Abstract: A tree brace unit for maintaining young trees in an upright posture has a circular ground-mounted base and a plurality of legs extending upwardly therefrom to a collar which encircles the tree trunk at an elevated level. The brace portion is formed from a pair of identical members formed from a single piece of metal rod. Each piece is bent to form a pair of parallel legs which are connected by a collar segment. When mounted in opposing position on the base, the two collar segments are clamped together to form a collar which extends completely around the tree trunk.