I have never had a cactus bloom like this one is doing. It must be the soil I used. It’s not real “dirt.” It’s a growing mixture and we have some leftover from plants Owen was growing that needed it. The stuff is expensive and it’s intended to get seeds started — which it absolutely does. It’s expensive, but it was perfect for the badly (very badly) cactuses in need of repotting. The dirt in those small pots was a couple of decades old, so there were probably no nutrients in it. And anyway, cacti really like sandy, gritty soil and a LOT of sunshine. For half the day. Not all day.
After the transplants, this plant looked pretty sad, Last month, they began to perk up and it decided to make a lot of buds. A bunch of which are blooming. I’m still amazed at the color. The red and white is exceptional. As I said, it has to be the stuff it’s growing in. It’s supposed to be a pH0 (neutral) growing material, but it sure has had a profound effect on this plant. Never seen anything like this.