@Shad Burns I'm curious, where did you buy your seeds or vines from? I grow them too, and I'm always curious about the source of passiflora incarnata, when grown successfully in zone 5/6. Mine were selected from the wild, in Michigan, Indiana, and Ohio. I'm always interested in hardier strains. @Helene Albert I am in zone 5b, Chicago suburbs, literally a stone throws away from you. I grow passiflora incarnata successfully. I have fruit that's ready to harvest at end of August continuing through to October. It's truly a may sprouting perennial for me. If anyone is growing passiflora incarnata in zone 4/5/6a, please send me a message through Houzz by clicking my profile. I cannot send messages by default to most people, because messages are not enabled by default in Houzz until you go to your profile and enable them under "advanced settings." You should be able to send to me, however. I collect hardy passiflora incarnata. There is some genetic variation. Even the white version of P. incarnata aren't the same, with at least 5+ different strains floating around.

If you want a wisteria, you should get a wisteria. There is a wisteria developed for zone 10 called the Blue Moon Wisteria. It's sold by Stark Brothers for $15.99 as of July 2017. (I discovered your post when I was trying to find one for my zone, also 10, in the foothills of southern California--rocky, sandy soil with ugly, hot weather and some cold snaps. Finally decided I would build the pergola first, but I have to find out if it has to be permitted. If it must be, I'll put in an informal cedar trellis instead. *ugh*) Keep in mind, the zone maps have to do with FREEZING temperatures. It's not carved in stone, and many plants that are NOT exposed to freezing (or non-freezing, as with the higher zones like 10, will be just fine--not like apples that need freeze hours. You need to know your plants (& area). If you're afraid that your plant will freeze, you can purchase gardening cloth to cover your plant in winter or while getting it started. The right kind will protect your plant from animals, certain amounts of freezing, and still ALLOWS water and sunlight through for very little $. (Short plants=cover gently and stake down.) Just don't use plastic (touching your plant). Think of your plastic wrapped fridge veggies--it lets cold right through. You can use a blanket or cotton sheet in emergency. Even a halogen lamp can save a small tree--just don't put the blanket/sheet over the lamp--hah!..fire! Be prepared. (Most folks won't go to the trouble of buying a can of anti-transpirant. [seals the plant from freezing for 3 months.] Also, some areas have their own personal weather because of land formations, building walls, even boulders, fences, & some plants or trees. Properly sheltered, plants can thrive. You could have perfect zone, but put a plant in dead soil (low microbes/fungi), under-water, over-water, etc., and it could die. The gov'mt is giving us an "odds" chart--does it include freak weather? I lived with small Passifloras in my dad's land around the farm. Never knew they grew as a big vine till this site. Loved them for their exotic beauty. All dad saw was "weeds." Sorry for the epistle, but Good luck y'all! P.S. Halfwaythere, for the cables you are considering using, there's a website that goes into rust, the breakaway strength & will lead you into stainless steel, coated, etc. (thecableconnection.com

I have been working to kill Wisteria in my easement since I bought this place in 2010 and it's still here. When I bought the place it covered the back fence and hung from the trees. I spray the leaves with 2.4.D (you can buy concentrate at Southern States), then I take a saw to the large pieces. If it's in the trees, all you have to do is cut the piece that roots to the ground and the rest will die (that's a great feeling watching that stuff wilt) I had several trees that had been girdled and used a bow saw. You can paint the raw cuts with the concentrate. Look along the ground and find the long runners and clip those too. I go out in the easement twice a year now to maintain it. I'll never completely get rid of it because I have neighbors that don't care but the stretch behind my house is almost completely clear. I did sneak over this morning into my neighbor's patch and hacked down a vine that was as big around as my upper arm. All this time I thought it was a sapling. You may not be able to completely get rid of it if your neighbors aren't helping but you can get it to a twice yearly management. What sprouts up in my yard from seed, I just mow down. If you can find the source plant, you can do a lot of damage by hacking that one to bits. It gets less and less each year. It's hard work, there's no way around that but it will get better and better. Do be careful with 2.4.D, as it will vaporize above 90 degrees and kill lots of other unintended things. You have to spray early in the morning or late at night so the spray will dry before it gets too hot.

Also, depending on the variety you will likely have to protect your plant, perhaps take it indoors over the winter, or risk losing it during the winter. There are some reported to be hardy to your zone, but getting a good head-start on root development is key! There is a passionflower forum, and they're real nice people. be warned though, the pictures will have you looking for varieties to add to your collection (I now have 6) ~Chills