On the downside, they are quicker to sunburn than some other plants. They are also not the best plants if you want consistent flowering indoors (except of course for the ubiquitous Kalanchoe blossefeldiana.) I have, however, been treated to Bryophyllum flowers now and again.
Here is a selection of most of the plants of this group that I'm growing at the present:
Two Kalanchoe beharensis flank a Kalanchoe orgyalis. The plant on the left sprouted from the stumps left behind when I took the cuttings that resulted in the plant on the right. More detail can be seen if this photo is clicked for the larger version.
Closer view of K. orgyalis. I do find this a bit more difficult to grow than my other Kalanchoes, but I keep trying because those coppery leaves are worth it.
K. beharensis 'Napoleon's Hat' This was one of those with a small crown of leaves on a tall stem, so I cut it back about three weeks ago. It has already rooted.
Kalanchoe tomentosa varieties. I believe that might be K. tomentosa 'Chocolate Soldier' on the right.
Two different pots of Kalanchoe beharensis 'Nudum.' This one has also been a bit difficult for me. I started out with a couple of large cuttings in 2005, which was slow to root, and then never flourished. But I was able to salvage some leaves, which produced the two smallish plants seen here.
Bryophyllum tubiflorum, one of the Mother-of-Thousands species. You can see the plantlets on the leaf tips, ready to drop and cause mayhem. I really don't mind having these pop up in my other plants from time to time, but I can see how they can cause problems for other growers, and become invasive in the wild.
Here are some Kalanchoe pictures from the Chicago Botanic Garden from this year and last. They seem to be favorites in the Sensory Garden outdoors, where plants with different textures are often featured.
Kalanchoe beharensis 'Fang' from this year. The little protrusions on the bottoms of the leaves, which give this variety its name, can be seen in the larger view.
Same variety, outdoor in the Sensory Garden last year. Though it looks smooth, it actually has a velvety texture. Though, to speak in fabric terms, the "nap" isn't as thick as the Kalanchoe beharensis varieties that I grow.