If you do a search here for this plant, you'll find several threads started by Martin in Vancouver... he has great success with this vine. It does seem to be very finnicky about growing conditions. The year that I had success with it, I just happened to find a mature plant in a one gallon container at a local nursery. I collected hundreds of seeds. All of my seedlings germinated the following year, but none of them made it to bloom... apparently, my thumbs aren't green enough and my patience is a little too short for this plant
If you can figure out the right formula for growing it in your neck of the woods, it's worth the effort... the hummingbirds here loved it...
USDA Plant Zone 6a
Camera: Pentax K20D
Lens: Pentax DA*300 f/4, Sigma 180 f/3.5 Macro
There's 1 or 2 more hummingbird / butterfly pics located here...