A towering heirloom, Mammoth is one of the oldest, most beloved sunflower varieties. Sky-high 12' plants with huge heads are supported by great, sturdy trunks. Ready to attract pollinators and turn heads in the neighborhood! Harvest hundreds of edible seeds in 100 days. Loved by gardens and trusted by gardeners, Burpee© has been introducing fresh garden breakthroughs since 1876. Burpee offers only the highest quality, non-GMO seeds, hand-picked by expert horticulturalists to thrive in your home garden.