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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.
Roots use oxygen from the soil to carry out the growth process. Compaction of soil or an abundance of water is usually harmful to tree growth. However, some trees, such as baldcypress, have adapted to grow in wet conditions with a limited supply of oxygen.