re: Fire ants in the garden

I've had good luck with both amdro and spectracide mound killer. Stuff that "kills the queen". Read the directions and put it out when it's not going to rain for a few days.

They or another colony seems to pop up the next year in a completely different spot. But I had a bunch of mounds when I moved in and now only have one or two in the spring and after treating the mound is dead in two weeks.