I grow herbs and flowers in brick raised beds around my patio. In the evenings, I often see dozens of snails around the bricks and in the beds around the plants. How do you keep snails from eating everything in the garden?
The best way to keep snails (and their slimy mollusk cousins, slugs) from dining in your garden is to keep them out of the beds in the first place. Garden experts and home gardeners have a variety of tips and techniques for this, mostly involving barriers to separate the mollusks from your plants, but also ways to trap them and remedies to reduce snail and slug habitat. The tips here are from two sources, The Gardener’s A-Z Guide to Growing Organic Food and Rodale’s Vegetable Garden Problem Solver:
- Soft-bodied snails and slugs a reluctant to cross scratchy materials, such as pine needles or crushed eggshells. A continuous barrier of that powdery, sharp-edge irritant, diatomaceous earth, should keep snails at a distance. Others have suggested spreading coffee grounds or sharp sand around vulnerable plants.
- Copper gives slugs and snails a mild electric shock when they come into contact with it, so a strip of copper flashing tacked around the outside of raised beds can be an effective deterrent.
- Strips of hardware cloth around the bed can also keep snails from crossing. Make sure it extends a couple of inches above the bed, and for extra protection, cut the wire so that it leaves sharp points along the top edge.
- Set out traps. A shallow pan of beer, or of yeast, sugar and water, lures them in, and they drown. A suggested recipe: 3 cups of water, 1 tablespoon of granulated yeast, and 2 tablespoons of sugar. Snails and slugs stay in the shade during the day and come out to dine at night when it’s cool and moist. You can prop a wide board about an inch off the ground to create an alluring daytime shelter, and collect and dispose of them after they’ve gathered there.
- Reduce snail habitat by cleaning up around the beds. Loose bricks, boards, moist piles of leaves and other garden debris provide dark, cool places for slugs and snails to hang out during the day while they’re waiting for nightfall to come out and dine at your garden buffet.
- If you normally water the garden in the evening, change your routine to morning watering so the soil surface dries quickly.
If one technique doesn’t work, try another, or try a combination of techniques to reduce the snail population in your garden.