Geonoma congesta is monoecious, which means that there are both male and female flowers on the same plant. The flowers, however, are unisexual and each sex is distinct from the other on the inflorescence. The inflorescence is interfoliar, because it emerges between the sheathing petioles at the base of the leaves.
The male flowers give off a light, sweet fragrance that attracts pollinating insects, such as flies, beetles, and thrips.
Geonoma congesta is propagated via its seeds. Oftentimes, birds and rodents eat the flesh of the fruits, which helps spread the seeds afterward.