Perennial vine suggestions?
I have 24x24x24 planters on either side of my patio door. The planters are attached to a lattice door-surround that just cries out for some kind of upwardly-mobile climbing vine. The spot gets a lot of sun so I could plant something like red runner beans (would it be too late for that this year? Too late to start seeds?) but I'd love to plant something perennial that could thrive as a permanent container plant. Anyone have any suggestions? I'm in central PA, BTW, where it gets *cold* in the winter, so any perennials have to be pretty hardy.