Adding eggshells to the soil can stop slugs from eating plants, according to gardeners and experts. The sharp edges of crushed eggshells create a barrier that slugs and snails are reluctant to cross, protecting vegetables and strawberries from destruction.
How Eggshells Work as a Slug Barrier
Gardeners have long used eggshells as a natural deterrent. After rinsing and breaking the shells, they scatter the pieces around the base of vulnerable plants. Some gardeners keep the shells in halves to form a sizeable sharp-edged boundary, which has shown success in preventing slugs from accessing fruit and leaves.
However, after rainfall, the eggshell method can become less dependable as the shells turn slippery, reducing their effectiveness.
RHS-Recommended Natural Traps
The Royal Horticultural Society (RHS) describes additional natural strategies. On their website, RHS stated: "Traps, such as scooped-out half orange, grapefruit, or melon skins, can be laid out 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."
These traps entice molluscs away from edible produce, allowing salad leaves, vegetables, and strawberries to thrive without being consumed.
Biological Control with Nematodes
An organic product called 'Nemaslug' contains microscopic worms (nematodes) that can be applied directly into the soil. These worms enter slugs' bodies and infect them with bacteria that causes a deadly disease. This biological control presents no danger to other wildlife in the garden.
Why Avoid Chemical Pellets
Experts caution that slug pellets, even organic ones, can be harmful to wildlife in gardens. While slugs serve an important ecological function as food for birds and other animals, outdoor spaces can become overrun with these mollusc pests. Natural methods like eggshells, traps, and nematodes offer effective alternatives without collateral damage.
