Mammoth Grey Stripe
Mammoth Grey Stripe unfurls with a statuesque presence—heads that seem carved from dusk, their petals catching light in soft, smoky tones. The blooms carry bold, slate-edged striping that deepens as the season advances, offering a dramatic, long-lasting show in the garden while producing abundant seed for collectors and growers. Expect sturdy, upright plants with a commanding silhouette that thrives with steady sun and rewards with striking, gallery-worthy flowers.
Crop Dates
| Milestone | Date |
|---|---|
| Last Frost | Jun 15th |
| Growing Approach | Protected Environment Only |
Crop Details
| Trait | Value |
|---|---|
| Days to Maturity | 90 |
| Sun Requirements | Full Sun |
| Growth Habit | Upright |
| Support Needed | None |
| Planting Depth | Normal |
| Germination Temp (°F) | 70 |
| Min Soil Temp (°F) | 55 |
| Min Night Temp (°F) | 40 |
| Harden Off (days) | Not Required |
Recommended Companions
Frequently Asked Questions
How often should I water Helianthus annuus during the main growing phase?
How can I tell when Helianthus annuus ‘Mammoth Grey Stripe’ is ready to harvest?
Mammoth Grey Stripe unfurls with a statuesque presence—heads that seem carved from dusk, their petals catching light in soft, smoky tones. The blooms carry bold, slate-edged striping that deepens as the season advances, offering a dramatic, long-lasting show in the garden while producing abundant seed for collectors and growers. Expect sturdy, upright plants with a commanding silhouette that thrives with steady sun and rewards with striking, gallery-worthy flowers.
Sowing Tips
Soil Temperature
Direct sow or transplant when soil at planting depth holds 55°F for reliable germination and early growth.
Expert Note
Sow where you want the flowers to grow (or direct-sow early) because sunflower taproots don’t like transplanting, and tall plants need space for airflow.