I spread eggshells around my lettuce for years to keep slugs away: the morning I watched one cross the barrier, I understood why my plants kept getting eaten
For years, gardeners scattered crushed eggshells around lettuce believing the sharp edges would deter slugs. But one observation changed everything: watching a slug glide effortlessly across the barrier revealed what researchers have known all along—eggshells don’t work. Science now offers better solutions.