Recently I posted a list of plants to attract swallowtails and many of the plants on that list will be suitable for most areas of the country. However conditions vary from region to region so this list provides information from local experts covering seven areas from the Pacific Northwest to Mid-Atlantic, Northeast. In each case they suggest the best plants for their region. I found this information in an article by Meghan Shinn on the Horticulture Magazine website.
Seeking a few good plants for pollinators in your area? Here?s what experts recommend as a place to start. This list was compiled for Horticulture by garden writer Paige Embry.
Pacific Northwest?Gail Langellotto, Professor of Horticulture at Oregon State University
Zinnias should be planted for both butterflies and bees. Wild lilacs (Ceanothus spp.) attract bees in droves with their blue flowers. Oceanspray (Holodiscus discolor) offers frothy white flowers for small native bees and butterflies, plus good cover for birds.
California?The Urban Bee Lab at UC Berkeley
California lilac (Ceanothus spp.) and California poppies (Eschscholzia californica) are good choices for spring bloom. Summer-blooming bog sage (Salvia uliginosa) needs water but attracts hummingbirds, monarch butterflies and many bees. Tickseed (Coreopsis grandiflora) cultivars attract many bees; ?Flying Saucers?, ?Sunny Day? and ?Tequila Sunrise? are the best.
Southwest?Matthew Shepherd of the Xerces Society for Invertebrate Conservation
California poppies (Eschscholzia californica) offers yellow or orange flowers in full sun and dry, poor soil. Silvery lupine (Lupinus argenteus) attracts many butterflies and native bees with its purple flowers. Wild buckwheat (Eriogonum umbellatum) attracts butterflies and insects that prey on pests.
See more at Horticulture Magazine