Wild Slow Worm Conservation in Garden Habitats

Slow worms are legless lizards that thrive in garden habitats and are protected under UK law, with garden management playing a significant role in their welfare and population viability.

Key Facts

Slow worms are lizards, not snakes — they have eyelids, smooth shiny scales, and can shed their tail as a defence mechanism
They are fully protected under the Wildlife and Countryside Act 1981 — killing or injuring them is illegal
Slow worms thrive under corrugated iron sheets, log piles, and compost heaps that provide warmth and invertebrate prey
They feed primarily on slugs, making them highly beneficial to gardeners
Habitat loss from strimming, tidying garden edges, and chemical slug control reduces slow worm populations
Female slow worms give birth to live young in late summer — disturbance during this period can cause abortion

Welfare Considerations

Slow worm welfare in gardens is most threatened by accidental injury during strimming and mowing, deliberate killing from misidentification as snakes, and loss of refugia from overly tidy garden management. Strimming injuries cause severe traumatic wounds and death; checking refugia before mowing and using a high cut setting significantly reduces accidental mortality. Deliberate killing from snake fear causes direct welfare harm to a protected, entirely harmless species. Providing artificial refugia — corrugated iron basking sheets, log piles, compost heaps — in gardens supports slow worm populations while providing gardeners with effective natural slug control. Chemical slug pellet use reduces the invertebrate prey base that slow worms depend upon.

What You Can Do

Check under corrugated iron sheets, logs, and in compost heaps before gardening or mowing to avoid injuring sheltering slow worms
Install a refugia sheet (corrugated iron or roofing felt on the soil surface) in a warm, sheltered area to attract slow worms
Avoid chemical slug control — slow worms are highly effective natural slug predators and slug pellets eliminate their prey base
Share slow worm sightings with local Wildlife Trust recording schemes to contribute to population monitoring