- Name: Joshua Tree - Other Common Names: Yucca Palm / Tree Yucca / Palm Tree Yucca - Scientific Name: Yucca Brevifolia - Color: White - Plant Seeds: When Soil Temp Warms To 70f - Bloom Time: Feb - April - Hardiness Zone: 6 - 11 - Plant Height: 20 - 45' - Plant Spacing: 15 - 20' - Light Requirements: Sun - Soil & Water Preferences: Average - Dry - Quantity: 5 Seeds - Other: The Joshua Tree Is A Cactus & Succulent Tree Native To The Deserts Of The Southwestern Us. It Is The Largest Of All The Yuccas, & They Can Live For Up To 150 Years! The Joshua Tree Has Spiky Evergreen Leaves That Measure 8 - 14" Long. The Branches Have A Forking Habit, & In The Deserts Where Habitat Is Limited, Birds Drill Holes In The Trunks & Branches To Make Nests. (This Does Not Harm The Plant.)