African tree on the left.
In late 1800's the sugar plantation owner brought these African tree to Kauai. The purpose for these tree is that to blocks the winds so the sugar cane would grow straight up. This is a big mistake by the owner, by now most of the island are infested by this tree . Not only Kauai facing this problem, but the others Hawaii islands have to struggles with other unwanted plants that brought over from the human.
Some of the Hawaiian are still using their local plants for the medicine. Our Kayak tour guide have point out one of the tree on our trail to the secret falls. Instead of taking pain medications, he have using the leaves from this tree to ease the pain from his dislocated shoulder.