Flower / Warm season
Grandiflora Petunia
Hanging baskets, patio containers, and warm-season annual borders.
Grown for large colorful blooms, not edible harvest.
Seed spacing and maturity
- Days to maturity
- 85
- Germination temperature
- 70-80F
- Seed depth
- 0.125 inches
- Spacing
- 12 inches
- Row spacing
- 18 inches
- Start method
- Start indoors
Frost-date timing
- Indoor start
- 10 weeks before last frost
- Transplant
- 14 days after last frost
Growing profile
- Sun
- Full sun
- Water
- Moderate water with good drainage in containers and beds.
- Soil
- Light, fertile, well-drained soil or container mix.
- Watch
- Seed is tiny and slow; do not bury deeply.
- annual
- containers
- transplant
- warm-season
Browse context
- Flower Catalog Category collection
- Nightshade Family Rotation and family context
- Warm Season Seeds Season collection
- Start Indoors Seeds Start-method collection
- Container-Friendly Seeds Practical trait collection
Related varieties
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- Black Beauty Eggplant Nightshade family · Warm season · 80 days
- Black-Eyed Susan Aster family · Warm season · 90 days
- Chief Mix Celosia Amaranth family · Warm season · 90 days
- Envy Edamame Soybean Legume family · Warm season · 80 days
Source: UMN starting seeds indoors