The Q&A Archives: Gnats In The Potting Soil

Question: how do i get rid of the gnats in your potting soil. my house is infested with them and i have 3 dogs inside. i cannot bomb my house because of the cold weather. lowe's suggested i contact you for a solution. i used this for repotting some house plants.

Answer: It sounds like you may have a problem with fungus gnats. These little pests are short lived and breed in damp soil. There are two approaches to controlling them. One is to make sure you are not overwatering your plants; if you have plants such as papyrus that require a wet soil, place a thin layer of fine gravel or sand on top of the soil surface. This eliminates their breeding ground and you should stop seeing them in a week or two as the life cycle stops. You can also treat them with a product labeled for fungus gnats such as Gnatrol. This is applied as a liquid drench to the soil and kills the next generation while it is in the soil. Again, you should stop seeing them in a week or two as the adults die off.

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