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Why Doesn't My Wisteria Plant Bloom?
Why Doesn't My Wisteria Plant Bloom?. Dr. Curtis Smith of the New Mexico State Cooperative Extension Service says the question of why a wisteria won't bloom is the first garden question he remembers from childhood. He says the answers are the same today.
Dr. Curtis Smith of the New Mexico State Cooperative Extension Service says the question of why a wisteria won't bloom is the first garden question he remembers from childhood. He says the answers are the same today.
Too Much Nitrogen
Dr. Smith says nitrogen stimulates leaf and stem growth, while plants use phosphorus for flower production. An imbalance in this ratio can cause wisteria plants to grow rapidly without flowering.
Stabilizing the Ratio
You can fertilize a wisteria with a product high in phosphorus and little to no nitrogen to increase the changes of blooming. You can also reduce the amount of nitrogen the roots take up by pruning the roots. Insert a shovel into the ground around the plant base to cut the roots, says Dr. Smith.
Pruning
Wisteria vines will bloom profusely when pruned severely, which is best done in early summer.
Age
If you're growing your wisteria from seed planted fewer than seven years ago, that's likely why you're not seeing flowers yet. Dr. Smith says wisterias grown from seed can take up to 10 years to bloom. Nursery-grown wisteria vines are normally propagated by cuttings from older stock and should bloom in the first year after planting.
