Flower / Warm season
Mammoth Sunflower
Back-of-bed height, pollinator forage, and bird seed.
Large edible seed heads after flowering.
Seed spacing and maturity
- Days to maturity
- 90
- Germination temperature
- 65-85F
- Seed depth
- 1 inches
- Spacing
- 18 inches
- Row spacing
- 30 inches
- Start method
- Direct sow
Frost-date timing
- Direct sow
- 7 days after last frost
- Succession interval
- repeat every 21 days
Growing profile
- Sun
- Full sun
- Water
- Deep water while establishing; drought tolerant later.
- Soil
- Average to fertile soil; stake in windy sites.
- Watch
- Tall plants need space; do not shade shorter vegetables.
- pollinators
- birds
- kids
- tall
Browse context
- Flower Catalog Category collection
- Aster Family Rotation and family context
- Warm Season Seeds Season collection
- Direct Sow Seeds Start-method collection
- Beginner-Friendly Seeds Practical trait collection
- High Pollinator Value Seeds Practical trait collection
- Succession Sowing Seeds Practical trait collection
Related varieties
- Black-Eyed Susan Aster family · Warm season · 90 days
- Chief Mix Celosia Amaranth family · Warm season · 90 days
- Greek Oregano Mint family · Warm season · 90 days
- Indian Summer Rudbeckia Aster family · Warm season · 90 days
- Munstead Lavender Mint family · Warm season · 90 days
- Tall Verbena Verbena family · Warm season · 90 days
Source: Seed Savers seed saving guide