Sunflower Seeds - Mammoth Grey Stripe
$3.25
Helianthus annuus
Long-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.- Planting Information
- Growing Information
Min. Seeds per Packet | Average packet weight | Seeds / gram | Average seed / oz |
| 18 | 2 grams | 8 | 240 |
| 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 | Days to Harvest |
| Transplant or Direct Seed | 1" | 4-16" | 90-100 |
| Mature Spacing | Days to Sprout | Production Cycle | Seed Viability |
| 8-12" | 5-12 | Annual | 4-6 years |
Site Selection
Sunflower is a frost sensitive annual that prefers full sun and well-drained soil with low to moderate moisture. Drought tolerant once established.
Planting
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.