Tom and all
Dracunculus canariensis is not hardy in London, UK
(average minimum - 2 C). The main problem seems to be that it starts grwoth very
early (December or even a little earlier) and simply cannot handle frosting when
in leaf. I'd recommend frost-free in a well-ventilated greenhouse. The good news
is that grown in this manner D. canarensis is very easy. It produces copious
stolons each giving rise to a new tuber. It is also easy from seed and, if kept
growing will flower from seed in 18 months (compared with 3 - 4 years from D.