This annual and perennial mixture of flowers will provide nectar to many species of butterflies, including brushfoots, monarchs, skippers, sulphurs and swallowtails. Some of these plants will also provide food for butterfly larvae. You may sow the bee feed mix 1 to 2 weeks before your average last frost date. Mix the seed with some sand or sawdust, broadcast the seed, and then go over the area with a rake to work the seed into the soil a little.