Answer: They probably are fungus gnats. These little pests feed and breed in decaying organic matter - in this case, moist potting soil. You can put a temporary barrier over the potting soil in your containers; plastic wrap or aluminum foil works well. Keep it on for a week or two and the gnats should die off. Or, cover the soil with a half-inch layer of sand or decorative rock. Either will keep the gnats from living in the potting soil. After you've covered the exposed soil, set a couple of traps to get the gnats that are flying around. I put an inch of vinegar in a glass or bottle and set a few of them in among the houseplants. The gnats are attracted to the vinegar, fly in and drown.
Best wishes with your houseplant collection.
Q&A Library Searching Tips