I have a highland truncata in a hanging basket, growing well but still quite small, which has put out a basal shoot. Now I've got a very large, much older lowland truncata that is also in a hanging basket, and is tilting greatly there's that much over the edge. But no basals. I visited the local Botanical Gardens, and they have a very old, massive lowland truncata which also is yet to produce a basal.
I wonder whether this is a one-off, or whether highland truncata more readily produces basals. Anyone got one on theirs?