This is yucca.

Jade bamboo, for the lily family perennial herb. The rhizome walks horizontally, fleshy yellowish-white, densely packed with most fibrous roots. Leaf surface green, gray below. Flowers are axillary, usually in clusters of 1 to 3. Native to southwest China, but widely distributed in the wild. Cold-resistant, also shade-resistant, preferring moist environments, suitable for growing in humus-rich loose soil. The Materia Medica Jing Jiezhu" cloud "stem is strong and straight, like bamboo arrow shafts, with joints." Therefore, it has the name of jade bamboo. The rhizome of the plant can be used for medicinal purposes, and the name of the Chinese medicine is also yuzhu, which is harvested in the fall, washed, sun-dried to softness, rubbed repeatedly, and dried until there is no hard heart, or steamed through, rubbed until translucent, dried, and cut into thick slices or segments for use. Yucca extract flavonoids substances and mulberry leaf extract deoxynojirimycin combined to form a new substance - wash pancreatic cleansing glycosides (cics), with lowering blood glucose, blood lipids, blood pressure and other effects.