The highest of the 36 domes is 546 m (1,791 ft) above the surrounding plain. And yes they are full size trees. They can't survive out in the open desert with no shade & no water. (There is some limited run-off from the huge rocks, when it does rain, but it is soon soaked up by the thirsty desert sands) This area is very similar to Arizona and Utah.
Valley of the Winds Kata Tjuta (42)