Why does the tree stay green all year? There others near this tree and they turn beautifully.
Certified GKH Gardening Expert
Do you mean that there are other sweet gum trees near that change, or just other types of trees in general? This could depend on where you are located, as you could be just inside the area that they remain evergreen, or you could just have a hardy type that is more cold tolerant than others.
This article will give you more information about the tree: https://www.gardeningknowhow.com/ornamental/trees/sweetgum/sweetgum-tree-info.htm