Tropicals & Tender Perennials: what is this, 1 by Floridian

Floridian wrote:
Simple to grow from cuttings, short or long, they root in water in just days.
The one in the PDB picture was a small cutting last April! It got real big, real fast. Mine is in such need of pruning but almost every branch has buds! It is a favorite of the big solitary bees, I often find the bees on the flowers and covered with dew on fall mornings.
I love this plant and hope I'm never sorry that I planted it!