Plant Wisteria macrostachya 'Blue Moon' where you can enjoy its fragrant, blue-purple flower clusters and give it room to climb. This twining Kentucky wisteria is a North American native vine that can quickly cover a pergola, arbor, fence, or other very sturdy support, eventually reaching about 15-25 feet tall in good conditions.
For the best bloom, choose a sunny spot, though the vine will tolerate part shade. In richer soils it can put on lots of leafy growth, so focus on providing steady moisture while establishing, then water during prolonged dry spells. A slightly acidic, well-drained soil is ideal, but this plant is adaptable once settled.
Training early makes maintenance much easier: tie young shoots to wires or a trellis and guide the main stems where you want coverage. Prune after the main flush of flowers to control size, then prune again in late winter to shorten long shoots and encourage flowering spurs. Expect the heaviest bloom after the vine matures, but good siting and pruning can speed results.
Because wisteria becomes heavy with age, use posts and fasteners that will not fail under the load, and keep growth away from gutters and siding. With a little structure and routine pruning, 'Blue Moon' can be a long-lived, dramatic flowering vine for cold-winter gardens.