The Joshua tree (Yucca brevifolia) bestows the architectural majesty and character of the American Southwest. It sculpts the landscape and provides an important habitat and food source for numerous native species. The plant is a yucca and is native to the Mojave Desert. It is an adaptable plant that can tolerate USDA plant hardiness zones 6a to 8b. The Joshua tree is the largest of the yuccas. It is an evergreen perennial plant that starts out as a stem-less rosette and gradually grows a thick trunk decorated by sword-like leaves. The leaves grow in clumps off a scaffold of open ranging branches. The effect is bizarre, yet picturesque, and is a hallmark of the Mojave Desert. Leaves are up to 14 inches (35.5 cm.) long, sharply tipped and bluish green.