Evelyn, you continue to amaze me with your capacity for hard work. Digging beds 2 feet deep?! Not me, not for a very, very long time!
Sherry, what's a "weed burner"? Is that anything like a small blowtorch? (DH uses a small blowtorch thingie to sear meat after he has sous vide cooked it.) I am constantly battling very small, low growing oxalis here. Burning it out sounds very tempting (and a lot faster than trying to get it out by the roots) but I think I'd have to move the mulch first...