Wisterias are rapid growers and can shoot up 10 feet or more in a single growing season. That’s great if you want to quickly cover a fence or pergola. Dramatic clusters of blue-violet to red-violet flowers with an intoxicating fragrance grace this vigorous twining climber. Its springtime cascading flower clusters can grow to 3 feet long or more in some cultivars. Blooms typically open first at the base and last at the tip of each cluster. Trunk diameter can reach 7 to 8 inches after 20 years, and the plant can climb to 35 or more feet in height, though its size is easily contolled by pruning.