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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.
As time goes on, you will be able to tell by the condition of tree or shrub, whether or not it needs more fertilizer, Penhallegon said. Typically, healthy trees and shrubs have 12 to 18 inches of branch growth per year. Apply the fertilizer along the drip line of the tree, the area with the majority of the roots.