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How Trees Grow The buds, root tips, and cambium layer are the three growing parts of the tree. Buds elongate the branches and widen the crown (branches and leaves), the cambium layer adds diameter to the tree, and the root tips grow in length to support the growth of the tree.
Photo by Jim Block. A treeâs growth is based, in part, on competition from its neighbors. Its first priority is to gain access to the sun, and in a forest up is the only way to go. (An open grown tree will grow out â notice how a yard maple is all crown and no stem.). But this explains why a tree grows tall, not how.ts first priority is to gain access to the sun, and in a forest up is the only way to go. (An open grown tree will grow out â notice how a yard maple is all crown and no stem.). But this explains why a tree grows tall, not how.