(Helianthus annus) One of the first exports sent back to Europe by early explorers of the Americas was sunflower seed from the native sunflowers. The Russians became heavy produces of both sunflower oil and seeds. This heirloom giant Russian sunflower produces huge solitary giant flowers on top of strong stalks. The seeds are edible (by both birds and humans). Most/full sun - Annual - 6-7 feet - 25 seeds/pack.