Grow guide
How to grow Mammoth Sunflower
Helianthus annuus
- Type
- Sunflower
- Zones
- USDA zones 4–9
- Sun
- Full
- Time to harvest
- 90–120 days
- Spacing
- 24″ apart
- Density
- 1 per sq ft
- Habit
- Upright
- Frost tolerance
- Tender
- Sowing
- Direct sow
- Start indoors
- 0 weeks before last frost
Care
- Harvest Once
- Fertilize Once at planting
- Water Deep weekly
Notes
12+ ft tall, huge seedheads. Sow May in 7B.
More sunflower varieties
Grows well nearby
Track Mammoth Sunflower from seed to harvest with Evengrow.
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