Japanese Wisteria Floribunda
Wisteria Floribunda is a native to Japan, a climber, it will need some support as it grows, and will often form thick woody stems which will grow around whatever it climbs against.
An arbour or metal frame is ideal, as it will twist and climb around it in any shape desired.
It will produce masses of 30 cm or longer hanging racemes of blue to violet flowers in early summer, and will grow to around 9 meters or more given enough climbing space.
Fully hardy down to -15°C.