Interesting thread. You very seldom see them as clumps in commerce. At least I don't in this locale. Since I don't know all that many plant fanatics who grow a lot of things and because I'm as hands-off as possible when I get a plant doing well and I'm curious about what they'll do, I tend to just let them run amok as long as they stay healthy
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I took some photos of a couple I've left to their own choice about how they grow. It was windy and mid-day, so the photos aren't the best, but they are good enough to show their pattern of growth.
Another Haworthia. This one is H. mirabilis v. badia in about a 10" diameter clay container. I like what it's doing.
Gasteria liliputana 'Dwarf Ox-Tongue' in about an 8" clay container. It just finished blooming heavily and I need to remove the bloom stalks. Another one I'm liking as a clump.
I'm liking this Kalanchoe 'Flapjack', but I also liked it as an individual speciman. I had it a couple of years and it bloomed. There was no offsetting until well after the blooms were in progress, so I was afraid I'd lose it as a monocarpic plant. Never have been confident of identifying which specific plant I have, but am inclined to think it's probably K. luciae.
Here it is a single speciman.
And here it is with the bloom stalk, which ultimately made the plant 8' tall from the bottom of the container, a 6" clay pot, to the top. The stalk actually lasted into a second year. It was hard to handle and top heavy, so when I thought it was a spent bloom stalk I cut half off when it was going back outside in the spring, but it continued to bloom on the lower half and lasted through the end of spring. It also made little plantlets around the blooms which I ended up rooting and gave away after they were growing well. Lots and lots of powder on the stalk.
The plants rooted from the plantlets off the stalk. I didn't remove and try all of them. I wasn't sure what they were, for sure. They just looked like tiny plants.