Pollination occurs at any time of year that flowers are blooming. As a hummingbird dips its bill into a flower to drink nectar, the sticky pollen clings to its bill and feathers. The bird carries the pollen to stigmas of similar plants as it travels from flower to flower. Many native plants on whose flowers hummingbirds feed heavily rely on them for pollination.

"This hummingbird has been busy, flying through the Lantana patch. See the pollen on its beak?" 
Amy Evoniuk  Newburgh, Indiana  September 28, 2014