How to Encourage Dormice in Managed Woodland

Why dormice need a helping hand

Britain's hazel dormouse is a shy, nocturnal woodland specialist. It spends most of its life in the branches, rarely crossing open ground, and it has declined sharply as woodlands have become fragmented and scrubbed over. The good news is that a well-managed coppice can be excellent dormouse habitat. The species needs three things above all: dense undergrowth for nesting, connected tree canopies for safe travel, and a reliable food supply through the seasons. Coppicing, hedgerow management and a little strategic neglect can all help.

Keep the understorey dense and scrubby

Dormice are vulnerable on the ground, so they avoid woods with a bare, grazed or shaded floor. They want a tangled, thorny, sunny understorey. Bramble is especially valuable, along with honeysuckle, hazel, blackthorn, hawthorn and young oak. Aim for at least a third of the wood to be in dense scrub, young coppice or bramble at any one time. Practical ways to build that structure include:

• Coppice in small coupes rather than clearing large areas.
• Leave bramble patches to grow, especially along sunny ride edges.
• Retain some standards and shrubby trees through each rotation.
• Create scalloped edges and wide, graded rides that let light reach the floor.
• Pile brash and deadwood rather than burning it, as these make useful nesting and hibernation sites.

Fence sensitive coppice coupes if grazing is part of your management.

Connect the canopy into a green highway

Dormice travel through branches, not across fields. A gap of just a few metres can be a barrier. Manage your wood as part of a wider network: hedgerows, ride edges, shelterbelts and neighbouring woodlands all matter. Aim for continuous branches between roughly 2 m and 6 m above ground, where dormice feel safe. Useful steps include:

• Lay or coppice hedgerows on a long rotation, leaving some tall, fruiting stems.
• Plant hazel, hawthorn, honeysuckle and bramble to bridge gaps between coppice coupes.
• Leave standards and mature shrubs along ride edges so branches almost meet.
• Avoid flailing hedges down to bare stems; cut them on a three-year or longer cycle.
• Keep a few uncoppiced refuge areas next to newly cut coupes, so dormice can move sideways rather than cross open ground.

Food and flowers: hazel, honeysuckle and bramble

Dormice need a sequence of food from spring to autumn. Hazel nuts are the classic autumn staple, but they are not enough on their own. Honeysuckle flowers provide nectar in early summer, bramble flowers and berries follow, and oak, ash and sycamore aphids supply protein. Honeysuckle bark is also stripped for nesting material. To keep the larder full:

• Let some hazel stools grow tall and fruit before coppicing them.
• Use a long rotation of 15 to 25 years for hazel, and leave a few stools uncoppiced each time.
• Encourage honeysuckle in the understorey and along hedges; it flowers best with some light.
• Retain bramble and ivy, which offer late flowers and berries.
• Leave fallen nuts and deadwood in place rather than tidying them away.

Variety is key. A wood that offers only one or two food plants will support far fewer dormice than a mixed, structurally rich one.

Coppicing with dormice in mind

Coppicing is one of the best tools for dormouse conservation, but it must be done carefully. Dormice are legally protected in the UK, and it is an offence to disturb them or damage a nest or resting place. Traditional winter coppicing avoids the main breeding season, but dormice may be hibernating in leaf litter or at the base of stools, so check carefully before cutting. If you find a nest or a dormouse, stop work and seek advice from a licensed ecologist.

• Cut one coupe at a time, ideally no more than a fifth of the wood in any year.
• Use a rotation of at least 15 to 20 years, longer where dormice are known to be present.
• Retain standards, mature shrubs and some uncoppiced hazel stools in every coupe.
• Check stools, leaf litter and brash piles for hibernating dormice before felling.
• Avoid coppicing between April and October if you can, as this is the breeding and active season.
• Leave cut brash in loose piles and keep some deadwood standing or on the ground.

Work with neighbouring landowners where possible. A single wood managed well is good; a connected cluster of woods managed on different rotations is far better.

Signs to look for and when to pause

Learn the field signs. Hazel nuts eaten by dormice have a neat, round hole with tooth marks around the rim. Look for woven honeysuckle bark nests in dense shrubs, and for small, flimsy summer nests in bramble. Dormouse tubes and nest boxes can help you monitor, but only handle them if you are licensed or working under supervision. If you find dormice, record what you see and adjust your plans: leave that coupe for another year, widen a ride, or retain more bramble.

Dormice are slow breeders, usually raising just one litter a year, so populations recover slowly. Patience, continuity and a light touch are more valuable than any single intervention. By keeping the understorey dense, linking the canopy, providing hazel, honeysuckle and bramble, and coppicing in small, checked stages, you can make your wood a genuine refuge for one of Britain's most charming and elusive mammals.