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Going with the grain

Trees in temperate regions have two growing periods each year. At the start of the growing season the cells produced by the inside of the cambium (the growing layer just under the bark) have thin walls and large cavities to assist in the efficient movement of water and food from the roots to the rapidly developing leaves. This is known as 'spring wood' or 'early wood'. During the summer months when the crown has fully developed the need for water is reduced. Cells developing in this ...

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