You don't live in the south..or in the country do you? We have fire ant beds about every five feet down here. They love flower beds also. Having them in the house isn't so much the problem...but not being able to walk across your yard is.

Note: To stop them from coming in, put a little line of baby powder across the bottom of your doors. If they do get in, a little baby powder spread on their line will kill the ones you see, and stop new ones from getting in. Of course, baby powder is safe for pets...at least I think it is. Someone here will probably tell me how baby powder causes birth defects or somethong though....