Studies at the Forest Research Institute show that only teak fruits of 14 mm or above in diameter should be used in nurseries. Smaller fruits produce so few seedlings that their use is not practical.

Smaller fruits usually produce very few seedlings because most them are empty, i. c., they contain no seeds. The presence of empty fruit varies from 15 to 41 percent among the five different localities of Bangladesh. Emptiness explained 78 percent of the variation in germination rates among five diameter classes of fruits.

Low germination rates of the fruits haye been widely reported to be a problem in work with teak reproduction.