If the vines are not pruned, you may have a lot of green growth without flowers. You can prune in mid-summer and in the fall. Then, cut back in the spring to 3 to 5 buds from the previous year’s growth. Do not fear that you are pruning excessively. Wisteria can take it. Another common technique to jump start flowering is to “root prune” the wisteria. With a shovel, dig a trench around the plant to cut the roots. Cut the roots 2 to 3 feet from the trunk. Do not cut the roots too close to the trunk.
If the vines are not pruned, you may have a lot of green growth without flowers. You can prune in mid-summer and in the fall. Then, cut back in the spring to 3 to 5 buds from the previous year’s growth. Do not fear that you are pruning excessively. Wisteria can take it. Another common technique to jump start flowering is to “root prune” the wisteria. With a shovel, dig a trench around the plant to cut the roots. Cut the roots 2 to 3 feet from the trunk. Do not cut the roots too close to the trunk.