A Joshua tree is a very large yucca. They are well adapted to the Mohave high desert, 1,300 and 5,900 ft. They grow very fast. They had deep and wide root systems reaching up to 36 feet to get what water there is. They can live for hundreds of years . They have thick, waxy skins to prevent loss of water through evaporation.Joshua treesJoshua Tree National Park, located in part of the Mojave Desert in southeastern California. The Joshua tree is the best known of the plants endemic to the Mojave Desert, which is the only place where it is found