Let the top 1 to 2 inches of soil dry out between waterings
Remove standing water from saucers and trays
Replace the top layer of soil with fresh, dry potting mix
Repot the plant with sterile, well-draining soil if infestation is severe
Use yellow sticky traps near the plants to catch adult gnats
Water from the bottom when possible to keep the soil surface dry
Apply a thin layer of sand, diatomaceous earth, or fine gravel on the soil surface
Use BTI mosquito dunks or granules in watering water
Remove decaying leaves, dead plant matter, and organic debris from the soil
Quarantine infested plants away from healthy plants
Clean pots, trays, and nearby surfaces regularly
Avoid overwatering and improve drainage
Use a small fan to increase air movement around plants
Check new plants for gnats before bringing them indoors