Thanks so much for all your responses! I did end up digging for days on end until my back could take it no longer and, though it's no guarantee, I'm pretty sure I got 99% of it in this smaller bed (20'x8'). The biggest issue is that this bed has had peonies growing in it for, I'm told, 50+ years-the same peonies. I could not penetrate some of the peonies to get at the roots of the tiny monks weed plants growing on top of them. Winter has now set in so I'll need to wait until spring to see if I should just bulldoze the whole bed ... lol. Again, thanks for your responses. /Chrys