What is grand period of growth?

The three phases of growth mentioned above viz., cell formation, cell elon­gation and cell maturation are characterized by the three aspects of growth namely, (i) an initial period of growth (growth initiation), (ii) a period of maximum growth (cell elongation) and a period of steady growth mainte­nance (cell maturation). These three (iii) periods of growth together con­stitute what is called the grand period of growth. This grand period of growth is of universal occurrence. Whether it is the growth of individual cell or a tissue or an organ or in an entire individual, grand period of growth can be observed.