My wisteria blooms in the spring, but I'm wondering if it should bloom at other times also. My rose bushes, and I have several varieties, do not seem to grow very large. I have used a variety of fertilizers, watering systems, and amounts of water. They get plenty of sun in the summer, over 6 hours. I even removed a large quantity of clay/shale soil and filled the holes of some with a mix of loam and aged cow manure as I was planting them. The bush ages ranges from 3 to 7 years. I live in the mid Willamette valley of Oregon.
Wisteria Bloom Cycle/Rose Bushes
Wisterias fill the air with a heavenly scent that I look forward to each blooming time. There are different varieties that determine when the bloom will occur.
Japanese Wisteria (wisteria floribunda) I'm afraid I don't know when they bloom, but I think it's only once.
Chinese Wisteria (wisteria sinensis) blooms late spring to early summer.
American Wisteria (wisteria frutescens) blooms early to mid spring and again in the summer. I have heard the rebloom can be sporadic but I have a wonderful specimen and it blooms again without fail. I always recommend native planting for numerous reasons not least of which is protect biodiversity which is in danger. Birds love it for nesting and protection from the elements.
Kentucky Wisteria (wisteria macrostachya) blooms 1st in June and like the other native blooms again in summer.