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Most commercial cultivars are hermaphroditic ; cultivars that produce only functionally female flowers require the presence of male trees.

Male trees are seldom found as vegetative selection has favored hermaphroditic clones that produce a high proportion of functionally female flowers and a much lower number of flowers that produce pollen.

There are over 3000 greenish-white flowers in male panicles, each with 5-7 anthers and a non-functional ovary.

Male flowers have yellow nectaries and 5-7 stamens.

There are about 500 greenish-yellow flowers in each hermaphroditic panicle.

Each flower has six anthers, usually a bi-lobed stigma, and one ovule in each of its two sections ( locules ).

The flowers are receptive for about one day but may persist if pollinators are excluded.