We don’t like using slug pellets as they are (unsurprisingly) very toxic. They contain the pesticide metaldehyde (usually dyed blue). It kills slugs, snails and anything that eats them, including frogs, toads, hedgehogs and birds as the toxins ‘bioaccummulate’, intensifying up the food chain. Even if you can ensure that wildlife don’t eat the pellets themselves, it is impossible to prevent them from eating the poisoned slugs and it’s one of the biggest threats to hedgehogs and song thrushes. Slug pellets are also poisonous to chickens and pets.
So over the years we have developed the following chemical-free, wildlife friendly techniques for protecting your garden from slugs. If you have any more tips to add to the list please comment below!
The Royal Horticultural Society has so many enquiries that they are doing a formal scientific test of traditional remedies to see if they actually work. They also point out there are about 40 different species of slugs and some are actually good for the ecosystem.
Please note that because home remedies like coffee grounds or soap haven’t yet been researched as a pesticide, it is illegal under EU regulations to use them..! According to this Independent article Bob Flowerdew, a regular on Radio 4’s Gardeners’ Question Time and the author of books on organic gardening, said: “Regulations are an ass, but they haven’t led to prosecutions. I cannot recommend that anyone breaks the law, but I can point out that, in other countries, people do use coffee grounds.”
1. Slug Removal
a. Go into the garden when it’s dark with a torch and pick them all up
b. Near your beds place tarp/flat stones or tiles that the slugs will hide under and simply pick them off in the morning
2. Physical Plant Protection
We’ve tried crushed shells, cut-off plastic bottles and sheep’s wool with little success to be honest (as above photo illustrates!).
However these slug collars have a good reputation and copper tape is meant to be effective (only while it is 100% intact) – but they are both quite expensive.
3. Potions & Powders Slugs Don’t Like
There are some things you can spray or put round your plants that slugs don’t like the taste of:
According to this ScienceNews article the neurotoxic caffeine destabilizes the mollusks’ heart rate, so coffee grounds and leftover coffee have been reported to be deadly to slugs (but not de-caf).
Una Dunnett’s Garlic Wash recipe for Hostas: Crush two bulbs of garlic, steam or boil them in two pints of water for three to four minutes until they’re blanched, Strain mixture and make back up to two pints. Leave it to cool, then mix one tablespoon into a gallon (3.8l) of water, and sprinkle on to hosta leaves in dry weather. Re-apply after it has rained.
4. Out of reach
We’ve had some success suspending planters of lettuce off the ground. These are a couple of old recycling baskets attached to an old sewing machine table base. Simply putting pots on chairs might help.
But don’t forget – when you transplant a plant into a safe new position there’s a chance you’ve taken a slug with it in the soil so check the plants for stow- aways the first couple of nights.
5. Grow plants that slugs don’t like to eat!
We’ve found that the following are safe from slugs: rocket, land cress, nasturtiums – probably because of their peppery taste. Also our chick pea and potato plants haven’t been nibbled at all.
6. Tasty Traps
You can use beer or make a potion that slugs find irresistible and then drown in. Thanks to PP reader Joan for sharing a Telegraph recipe from a few years ago that really works well:
Mix 2 cups warm water, 2 tbsp flour, 1 tsp sugar and half teaspoon yeast. Pour into shallow plastic container and leave near the affected plants.
Joan makes it in industrial quantities: 80g flour, 20g sugar, 10g yeast and 1 litre of warm water