- Young plant - needs time to mature if it was grown from seed. Purchase grafted Wisteria vines instead.
- Not enough sun.
- Pruned incorrectly.
- Flower buds could have been killed due to a severe winter.
- Excessive nitrogen fertilizer.
To encourage blooming, try adding a superphosphate (0-20-0) in early spring and proper pruning during the year including root pruning in late fall. Wisteria does not transplant very well. Wisteria is a beautiful vine that can be outstanding in a garden setting. Just remember this plant will require more maintenance than most plants.