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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.
All plants need water, air (carbon dioxide) and sunlight to live and grow. Many plants also require soil, or dirt, to grow. Plants absorb water through their roots into the stem or trunk and then into the leaves, shoots and flowers. The water carries the nutrients from the soil to all parts of the plant. The leaves of a plant absorb sunlight through a process called photosynthesis. The leaves are where the sun's light is changed into energy to help the plant grow. A plant also takes in and uses carbon dioxide from the air to help it grow and then releases oxygen back into the air.