I planted a four year old wisteria last year. It is now August and blooms are developing and opening. My previous wisteria always bloomed in spring. This spring was especially hot and this summer is hot and dry. My present wisteria did not bloom this year until just now in August. What do you think about this? Thank you.
Wisteria often send up a second flush of blooms in late summer. This year, we had a cold snap after the thaw, which may mean that the buds for your first set of blooms were frozen. Enjoy this unexpected bonus flowering and I suspect that your vine will bloom again next spring.