Seed Savers Exchange 1289 Open-pollinated Sunflower Seed, Sunflower Mixture, 100 Seed Packet A complete mixture of species and forms; if you can only plant one packet of sunflower seeds, this would be the one Extended bloom period provides a nice supply of flowers for cutting from July until frost For longer-lasting bouquets, be sure to pick heads that are just about to open Plants average 4-6' tall; annual, starts blooming at 60 days