A lot of Heritiera fomes (Sundri) trees have been dying due to a disorder known as top dying disorder, caused by different environmental, physicochemical and pathological factors. A study was initiated to increased yield by capturing higher genetic gain and availability of pests and diseases free sundri for sustainable production. All seeds were collected from selected 30 healthy sundri trees and seedlings were planted in three salinity zones of Sundarbans from 2010-2017. Plantations at fresh water zone always showed the high growth in height (m) and high survival rate (%). Mean height and survival rate (%) for Sundri plantations were 1.82m and 58.95% respectively. The mean height for less, moderate and strong saline zones were 2.31m, 1.63m and 0.73m where mean survival rate (%) were 81.84%, 38.75% and 49.51% respectively. Creating more Sundri stand from top dying free mother tree will compensation the loss of top dying and thus minimize the top dying effect in Sundarbans.