https://www.herewegrowgardens.com/how-to-grow-tall-sunflowers-for-edible-seeds/

Grow your own edible sunflower seeds. Survival Food. Beautiful, Giant Sunflowers with large, plump seeds. Packet contains 30 seeds. Price includes shipping.

Mammoth Black Seed – 6-10 ft high -12- 14″ heads – bigger seeds – bigger heads – shorter plants

The Mammoth Grey Stripe is  – 10-12 feet high with 10-12 inch heads – Taller with smaller heads

https://www.herewegrowgardens.com/how-to-grow-tall-sunflowers-for-edible-seeds/