The potted White tree shoot is a quest item used in Garden of Tranquility. It is created by planting the white tree shoot into a plant pot. The original shoot is given by Dantaera, who says that the White tree is dying and the only way to save it is to grow a cutting from one of its branches.
The shoot should be watered with a watering can to produce the white tree shoot (water), and left to grow. Once large enough, the white tree sapling can be transplanted into Queen Ellamaria's garden behind Varrock Palace.