A tree living in nature on a steep cliff can bend downward as a result of several factors, like snow or falling rocks. These factors cause the tree to grow downwards. With Bonsai it can be difficult to maintain a downward-growing tree because the direction of growth opposes the tree’s natural tendency to grow upright. Cascade Bonsai are planted in tall pots. The tree should grow upright for a small stretch but then bend downward.