Black Mammoth - Organic Sunflower Seeds

SKU: FSU103

Open-Pollinated

Certified Organic

$4.50

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Packet 50 seeds

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Black Mammoth is a towering sunflower known for its dense heads packed with rich black seeds. Blooms can reach up to 12 inches across, perched on strong stalks that grow 10 feet tall or more. It’s a bold, functional variety—great for feeding birds, saving seed, or adding a striking vertical element to the garden. Originally bred for seed yield, it still turns heads with its sheer scale. Plant in full sun and give it room to stretch—this one’s made for the back row.

How to Grow

Plant seeds directly in the garden after average last frost date when soil has warmed up. Optimum soil temperature for seed germination is 60-75°f. Succession plantings can be made every 1-2 weeks for continued harvest. Or, start seed indoors 3-5 weeks before transplanting into the garden. Transplant to the garden 1-2 weeks after your average last frost date. Sunflower is sensitive to transplant shock so carefully set in the garden.

Growing Specs

Scientific name: helianthus annuss
Days to maturity: 85-95
Seed depth: 1/2"
Days to sprout: 10-14
Plant spacing: 18-24"
Row spacing: 24-36"
Light requirements: sunny
Plant height: 8-10'
Life cycle: annual
Frost hardy: no

NON-GMO

Open-pollinated seeds perfect for seed saving

HIGH QUALITY

Third-party lab tested to ensure strong germination and seed vitality

100% SATISFACTION

We'll make it right if there's a problem

HAND PACKED

Created with love in Pottstown, PA

ORGANIC SEED

140+ Organic and Certified Naturally Grown varieties available

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