Greenhouse Growbags question.
In article , Dave.Whipp.2266817
@gardenbanter.co.uk says...
Last year I had a lot of small black flies, which I believe are
encouraged by having damp earth to lay their eggs in, so I'm thinking
that if I concrete flag the floor first, this will help eliminate the
black flies problem ?
Look up fungus gnats and see if that's what you were observing.
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