Colutea arborescens, commonly known as Bladder Senna, is a deciduous shrub that is native to southern Europe and western Asia and is widely cultivated for its ornamental value in domestic gardens.
It typically grows to be a medium-sized shrub, with its most notable feature being the distinctive inflated seed pods, which resemble small bladders or balloons, hence the common name "bladder senna."
These pods appear in late summer and persist into autumn, adding visual interest to the garden even after the flowering season has ended.
It has pinnate leaves composed of small leaflets and in late spring to early summer, it bears clusters of bright yellow to orange pea-like flowers that are attractive to bees and butterflies.