80 days. For seed production. 10 to 12 inch heads on plant 6 feet tall or more. Thin-shelled, striped seeds are plump and meaty.
Package contains 10 grams, approximately 100 Sunflower, Mammoth Grey Stripe Annual Seeds.
Learn more about Mammoth Grey Stripe Sunflower in this blog post
Germination: 5 to 10 days at 68 to 72 F. Cover seeds completely with soil. Water well and keep moist until sprouted.