Climbing and twining perennial of the Fabaceae family, present in almost all of Europe and temperate Asia, introduced in North America. It colonizes meadows, hedges, forest edges, embankments, and roadsides, from sea level to the montane zone.
The plant clings and climbs using terminal tendrils, reaching 60 to 120 cm by leaning on surrounding vegetation. When it finds no support, it can form rather dense cascading cushions, as illustrated here by a plant nestled in a rock crevice and spreading freely in a rounded mass, which is unusual and particularly photogenic.
The leaves are pinnate, composed of numerous pairs of narrow and elongated leaflets, bright green, giving the foliage a finely cut and light appearance. The flowers are gathered in dense unilateral clusters, blue-violet to blue-purple, typical of papilionaceous plants with their distinct banner, wings, and keel.
In its natural habitat, its flowering extends from June to August depending on the region and altitude.
Nitrogen-fixing plant thanks to root nodules, it plays an ecological role in the environments it occupies. It is not cultivated as an ornamental plant, but its ability to settle in crevices and difficult situations makes it a remarkable opportunistic colonizer.