What is the common name for Yucca filamentosa?

The common name for Yucca filamentosa is indeed Adam's Needle Yucca. This plant is known for its distinctive long, narrow, sword-like leaves that grow in a rosette formation, which resemble needles, hence the name "Adam's Needle." It typically produces tall flower spikes with white flowers that emerge in late spring to early summer.

While the other names listed refer to different species of Yucca, they are not applicable to Yucca filamentosa. Desert Spoon, for example, usually refers to the plant Dasylirion wheeleri, which has a different leaf and flower structure. Spanish Bayonet is commonly associated with Yucca aloifolia, which has sharper leaves and a different growth habit. Soaptree Yucca, on the other hand, pertains to Yucca elata, known for its tall trunk and broader leaves. Understanding these distinctions is crucial for correctly identifying and using these plants in horticulture.