Slugs Slugs, a common Garden pest, are snails without a shell.
Size can vary from one-fourth inch to two inches depending on age and species.
They spend the winter as pearl-like eggs in protected places, usually under plant debris. Feeding occurs primarily in the evening and on dark, cloudy days. They eat irregularly-shaped holes in tender plant tissues, leaving a slime trail behind. Slugs require a cool, moist environment and won't survive long under dry, warm conditions. Slug populations thrive under frequent irrigation, heavy shade and high plant densities that keep soil cool and moist.