I want to send out a few cuttings of my Vulsa (alleged Vulcanicola/Sanguinea cross) brugmansia, I grew it over last season and it overwintered well in the green house and grew to a respectable size, and now is in the ground in a protected nook of my property, but I suspect it will not fare well with the hot summer and I want to work on propagating it. I've found warm group bruggies to be easy to propagate, just chop a stalk and stick in the ground for next season, but I'd read somewhere else that cold group brugmansia propagate differently, perhaps by non-woody growth. I could also theoretically air layer them, but it's a technique I've never actually tried.
TL;DR How does one propagate cold group brugmansia cuttings?