I know I've said something like this before about a few other species, but this genus grows so easily here for me in the inland valleys of southern California that I virtually ignore it until it blooms, which it does every year. F. crispa in particular grows almost like a weed, and I think that it could easily escape and naturalize if it were sold at the regular nurseries. It also, as Jim Shields mentioned, produces huge numbers of offsets. The other species aren't quite as prolific for me. The flowers on all of them have similar intricate features with highly frilled edges. F. crispa also has a characteristic scent that to me smells a little bit like chocolate at first, but with an unpleasant fetid undertone. This scent is very attractive to flies I've noticed. I basically give most of them no care whatsoever. Offsets that fall out of the pot will sprout wherever they are in the fall. I've started several other species from seeds, but none of them have reached flowering age yet, so I can't say much about them. --Lee