Fungus gnats will lay eggs in houseplant container mix as well as media
for indoor tomatoes and other vegetables. One recommended remedy
is to put a 1/4-inch layer of sand on top of the potting mix so that the
gnats cannot reach the organic material underneath to lay their eggs.
(I guess they do not like sand because there is nothing in it for the larvae
to eat.)
That keeps fungus gnat larvae from chewing on the fine root tips of your
plants and no more gnats hatch there.
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