Let the top 1–2 inches of soil dry out between waterings
Remove standing water from saucers and trays
Water from the bottom when possible
Replace the top layer of soil with fresh, dry potting mix or sand
Use yellow sticky traps near the plants
Apply sticky traps directly to flying gnats
Treat the soil with BTI mosquito dunks or bits
Use a hydrogen peroxide and water soil drench
Repot the plant with fresh sterile potting mix if infestation is severe
Remove decaying leaves and plant debris from the soil surface
Check for overwatering and reduce watering frequency
Quarantine infested plants from healthy ones
Use a fine layer of diatomaceous earth on dry soil
Empty and clean nearby trash, compost, and drains
Keep indoor plant areas well ventilated