• Like Kat said, hydroleca or something similar to cover the soil surface. Can use horticultural grit too, but it is more annoying to remove if you want to top-dress/repot etc.

    You can also hang a yellow sticky trap or two which will help drop the numbers quite quickly.

  • I'm no expert, but I do know there are many different types of nematode worms. I don't think the ones that eat gnats eat plants. They're strictly carnivorous, in a good way.

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