Snails are often so abundant in gardens that some damage has to be tolerated. They cannot be eradicated so target control measures on protecting the more vulnerable plants, such as hostas, seedlings, vegetables and soft young shoots on herbaceous plants.
There are many preventive measures that have been used by gardeners to minimise snail damage. Most of these do not have any scientific evidence to prove that they are effective. These measures include:
- Transplanting sturdy plantlets grown on in pots, rather than young vulnerable seedlings. Transplants can be given some protection with cloches
- Torchlight searches on mild evenings, especially when the weather is damp; hand-picking snails into a container. They can then be taken to a field, hedgerow or patch of waste ground well away from gardens, or killed in the freezer before being added to the compost heap or put in the bin
- Some birds, frogs, toads, hedgehogs, slow-worms and ground beetles eat slugs and snails and these predators should be encouraged in gardens
- Raking over soil and removing fallen leaves during winter can allow birds to eat slug eggs that have been exposed
- Traps, such as scooped out half orange, grapefruit or melon skins, can be laid cut side down, or jars part-filled with beer and sunk into the soil near vulnerable plants. Check and empty these regularly, preferably every morning. Proprietary traps are also available from garden centres and mail order suppliers
- Barriers, thought to repel snails, include rough or sharp textured mulches and substances thought to be distasteful or strong smelling. Copper-base barriers have been shown to repel slugs in some studies. A recent RHS study in a garden-realistic scenario however, found no reduction in slug damage from barriers made of copper tape, bark mulch, eggshells, sharp grit or wool pellets
Most of these non-chemical control options have very little scientific research into them, but the RHS is hoping to address this knowledge gap and is carrying out a range of scientific studies.
The nematode biological control available to control slugs is unlikely to affect snails, as they rarely come into contact with the soil-dwelling nematodes.
Following the manufactures instructions scatter slug pellets thinly around vulnerable plants, such as seedlings, vegetables and young shoots on herbaceous plants. It is important store pellets safely and scatter them thinly as they can harm other wildlife, pets and young children if eaten in quantity.
There are two types of slug pellet approved for use in gardens, those based on metaldehyde and those based on ferric phosphate. Ferric phosphate based pellets are approved for use by organic growers. Products include Growing Success Advanced Slug Killer, Solabiol Garden Slug Killer, Vitax Slug Rid, Doff Super Slug Killer, Sluggo Slug & Snail Killer and SlugClear Ultra3. To protect children and pets pellets must be used as directed. Products for home garden use containing metaldehyde include: Ultimate Slug and Snail Killer, Deadfast Slug Killer, Doff Slug Killer Blue Mini Pellets, Westland Eraza Slug and Snail Killer.
In September 2020 the government announced the withdrawal of metaldehyde slug control, with product sales ending in March 2021 and remaining stocks to be used up or disposed of by 31st March 2022. The withdrawal was planned following advice from the UK expert committee on pesticides and the Health and Safety Executive (HSE) who consider that metaldehyde poses an unacceptable risk to birds and mammals. An initial withdrawal in 2019 was overturned due to problems with incorrect implementation.
Product names for slug pellets for home garden use containing metaldehyde that will be affected by this withdrawal include: Ultimate Slug and Snail Killer, Deadfast Slug Killer, Doff Slug Killer Blue Mini Pellets and Westland Eraza Slug and Snail Killer. Please be aware that these and other product names may be relaunched using ferric phosphate as the main ingredient instead, and check any products you have stored to make sure they are used up or disposed of safely by the end of March 2022.
Inclusion of a pesticide product does not indicate a recommendation or endorsement by the RHS. It is a list of products currently available to the home gardener
Most plants, once established, will tolerate some snail and slug damage so control measures can be discontinued. The RHS is researching sustainable control options for slugs and snails.
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)