After they mate, female fungus gnats lay eggs in the soil of potted plants – preferably moist soil. Gnat Nix discourages egg-laying by creating a physical barrier over the soil and keeping the surface dry. … This winter, I tried a sample bag of Gnat Nix from Growstone and found it worked even better than sand.

Why is gnat Nix discontinued?

NameGrowstone Gnat Nix 1.5 cu ft *DISCONTINUED*FREE ShippingNo

What is the best chemical to kill gnats?

Gnats can be killed with aerosol insecticides. Chemicals like pyrethrins, resmethrin, tetramethrin, and d-trans allethrin will kill any gnats they contact. Avoid spraying food or plants directly with these chemicals. Spray the insecticides every seven days for five weeks to get rid of the gnats for good.