More Information
| Botanical Name |
Helianthus annuus |
| Seeds Per Pack |
25 |
| 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 |
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.
