Maybe, but.....prickly pear typically grows where there's not a lot of "food", at least I've seen more than one person say to get rid of it by amending the soil. I'd think the best thing for them would be to replicate their native conditions, which wouldn't get much added nutrients. They probably would benefit more from a bit extra of water when we go without rain for the winter. I'd think the barrel cactus would be the same, but I'm not sure about the rest. From my experience, cacti in the ground benefit best from benign neglect!

Thanks! That's pretty much what I figured ;-) I don't want to kill them with kindness.

Pam