Organic Russian Mammoth Sunflower Seeds: Non-GMO, Certified Organic Heirloom Seed Packet Packet: 3 grams, ~25 seeds Non-GMO, Certified Organic Heirloom Variety 80 days from seed to flower. Annual. Grow from mid-spring to early fall in most climate A Quality Variety with Vigorous Yield Potential. Plant Good Seed. Know the Source.