The growth and starch accumulation process of sago palms cultivated on deep (DPS) or shallow peat soil (SPS) and mineral soil (MS) at Mukah and Dalat in Sarawak, Malaysia, were analyzed to examine the effects of the soil types on the growth and starch production. For the sago palms cultivated on DPS, longer years were required to reach the harvesting stage, while values for growth parameters including leaf emergence, trunk elongation and increase in trunk weight and volume were lower and resulted in lower trunk weight and volume at the harvesting stage compared with the sago palms cultivated on SPS and MS. On the other hand, the starch accumulation in the pith of trunk was monitored in the same way and a substantial starch accumulation started in the 3rd and 4th years after trunk formation in the sago palms cultivated on MS or SPS and DPS, respectively, while the trunk length and weight at that time were about 3m and 250-300kg, irrespective of the soil types. The soil types did not affect the average starch yield at the harvesting stage, i.e., 160-180kg per palm (dry weight basis) . However, these results might be due to the higher starch percentage in the pith of the sago palms cultivated on DPS associated with the favorable light conditions in the garden because of the short duration of the period after the opening of the garden compared with the sago palms cultivated on MS and SPS.