Pollinator notes. The flowers offer both pollen and nectar, but most of the insects that visit the flowers, including beetles, flies and bees, are interested in pollen.
Pollen is usually produced first, before the stigmas become receptive to pollen (this means it is protandrous).
The anthers project above the flower; as female bees move across the flat inflorescence, they collect pollen on hairs on their body, which is later combed to pollen-collecting structures. Common bee genera visiting nannyberry include mining bees (Andrena spp.) and small sweat bees (Lasioglossum spp.).
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