It's electric geology phenomena, not biological plant matter. Ropes of plasma deposited molten minerals in the positions seen, like as devil's tower and monument valley, the flat tops are a result of the natural voltage steps in the atmosphere. Many columnar basalt formations exist that cover vast stretches of flat ground that are not "tree" shaped in any way. Many geologic formations are excavated by electricity (Grand Canyon) others are Deposited (Devil's Tower).