I was out getting a sack of potting soil today and got chatting with the guy at the grow store. He recommended a product called "Gnat-nix" for those pesky fungus gnats. It's a top dressing made of recycled glass, about the size of coarse sand. It is supposed to help prevent fungus gnat problems. I know a lot of you use Gnatrol, but when possible, I prefer to stay away from pesticides. Has anyone tried this stuff? Does it work?
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