Yucca angustissima

Yucca angustissima, known as the "narrow-leaved yucca" is native to Arizona, New Mexico, Colorado and Utah, but grown elsewhere as an ornamental.
Yucca angustissima is a low-lying species forming colonies of basal rosettes up to 3 m in diameter. Leaves are long and thin, up to 150 cm long but rarely more than 2 cm across. Flowers are white to cream or greenish-white, pendant, borne in racemes on stalks up to 2 m tall.
Yucca angustissima is relatively abundant, and although it has local threats, its population appears to be stable overall.
Yucca angustissima is frost hardy in Central Europe, at least -18°C.
They are still rare in collections.