Plantation Trial Unit Division of Bangladesh Forest Research Institute (BFRl) carried out a research in the western coastal area of Bangladesh during 2018—2020 in order to assess the growth of Sonneratia apetala (Keora) in relation to stand age. For this purpose, in the Char Kukri-Mukri area, 32 PSPs were established for eight age classes (11, 15, 20, 30, 35, 40, 42, and 45 years), and in the Rangabali area, 28 PSPs were established for seven age classes (30, 35, 42, 44, 45, 48, and 50years), followed by a stratified random sampling method. A significant difference was found (p < 0.05) for the height and diameter at breast height (DBH) growth of S. apetala stand among the different ages of plantation in both areas. At the Char Kukri-Mukri area, for 11 years old plantation found the highest height (0.357m) and DBH (0.570cm) growth rate after 1 year and continued after 2 years (0.662m; 1.085cm). On the other hand, for a stand age of 30 years, the highest height (0.216m) and DBH (0.246cm) growth rate were found in the Rangabali area after 1 year and continued after 2 years (0.353m; 0.390cm). A positive and strong relationship was found between height and DBH growth
rate after 1 and 2 years (r=0.850 and r=0.891) in the Char Kukri-Mukri area respectively. On the other hand, a positive and very strong relationship was found between height and DBH growth rate after 1 and 2 years (r=0.931 and r=0.913) in the Rangabali area
successively. This result will aid in the selection of appropriate forest management practices for managing S. apetala plantations on a sustainable basis in the western coastal belt of Bangladesh.