Providing wildflower-rich habitat is the most significant action you can take to support pollinators. Adult bees, butterflies, and other pollinators require nectar as their primary food source, and female bees collect pollen as food for their offspring. Native plants (species that existed in North America prior to European colonization) are adapted to local soils and climates, and are usually the best sources of nectar and pollen for native pollinators. Incorporating native wildflowers, shrubs, and trees into any landscape promotes local biological diversity and provides shelter and food for a diversity of wildlife. Prior to purchasing, make sure plants have not been treated with systemic pesticides. A list of local native growers can be found here.