This seems so funny to me, but I have "thyme flies". I live in Florida, and I just started growing herbs in containers in my Florida room. I purchased the thyme, already started, from a local grocery store and transplanted it into a clay pot. There are what appear to be very small black flies that are nesting, living under the vegetation. They seem to be exclusive to the thyme, that is they are not bothering anything else I have out there. If anyone knows what I could do to control them in a healthful manner (for my herbs, not the flies of course), I would appreciate their advice.