Aeonium 'Sunburst' was said to be a variegated form of A. decorum, which is usually non-branching, but now there seems to be some doubt as to whether this is correct. But it is certainly true that when there are both single and clumping forms of a species, the more propagation-friendly clumpers come to dominate in the trade (examples: Agave victoriae-reginae, which is most often non-offsetting in nature; Aloe rupestris, normally single in nature).
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