You could contact these guys, they are quite knowledgable about even the more rare passifloras.

Here is a link that might be useful: kartuz greenhouses

Catkim - I can go the reverse and tell you that Blue Crown, Constance Elliot and Lavender Lady are all "vigorous" growers. There's also a red at Annie's Annuals on the fence that's pretty "robust". I KNOW there are some that are not as vigorous - when you find out - let us know.

If you have gulf fritillary butterflies, the caterpillars will keep the vines in check.

What I mean is, once established, will this pop up all over the garden? I hear stories of marauding passion vines, similar to morning glory terrors. The idea of lots of caterpillars munching on it is not too appealing...

Ruby Glow and Scarlet Flame qualify for your request. Blue Crown does not. If you want to wait until this fall I will give you one of the qualifying plants. I am going to plant grapes instead.

Thanks for the information, Tim, much appreciated. Thanks also for your offer, but I am probably too impatient to wait. : ) Enjoy your grapes! Planning to make wine?

I have Amythist and some blue variety someone gave me. The Amythist (purple) one doesn't 'pop' up at all really, though it grows very fast, so you need to whack it back, but this isn't too hard. It will, however, root very easily where the vines contact the ground and I've had trimmings that I stepped upon take root. But again, not enough of this to be what I would consider an issue.

The Blue has popped up in a few places.

Now, it does attract caterpillars and they will eat a lot of the vine, especially in the winter, when the vine's growth doesn't keep pace, but I find them and the butterflies more charming than otherwise. YMMV.

-E!

I have had Ruby Glow for over 3 years in North OC, it grows vigorously, but no underground runners. On the other hand, the species Caerulea went wild and sent shoots underground to the point I had to yank it out. I am still battling little suckers 2 years later. Incense I have in the ground and it is not too bad, just 2 or 3 popped about 1 foot away. Rule of thumb: trilobed leaved-ones will spread, oval shiny-leaved ones do not (my experience). I sank 15 gal pots in the ground (the rim at the soil line) and planted Lavender Lady in. So far so good...hope this helps. Oh, and they do need vigorous annual pruning.
Sanda

This is a great page!

Here is a link that might be useful: passiflora pics

That does help, Sanda, thank you!