Pesticide Residue in Former Lawns: Safety for Vegetable Gardens

Modern pesticides are chemically organic and decompose via sunlight, water, and soil microbes. Banned chemicals (chlordane, DDT) persist years but eventually disappear. Modern insecticides like deltamethrin have half-lives of 1-2 weeks. Residue in former lawn areas is likely negligible. For absolute certainty, remove 3 inches of soil and replace with clean topsoil before planting vegetables.