Abstract: An adjustable trunk support system which restrains a tree trunk within a specified containment area without permanently attaching to the trunk. One or more trunk supports are vertically adjustable to allow multiple trunk supports to be embedded in the ground at different heights on a slope while restraining the tree at the same height on the trunk. Adjustable arms laterally extend from the trunk supports such that the size of the containment area can be adjusted to accommodate tree growth. Adjustable locking ties secure to the adjustable arms to provide increased stability, and to provide pressure for the purpose of restraining, and/or training, a tree trunk.