What earwigs actually do to a garden
European earwigs are nocturnal feeders with chewing mouthparts, and they use them on the softest tissue available: tender seedlings, flower petals, and the surface of ripening soft fruit like peaches and strawberries. The resulting damage looks like small, ragged holes rather than the neat consumption of a whole leaf, and it's most visible on plants that haven't yet hardened off — a young seedling shows the damage far more dramatically than an established perennial does.
Corn silk is a specific, sometimes-serious exception: earwig feeding on silk can interfere with pollination and reduce kernel set, which is a genuine yield concern for anyone growing corn at home. But even here, the effect is limited to the crop and the season, not a broader threat to the garden or the property.

