Yucca is a genus of over 40 perennial plants, shrubs, and trees. A few are grown as houseplants, including Yucca gigantea (also known as Y. guatemalensis and Y. elephantipes) and the Yucca aloifolia.

Of particular concern are disruptions to the delicate relationships between certain species that depend on each other for survival, such as the yucca plant and yucca moth, Li said. The small ...