Ever flowering wisteria

Wisteria on our shed

We have a wisteria plant that is currently hiding our workshop. Even if we wanted to open the doors we wouldn't be able to, some major pruning will be happening next spring. For the moment I am puzzled by the flowers. This is the second flowering this year. Are we just very lucky or did the previous owners plant two varieties? Perhaps this too will be answered when we prune. For now I will allow the bees to enjoy the flowers.