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Old April 29, 2019   #6
brownrexx's Avatar
Join Date: Feb 2016
Location: Southeastern PA
Posts: 1,368

Any soil can have fungus gnat eggs. I bought a seedling at a greenhouse and discovered fungus gnats after I put it with my seedlings. Grrrr.

I have also seen fungus gnats flying around bags of soil at stores so I am sure that they lay their eggs by going in through the breathing holes in the bags.

I bought generic mosquito dunks and the material was in clear packets. I broke one open and sprinkled on the soil of all pots and in a few days there were no more gnats. It is a bt product. You could also use Mosquito Dunks and break them apart.
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