Hi James, As to hardiness of S. African glad species, I would guess that about 25-40% could be hardy long term around Vancouver; that is, at least 5 years. We get so darn much rain from November through March that it makes correct siting crucial. Until recently, we'd grown G. psittacinus for 15 years before it disappeared, as well as G. papilio - still growing strong, of course. I am looking forward to trying many more. This zone 7 with copious moisture is tricky! Brent Vancouver, BC