I am trying to decide what flowering vine to plant up over the pergola on our upper deck. I'm in (cold zone 4) - deck faces south in full sun. The deck is 9 ft above ground and the small pergola is another 6 ft above that, so either the plant has to climb from the ground or be potted on the deck. (A pot could be brought indoors over winter). Here's the catch! I want color all summer, so a long blooming plant is important. Any suggestions?