The simplest way to break that cycle and get rid of them is to water all your plants from the bottom only and not let the top of the soil get moist. To be doubly certain of results I always keep closer to 1 inch totally dry and extend this routine for closer to 3 weeks, just to make sure.
Also before bringing plants home look around if you see any fungus gnats flying around the plant display area. You can also check the top of the soil for them by gently disturbing the soil with your fingertip. If you see any you will be better off to find another place to buy your plants. I hope this helps.
By Sylvia from Cobalt, Ontario
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