I didn't know there were any 'annual' Passiflora types, but I'm not all that familiar with the many varieties either. I wonder if some bloom on old growth and your winters are cold enough to kill what would produce blooms, but not enough to actually kill the plant. I've grown one or two, but I'm not sure of that either, so I'm just speculating. I think after 4-5 years they would be perennial plants rather than annual. Do the actual vines grow well for you? I currently have 'Lady Margaret' and am planning to overwinter it in the garage. Don't know how that will work.
