Tree growth is intermittent process characterized by changes in stem form & dimension over period of timeIn forest, a growing trees add a layer of wood from ground to tip annually just under the bark, from ground level to tip and all around the stem. In cross section, these layers appear as annual rings, and the volume of each ring is a measure of the wood added to the central stem that particular year.

Tree growth shows elongation and thickening of roots, stems and branches. It is influenced by the genetic capabilities of a species interacting with the environment

Patterns of growth of a tree in terms of change in diameter, basal area, height, form and volume are affected to varying degrees by the crop structure, competition and stocking. Even aged crops of one spp. have very different growth patterns from uneven aged crops of several species.