we had a serious case of gnats from overwatering, or bad soil, or both. advice from a former bartender - put capfull of sweet vermouth out overnight. for plants, we set small glasses of sweet vermouth in our pots, it does trap the gnats. repeat every few days. have patience - could be used for household. (also a little bleach down the drains in the office kitchen.... ) we also used orange oil spray judiciously, and also cooking oil around the rim of the pots.
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