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 or transplant into the garden after all danger of frost has passed. Sunflowers will need full sun and well-draining soil. Water well to ensure good germination. Once germinated, sunflowers will need at least an inch of water per week. Typically grown for flowers. 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.