They'll form sideshoots in time. This sideshoots will grow into the size of adults in thickness. But for quick propagation. Every stem there you can cut in half. Plant the tops. Leave the bottoms. Both genus will sideshoot very fast. You'll find multiplication very easy in these two genus'. If you just leave them the tonina genus will take longer but they will form sideshoots. These are not slow plants, multiplying them is very rapid.