Hungry pollinators need flowers that produce lots of nectar (for carbohydrates) and pollen (for protein). Some bees also use waxes and resins from plants to build their nests. In return for the resources they receive, pollinators transfer pollen from a flower’s anthers (the male part of a plant) to another flower, where the pollen sticks to the stigma (the female part). The fertilized flower later yields fruit and seeds.
Over millennia, plants, like wildflowers, shrubs and trees, have evolved to attract bees and other pollinating insects. They all provide valuable forage; trees and shrubs in particular as they provide masses of flowers in one place. Many modern cultivars are grown for their showy flowers and do not produce nectar and so they are ignored by pollinators. The best way to attract bees to your garden is to select your flowers carefully.