I've been trying to get cuttings from my passionvine to take root (in water), but no luck. Any suggestions?

Howard's "Texas Gardening The Natural Way" book states that the Passionvine is invasive.

I sowed some purchased seed last year. They didn't seem to establish. Then lo' and behold, 1 came up. It vined out great all year. I moved it this spring. Since then I have counted 6 vines shooting in the area where the original vine was planted (all about 6-9 inches apart). I am being careful not to harm these so that I can transplant them.

If yours are in the ground you might let if sprout a few extra vines.

Mine did not bloom last year. I suspect because it was still establishing its root system. I am looking forward to blooms this year.

My mother, in Irving, TX, has passion vines sprouting all over her backyard. I pulled up several and brought them to my house in South Florida, where they tried to "take" but the Julia butterflies and the Zebra longwings ate it as soon as it tried to sprout, so... mission accomplished! However, I was able to root it in water, although it took several months.

I was given some Passion Vine cuttings earlier this year. Since the area I plan to put the vines in is not ready for planting, I just put them in the ground in a shady area along the back fence. They seem to be taking and doing well.

I know it is invasive but I'd like some cuttings or seeds from the passionflower vine passiflower incarnata or whichever one will grow here and produce fruit. Or a tropical variety would be ok if it will grow in a pot and still produce fruit.