biodiversity