Sunflower - Mammoth Grey Stripe
Helianthus annuusLong-blooming, large-headed, archetypal giant sunflower. Easy-to-grow. Sturdy 6-12' stalks with big yellow-petaled flowers. Often grown for their meaty seeds, good for roasting or bird seed. Direct seed in full sun after danger of frost. Summer-fall blooming. Annual.
|Average Seed / oz||Seed / 100' Row||Average Yield / 100' Row||Days to Harvest|
|Planting Season||Ideal Soil Temp||Sun||Frost Tolerance|
|After Last Frost||65-85°F||Full Sun||Frost Sensitive|
|Sowing Method||Seed Depth||Direct Seed Spacing||Seeds Per Packet|
|Transplant or Direct Seed||1"||4-16"||17|
|Mature Spacing||Days to Sprout||Production Cycle||Seed Viability|
Sunflower is a frost sensitive annual that prefers full sun and well-drained soil with low to moderate moisture. Drought tolerant once established.
Direct seed outdoors once the danger of frost has passed. Optimum soil temperature for germination is 65-85˚F. Sow 1" deep and 4-6" apart. Seeds will sprout in 5-12 days. Thin so mature plants are 8-10" apart.