In order to study the necessity for thinning and a thinning schedule for keora (Sonneratia apetala) in the plantations, data were collected from the plots laid out in Barisal and Patuakhali coastal areas. Analysis of data indicates that mortality is generally low, more age-related than density-dependent, and that thinning will affect the survival marginally. Diameter increment decreased with increasing age and increasing density. At low densities a small enhancement of diameter increment is apparent for 5 and 6-year old plantations but this marginally exceeds the natural level of variability. Thinning may be avoided by adjustment of initial spacing—increasing it from 1.2m x 1.2m to 1.75m x 1.75m.