Have you tried Diatomaceous Earth?

I haven't yet. That was on my list of things to try, but I have read that it also harms beneficials like earthworms... I guess that's the price I'll have to pay, but I'm wondering if there isn't another way.

Trace them back to their nest are and apply the amdro there - very carefully, following the application instructions exactly.

Have you tried distracting them with other plants?

I use Amdro on my land, but I don't like to. It works great though. I wiped out 12.5 acres of ants with a couple of cups.

LazyGardens, do you have any recommendations for plants to sacrifice that would distract them from the edibles? Is it enough to just plant flowers or herbs around the perimeter?

It would depend on what they are eating. They tend to cut flat leaves like roses and other shrubs or trees.

I don't have them - or at least not enough of them to notice.

Are you certain the leaves are being cut by ants? I have never had such a problem and the only leaf cutters around my house are wasps who cut rose leaves. I would try the DE; your worms are underground and are not likely to slither through the DE.

TM, yes, I'm certain. I can see the trail of them coming up from the water drain in the patio (not sure where they're coming from to get in there) and traipsing right up the side of my raised bed. There are always 3-4 on the plants, munching away when I go out there. I shake them off, and I put down a mix of borax and sugar which only slows them down for a day or two.

If you interrupt the ants trail, they may go elsewhere to search for food. This article - and most I found - focus on keeping them out of your house, but stopping the trail is key anywhere.

Here is a link that might be useful: Eliminating ant trails

That is helpful -- thank you! In all the reading I've done, I never saw that they leave a scent trail to follow.

I'll be giving several of these a try! Hopefully something will work -- my raised bed is my "proving ground" to DH that I can grow stuff in our yard. If I can't make this work, we don't get a "real" garden. I found what I think is the actual mound so I'll be treating that, too.

Baby powder works great