Wisteria is one of the most beautiful flowering vines on earth, but it's also one of the most aggressive. All this vine needs is a sunny location and a strong support to thrive. These plants are a lot of work. I once saw a 3 story house pulled off its foundation by Wisteria. If you let it go unchecked, it'll rip your neighbors roof off while you aren't looking. I prune my wisteria four times a year, but most people only prune twice per year. I only allowed 4 tendrils to climb my structure (you have to tie them on to get them started) and no-more than 3 tendrils were allowed on each cross brace. Now that I've established a foundation of vines, right after the blooms fade and the tendrils begin to grow, I climb the ladder and cut the emerging tendrils to about 6 inches long from my structural vines. Those tendrils will grow 25 feet in one season and will get into a lot of mischief if you let them. Cutting them back puts all the energy that would have gone into 25 feet of growth into the 6 inch spur that remains. That initiates flower bud promotion supreme. My arbor is about 15 by 15 feet and I get over 1000 fragrant blooms every year! My Wisteria is a Japanese variety with longer flowers than the Chinese variety, but I love both types. Just remember that each variety twists a different direction. Never fight mama nature by trying to force the vines to twist in a direction other than the one in which they naturally grow: The vines will revert to their natural direction, uproot the trellis and tie you to it!