Hi Sherry,
I've never grown it. May have to give it a try sometime.
It sounds like it will die back to the ground in zone 8.
Found this on Dave's Garden someone wrote---
On Sep 24, 2003, jermainiac from Seattle, WA (Zone 8a) wrote:
Proliferous bloom of white flowers on stalks. Strong vanilla-almond perfume. Loved by bees and ladybird beetles.
Cut back in winter. I have seen as a tree but then hard to enjoy the scent.
Read more:
cheers
