Using borax to kill ants
I have two garden beds that are completely infested by ants. They don't have a mound; they're using the soil in my beds as their home. Any time I disturb any part of the soil, there's a swarm of ants. I'm trying to figure out how to get rid of them. A common way is to use a borax and jam or peanut butter mixture as bait. I've had success with this in my house. However, since the ants are actually living in my beds, I worry that the borax they take back to the nest will be detrimental to my soil. I have no way of knowing how much will be carried back to the nest. (So, when I call the dirt in my beds "soil", it really isn't. When I filled my beds, I used peat moss, vermiculite, and compost.)
Does anyone know if ants taking borax back their nest will disrupt the fertility of the soil? Also, does anyone have any other suggestions for killing these buggers?
Thanks in advance!