@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.

Of the ones you mention, the hydrangea will likely work the best. Any flowering plant needs sun to bloom heavily, but vines which are more adapted to shade conditions - like the hydrangea - will grow and look better even when not in bloom. For something less common, look for Holboellia or Schisandra, both shade loving flowering vines.

The only reason I am posting (re-opening this thread) is that charfair beat me to it. Kudzu is a VERY USEFUL plant - it is edible for both animals and humans, it is a nitrogen fixer, and it would be an AWESOME feedstock for cellulosic ethanol. The problem is that the AG industry is against it, therefore the proper harvesting equipment has not been invested in. Just like electric cars - the auto industry killed them. Personally, in the North, if I was to raise sheep or goats I would plant it as a cheap fodder source. HOWEVER, I must agree with the INVASIVE argument in this sense: White Mulberry trees are EXTREMELY INVASIVE here - you CANNOT KILL THEM!!! They take over everything!!! We had one that was planted by a bird. I left it there for years, but it never bore fruit. Then, when digging up a girdled Littleleaf Linden, I noticed all these vigorous orange roots in the planting hole - they were from the White Mulberry tree about 20 feet away. So, I cut down the mulberry - it came back as a giant super-fast growing shrub! Then I did research and was warned that you cannot kill them - the roots will not die; cut branches will sprout. Yeah, right, I thought. Well, I cut down the shrubby trunks, drilled holes into them and poured in poison and then topped it off with tar. The mulberry died - or so I thought! Now I have GAZILLIONS of baby mulberry trees growing throughout my entire yard. They grow from the teeniest, tiniest piece of root. I had a bag of leaves that I was saving for leaf mould, and when I opened it in the spring it was FULL of fresh, thriving, orange mulberry roots! I had to throw it out. The ONLY way to kill it is to burn it. The White Mulberry is an invasive species from Asia (also called "Russian Mulberry"); it has almost wiped out our native Red Mulberry trees. I bought a native Red Mulberry seedling and a European Black Mulberry (not invasive) to counteract this "Devil Tree." Finally this year I gave in to the realization that the only way to deal with the White Mulnerry is to control it by going around and pulling up the tiny babies as they first get leaves in the spring - BEFORE they are hidden under all the flowers, because they grow super-fast and then the roots get left in the ground and then they come back even stronger. So, there are legitimate arguments on both sides of the Kudzu issue - it is a very useful plant, but it must be properly maintained and controlled, not simply maligned because the interests of Big AG have prevented it's commercial use.

Lonicera sempervirens - this is the native one. Stick with this species. Don't get sucked into the invasive, non-native ones. Wisteria frutescens - again stick with this native one http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=d239 Campis radicans http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=b840 Clematis virginiana http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=a379 Bignonia capreolata http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=w830 Pay attention to blooming periods and plant a couple that will complement each other. Seems to me there are three that you could plant that would end up providing flowers all summer, at least in theory. My Lonicera sempervirens still has flowers on it now but the biggest bloom was in early summer.