D. roseana is the D. capensis of subgenus Bryastrum. In my collection it's the first to produce gemmae and the produces the largest amount. Fortunately it doesn't seem to fling the gemmae far and wide as much as D. scorpioides or D. puchella (and hybrids). I have one plant that went from gemmae to a mature plant producing gemmae in 4 months. And this plant produces gemmae twice a year. Another bit of good fortune is D. roseana doesn't mind crowding at all.