Are they edible?
Yer talking about Passiflora incarnata, right, which I remember you trying to preserve on your wayside area? Yes, it is, but not like a bite-into fruit. When ripe, as in just yellowing, prolly about two weeks from now, the seeds are encased in a jelly sac that is tasty. You open the casing, and suck on the seeds, and spit them out. If ya can beat the possums to them. My experience is that when they are not quite ripe they are tart.
I like to eat the leaves, too, really tasty, and the traditional medicinal use as a tea is sedative. I’ll leave you to look the particulars of that up yerownself.
Yes! I’ve been mowing the roadside this year, and the County Tractor Guy spared them. We had rain today, and I drove a couple of fence posts in to make a trellis. There was a rotten fruit that I “planted” further in the yard, and several that appear ripe on the round. I’ll run some twine between the two posts and two vines. There are half a dozen others that I will drive posts for. I was being devoured by mosquitoes at dusk. 
The rooted cuttings from last year didn’t come back, and the cuttings I took this year aren’t doing well inside.