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Giant Sunflower Seeds for Planting Heirloom & Non-GMO

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15 seeds

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Mammoth Grey Stripe Sunflower Color: Bright yellow sunburst petals with deep yellow-orange seeds and deep green foliage.

Growing Info:

Hardiness Zone:Annual; Zones 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
Days to Maturity:90-110
Days to Germination:4-10
Seeding Depth:0.5 inches
Plant Spacing:18 inches
Row Spacing:18 inches
Plant Height:108-114 inches
Growth Habit:Upright stalk with a large flower head on top.
Soil Preference:Average, rich, loamy, and well-drained soil.
Temperature Preference:50-85 F
Light Preference:Full Sun

Frequently asked questions

Answers to the questions shoppers ask most about this item.

How long do the seeds take to germinate?
The seeds typically take 4–10 days to germinate.

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05/25/2026

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