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Details
Mammoth Grey Stripe is an amazing giant heirloom sunflower with enormous blooms that are 10-15” across. The large yellow flowers with brown centers top plants 8-12’ tall and yield heavy loads of delicious seeds. Fast and easy to grow, these sunflowers are the most familiar and iconic of all the classic sunflowers.
Michigan Seeds and Plants grown on our farm, Renegade Acres, in Howell, MI!
Certified Organic by Oregon Tilth.
Additional Info
| Botanical Name | Helianthus annuus |
|---|---|
| Life Cycle | Annual |
| Min. Time to Germinate | 5 Days |
| Max. Time to Germinate | 14 Days |
| Depth to Sow Seeds | 1/2 in. |
| When to Sow | Indoors 2-4 weeks before last spring frost, Outdoors after all danger of spring frost is past |
| Growing Height | 10-12 ft. (3-3.6 m) |
| Plant Spacing | 24-36 in. (60-90 cm) |
| Hardiness | N/A |
| Sun Exposure | Full Sun |
| Danger | N/A |
| Bloom Color | Bright Yellow |
| Bloom Time | Mid-Summer |
| Foliage | Herbaceous, Velvet/Fuzzy-Textured |
| Other Details | Average Water Needs; Water regularly; do not overwater, Self-sows freely; deadhead if you do not want volunteer seedlings next season, This plant is attractive to bees, butterflies and/or birds, This plant is resistant to deer |
| Soil pH Requirements | 6.1 to 6.5 (mildly acidic), 6.6 to 7.5 (neutral), 7.6 to 7.8 (mildly alkaline) |
| Propagation Methods | From seed; direct sow after last frost, From seed; sow indoors before last frost |
| Seed Collecting | Allow seedheads to dry on plants; remove and collect seeds, Bag seedheads to capture ripening seed |
| Seeds Per Pack | 25 |
