It's a hardy, deciduous, woody climber. It drops its leaves and the thin fleshy stems leaving a woody framework over winter that then re-sprouts. It flowers early before most of the leaves have grown. It's originally from China (Wisteria sinensis) and named in honour of the American physician Caspar Wistar but for some reason it is not called "Wistaria". It has a delightful scent that carries in the Spring air.
Fantastic plant ! I have a similar jethro in my backyard. It is a Jade Vine from the Phillipines (Strongylodon macrobotrys ), and has the most unnatural colored flowers I have seen. I spent two years watering a seedling that wouldn't die or grow. Then it took over the house. Literally !
Thx for posting these, Svenedin. They're lovely, though I'm most drawn to this one. I admire your garden. Its just gotta be beautiful & a place of wonderful tranquility.