BIOLOGY
N. heimii, unlike most dipterocarps, sets flowers and fruits annually, the
times varying from year to year. Generally, in Malaysia flowering time is in
March-November while fruiting is January-December. The fruits ripen
about 5 months following first appearance of flowers
Planted trees have been known to set fruit as early as the age of ten
years. Pollination is by insects especially honeybees. Seed dispersal is by
rolling hill slopes or animals.