Answer: Seedling grown wisterias may begin blooming over an unpredictable time frame ranging as long as 20 years with no way to reliably predict when a particular individual plant will begin blooming. So, your best bet would be to purchase a grafted plant in bloom at the nursery. Grafted plants tend to bloom immediately and this way you can select one with confidence that it is definitely already of blooming age. Different nurseries may stock different sizes of plant in various stages of training, if that is important to you as well. You might discuss with them what they expect to have available in stock and/or if they might be willing to try to special order something for you.
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