Answer: Joshua trees (Yucca brevifolia) are native to the southwest desert areas of California, Nevada, and Arizona. They would not be hardy in your growing zone, or at your elevation. The trees grow slowly to 15-30 feet with a single, heavy trunk and few, heavy branches. They have short, broad, swoard-shaped leaves that cluster near the ends of the branches. They grow best in dry, well-drained soil in desert gardens.
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