Plain, drugstore 70% isopropyl rubbing alcohol sprayed on the surface soil has worked for me. Not sure if it would hurt the plant to water immediately after, but I've always waited a day to water after spritzing on alcohol. I don't get these gnats very often, but when I have, rubbing alcohol has always worked.
Plain, drugstore 70% isopropyl rubbing alcohol sprayed on the surface soil has worked for me. Not sure if it would hurt the plant to water immediately after, but I've always waited a day to water after spritzing on alcohol. I don't get these gnats very often, but when I have, rubbing alcohol has always worked.