This is the final phase of growth when the cell matures physiologically and morphologically. It assumes its final shape, size, and structure. Depending on the requirement, location, genetic factors etc differentiation sets in re­sulting in the formation of specialization in the mature tissue. Thus a meristematic cell matures into a parenchyma, sclerenchyma, xylem, phloem etc. Secondary cell walls are laid down during cell maturation.