Try the yellow sticky pads, they work well for fungus gnats and you don’t have to spray anything on the plants themselves. The gnats love yellow so they are immediately attracted to the sticky pads and once they land- they’re stuck. A few weeks and you’ll have them all! The sticky pads can be found in any hardware store/garden centre, don’t cost much and are the only way to truly get rid of your gnat problem. If you don’t know what I’m talking about, please let me know and I will post a pic of the pads I use on my latest diary for you to see and then take them down after you know what I’m talking about. Hope this helps a little! Good luck!
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