A tree planting support system that mounts onto a tree trunk to stabilize a recently planted tree in a substantially vertical position until its root system can hold it in that orientation without the need for additional support. It has a housing assembly with a top wall, a bottom wall, a rear wall, first and second sidewalls, an angled front wall extending between first and second front walls, and at least one slot. The housing assembly further has a first interior base wall defining an angled cavity section, and a second interior base wall defining another angled cavity section. At least one band is secured through the at least one slot and at least one support post has first and second ends. A stake assembly also has two angled cavity sections.
