The largest sunflower seeds come from the largest sunflowers, known as "giant sunflowers" or "mammoth sunflowers." Several different sunflower types fall into this category, growing as high as 16 feet with flowers that can be as much as 3 feet in diameter. Some species can produce as many as 5,000 seeds from one single flower head. All sunflower seeds are edible, but the largest sunflowers and their seeds are cultivated for the quantity and quality of the seeds produced.
Sunzilla is one of the largest sunflowers, producing huge seeds. The flowers grow from 12 to 16 feet high when they are planted well and protected from birds. Seeds should be planted directly in the garden in full sun, rich soil and when danger of frost has past. Protect the seedlings from birds with netting and then replant the seedlings 12 to 18 inches apart.
Titan is a Russian heirloom sunflower variety. It will grow to heights of 12 to 14 feet and the flower heads can be as large as 24 inches in diameter. The seeds can be planted directly in the garden at a depth of 1 inch. They will need to be spaced at least a foot apart to allow room for them to grow to their full size.
American Giant Hybrid
This hybrid sunflower can also grow to 16 feet in height but its blossoms are smaller than some of the other mammoths, at just 10 inches in diameter. Still, it is popular because of the large leaves and seeds that it produces.
Skyscraper is another mammoth sunflower that can grow to 12 feet in height. The flower heads will grow up to 14 inches in diameter. The plant is favoured for its large, tasty seeds.
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