
My other big Opuntia is still alive and kicking on the other hand, although it, too has got very top heavy and unstable propped up in the corner of the kitchen windowsill. I've repotted it into a clay pot instead of a plastic one to try and give it a bit more stability. It's about 28" (71cm) high not counting the pot, and has grown four new pads in the four or five years that I've had it. I think it's tending to "bolt" a bit in the constant artificial light: if the weather's halfway decent this summer I'll pop it out on the balcony and give it some fresh air. The other two small cacti next to it seem to be doing OK, despite those awful Simpsons pots that they live in!