The only scientifically-proven, non-toxic fungus gnat control, Made from 100% recycled glass, University trials have proved Gnat Nix! used as a top dressing creates an effective physical barrier against fungus gnats, Prevents adult emergence from hatching larvae and deters females from laying eggs in the growing media, Apply 1/2- 3/4 layer to fully cover the surface in your growing containers, making sure the entire top surfaces of all containers are fully covered
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