Shrub Yucca flaccida [Weakleaf Yucca] Closely related to the more common Yucca filamentosa (Adam's-needle Yucca), with the primary difference being its overall smaller size. Swordlike foliage gives this species the appearance of a desert plant, and it does tolerate dry soil well. Flower spikes bring overall plant height to over 6'. Best used in mass plantings. Doesn't like wet soils.