When doves feed, they store seeds temporarily in the crop before grinding and digesting. This allows them to complete their feeding in a short time. After you shoot doves, carefully examine the contents of the crop and see what the birds have been eating. Crop analysis will suggest native plants to grow to attract doves. To identify seeds, make a collection of known seeds by collecting seed heads and rubbing them between your palms to separate the seeds. Save the seeds in a little vial and compare seeds from dove crops with your reference collection. County Extension agents or other wildlife professionals can identify seeds or will forward them to others who can.