Device for preventing a tree root ball (1) from falling over comprises an anchoring part (6) having an upper region (61) that is inserted from below into the root ball and a lower region (62) such as a pin for anchoring into the ground (7). Preferred Features: The anchoring part consists of two pointed triangular plates that are joined together. The height (h) of the upper part is about one third of the overall height (H) of the anchoring part.
