The Q&A Archives: aphids on petunia and geranium

Question: I just purchased many new flowers to plant in my garden from Home Depot, including petunia, geranium, and herbs. I am seeing aphids in the soil, how do I kill the bugs?

Answer: Aphids feed on foliage so if the pests are in the soil, you're probably dealing with fungus gnats. These look like tiny flies. They feed and breed in decaying organic matter so are naturally attracted to moist potting soil. You can plant your new plants outdoors and the fungus gnats will go away, especially if you use a dry mulch over the soil after transplanting. A dry barrier will keep fungus gnats from breeding and feeding in the potting soil.

Best wishes with your new plants!

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