Planting Depth: 1 inch
Seed Spacing: 12–18 inches
Row Spacing: 24–36 inches
Germination Time: 7–10 days
Days to Bloom: 80–90 days
Sun Requirements: Full Sun
Planting Tips:
Mammoth Grey Stripe sunflowers grow best in full sun and well-drained soil. Sow seeds directly outdoors after the danger of frost has passed. These tall sunflowers may benefit from spacing and protection from strong winds as they grow. Once mature, large seed heads attract birds and pollinators and can be harvested when the backs of the heads turn yellow and seeds begin to dry.
