What characteristics of a flower attract pollinators?

Color, fragrance, nectar, and shape are characteristics that attract pollinators to flowers. Bright colors such as red, purple, and yellow are attractive to bees and butterflies, while a strong fragrance can lure in insects. Nectar provides a food source for pollinators, and the shape of the flower may be adapted to a specific pollinator, such as a long tube for hummingbirds.