Skip to content
Heirloom
★ Best Seller
Non-GMO
Russian Mammoth Heirloom Sunflower
$4.50
Packet - 25 Seeds
Flat $7.99 shipping
Germination guaranteed
Non-GMO
Not sure when to plant in your area?
Planting dates depend on your local frost dates and growing zone.
Shop by Zone
Quick Facts
Days to Maturity80 days
SunlightFull Sun
Spacing18–24 in.
Germination7–10 days
Growing Information
Growing Russian Mammoth Heirloom Sunflower
‘Russian Mammoth’ is an heirloom, open-pollinated sunflower prized for its extraordinary height, enormous blooms, and commanding garden presence. Giant flower heads can reach 10 to 14 inches across on plants that average 10 to 12 feet tall and may reach heights of up to 16 feet under favorable conditions.
Plant ‘Russian Mammoth’ seeds about 1 inch deep and space plants 18 to 24 inches apart. Grow in full sun. Germination typically takes 7 to 10 days. This heat- and drought-tolerant variety performs especially well during warm summer conditions.
Ready to bloom in about 80 days, enjoy the enormous flowers as they open and reach their best display stage. Strong stems also provide impressive blooms for bold seasonal arrangements.
Towering, dramatic, and unforgettable, ‘Russian Mammoth’ is an excellent choice for back-of-border plantings, garden screens, cut flowers, and pollinator-friendly gardens.
- Sun: Full Sun
- Bloom Size: 10 - 14 Inches
- Stem Length: 18 - 24 Inches
- Height: 10 - 16 Feet
- Hardy Annual
Catalog Page: 77
Sowing depth
1 in.
Plant height
10 - 16 Feet
Botanical name
Helianthus annuus
Questions
FAQ
How deep should I sow the seeds?
Sow at a depth of 1 in.
How long until they germinate?
Typical germination: 7–10 days.
How far apart should I space them?
Recommended spacing: 18–24 in..
How much sun do they need?
Recommended sun exposure: Full Sun.
What’s your germination guarantee?
We stand behind the germination quality of our seed. If you have a germination issue, contact our team and we'll help make it right.
Russian Mammoth Heirloom Sunflower$4.50 · Packet - 25 Seeds
REAL GARDENERS, REAL RESULTS