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.