Fungus Gnats on Cacti and Succulents: Dry Out the Soil

Wet Soil Breeds Gnats

Even cacti/succulents get gnats if soil stays damp.

Water by Weight Method

1. Saucer under pot.
2. Water, soak 5–10 min, pour off excess.
3. Pot should feel heavy.
4. Don't water again until pot feels considerably lighter.

Additional Controls

• Yellow sticky cards for adults.
• 1 tsp garden lime on soil surface (raises pH, deters gnats).
• Safer Soap soil drench (pro formulation).
• Buy from local nursery—they'll advise on products.

Cacti need thorough dry-down; this alone often solves it.