Answer: There are many reasons why wisteria may fail to bloom. Wisteria grown from seed can take an average of about eight years to bloom or even as long as twenty years to start blooming, so the lack of flowering may be related to its age. If your plant is setting buds but does not bloom, it may be the result of variable spring weather damaging the buds. Or, your pruning schedule may need to be adjusted.
Based on your description, I am not certain what is causing the browning. Wisteria is deciduous, so it will lose its leaves every winter. Sometimes foliage can be damaged by chemical sprays or overfertilizing, so be sure to always read and follow any label directions for products you might use.
In my experience the best fertilizers for a large vine such as this would be a top dressing of good quality compost each spring, a year round organic mulch over the root area, and possibly a slow release granular fertilizer in the spring such as 10-10-10. Read and follow the label directions for how much to use.
Also, overfertilizing can cause excessive foliage growth at the expense of blooms. If the vine is planted next to a lawn that is being fertilized, you would not need to fertilize the vine in addition to that.
You may find the following wisteria care and pruning information helpful.
I hope this helps you trouble shoot.
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