A 3-4 ft. wide clump of pale-green, dagger-like leaves subtends the 4 1/2 ft. flowering stalk of this yucca. The 20-30 in. long leaves are evergreen, persisting for several years. Bell-shaped, greenish-white, pendulous flowers are followed by woody, oblong, cream-colored seed capsules. Soapweed Yucca is a member of the agave family (family Agavaceae). Agaves are stout plants with woody stems or stem-bases, often tall, even tree-like, the long and narrow leaves crowded in rosettes at ends of stems or branches, a stout rapidly growing flower stalk arising from the rosette.