Thanks for the extra info on the bud drop. I was wondering if I was fertilizing them wrong or something (I fertilize occasionally, using an all-purpose fertilizer on everything) but the heat makes more sense. I have a greenhouse the size of a doll-house and the cacti live in there. The bottom holds almost 1/2 inch of water and everything in there seems to love that. But the greenhouse perhaps heated up too much. The whole living room is a bit of a greenhouse, it gets very hot in here on warm sunny days! So the greenhouse within a greenhouse was too much!
I have really nice sprouts on the cucumbers I started, and a lot of baby basil!
Here is what's left of my sedum Angelina!