This is Wisteria frutescens, also known as American Wisteria. This plant likes sun to partial shade and blooms in the middle of the Spring. Wisteria frutescens can be grown inside near a window. These gorgeous blooms range from blue to violet to lavender. This is the caterpillar larval host plant of the Long-tailed Skipper and Juvenals Duskywing butterflies, and the nectar plant for many others. USDA Hardiness Zones 6 to 9.