Let the top 1 to 2 inches of soil dry out between waterings
Remove standing water from saucers, trays, and cachepots
Water from the bottom when possible
Replace or remove decaying leaves and plant debris from the soil surface
Cover the soil surface with a thin layer of sand, diatomaceous earth, or decorative gravel
Use yellow sticky traps near the plants to catch adult gnats
Apply beneficial nematodes to the soil
Use BTI mosquito dunks or granules in watering water
Repot the plant with fresh, sterile potting mix if the infestation is severe
Check for overwatering and improve drainage
Quarantine infested plants away from others
Inspect new plants before bringing them indoors
Avoid using outdoor soil or compost in houseplants
Repeat treatments weekly until the gnats are gone