Fungus gnats are small, dark flies that are commonly found in houseplants and gardens. They thrive in moist soil, where their larvae feed on organic matter and plant roots. These pests can be a nuisance, as they often swarm around plants and can damage young seedlings. To control fungus gnats, it's important to let the soil dry out between waterings, as they prefer damp conditions. Using sticky traps can help catch adult gnats, while introducing beneficial insects like nematodes can target the larvae. Keeping your plants healthy is key to preventing these pesky invaders.