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A tree's diameter growth is done via cell divisions in the cambium layer of the bark.

The tree trunk has to lengthen and expand as the tree grows in its search for moisture and sunlight. The root and drip zone of a tree is fragile and any significant soil disturbance close to the trunk can potentially harm a tree's health.Ī tree's trunk is critical for limb support and root-to-leaf nutrient and moisture transport. The majority of roots are found in the top 18 inches of soil and over half are actually in the top six inches of soil. To take full advantage of finding available moisture, tree roots run shallow with the exception of the anchoring taproot. Interestingly, root hairs have a very short life so the root system is always in expansion mode, growing to provide sustained maximum root hair production. The result is that soil is capable of resisting the erosion of wind and rain and becomes a firm platform for the tree itself. Gradually, the tiny roots reach out to so many particles of earth that the soil becomes firmly tied into place. Millions of those delicate, microscopic root hairs wrap themselves around individual grains of soil and absorb moisture along with dissolved minerals.Ī major soil benefit occurs when these root hairs grab soil particles. Root hairs are located just behind the hard, earth-probing root tips that burrow, elongate and expand in search of moisture while at the same time building a tree's ground support.

An important biologic functionary of the tree root system is the tiny, nearly invisible root 'hair'.

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