Yes, P.incarnata originates from the USA and will grow from FL to Connecticut as it is rather hardy. So it makes also a good choice for hybridizing with tropical species and creating a cold tolerant one.
I have some that grow here in South Carolina all the time. Die back in winter and come back in the spring. They bloom purple and have big pods of fruit on them. We always called them Maypops when I was young. We ate the fruit pods when they turned yellow. It's full of seeds like a pomagranet . What is the real name for it, do you know which one I'm talking about? It's purple and white. A friend I met at Daves garden site gave me one called Monika, he named and he said it blooms red. I'm just starting it . I can't wait for blooms. I also just planted some Passiflora mollissima and was wondering how long does it take to sprout from seeds? Thanks. Mekos
Maypops is the common name for Passiflora incarnant, native to the USA, a rather hardy species and used as such to create hardy hybrids using tropicals. Fruits are edible though not the greatest (to my taste!). 'Monika Fischer' is an hybrid created by Roland Fischer (a German grower) by crossing (P.incarnata x P.amethystina) 4n with (P.kermesina x P.caerulea) 4n, this is a polyploid.
P.mollissima should germinate within three to six weeks, it is a cool weather one originating from the Andes, beautiful flowers!