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Hundredfold Canada

Mammoth Grey Stripe Giant Sunflower 20 Heirloom Seeds - Helianthus annuus Attract Songbirds Song Birds and Honeybees Bees

Regular price $5.99 USD
Regular price Sale price $5.99 USD
  • The gigantic flowers are the center of attention in many neighborhoods
  • The 12-feet stem produces a one-foot diameter magnificent flower that is bold and bright
  • Seeds are welcome treats to songbirds. The giant seed heads could serve as live bird-feeders
  • Each package contains 20 heirloom seeds; Packed & shipped in Ontario
  • Hundredfold for sustainable growth: A trusted Canada-based brand since 2017
  • Photos are taken in our Toronto trial garden (USDA Zone 6)


Mammoth Grey Stripe Sunflower Helianthus annuus (120 days) is also known as the Giant Sunflower. The single stem can reach 12 feet tall and produce a large seed head. With bright and bold flowers, these giants attract many friendly creatures such as bumblebees and songbirds. It can also be a major site of attraction if grown on your front lawn.

If you want less attention, don’t grow them in the front yard. Instead, grow them in the backyard. Sunflowers are easy to grow. Start indoors for 3–4 weeks before the last frost or direct seed after frost, thin to at least 1' apart. Richer soil produces taller plants.