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Petunia Ultra Star Mix Seeds produce ruffled, star-patterned grandiflora flowers on compact, mounded upright plants for sunny borders and containers.
Grow Guide: How to grow Petunia Ultra Star Mix from seed in South Africa.
Quick Grow Facts
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Plant Type: F1 grandiflora petunia, grown as a frost-tender annual
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Scientific Name: Petunia grandiflora
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Seed Form: Pelleted seed; sow one pellet per cell
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South African Sowing Time: Start protected trays about 8–10 weeks before safe planting-out weather; use the regional guide for local timing
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Position: Full sun; light afternoon relief only during severe heat
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Sow Method: Surface-sow on pre-moistened fine mix, press into contact and do not cover; bright light supports home germination
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Pretreatment: None; mist thoroughly so the pellet coating softens
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Germination: Usually 7–10 days at 22–24°C; controlled breeder trays may be faster
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Spacing: 35–40 cm
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Growth Form: Compact, mounded and upright
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Height: 30–35 cm
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Spread: 35–40 cm
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Flowering: Usually about 10–14 weeks from sowing in well-managed home conditions
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Current Packet Options: 50 pelleted seed, 1000 pelleted seed
Why Grow This Variety
- Ruffled blooms add texture and depth.
- Star patterns create a distinctive mixed display.
- Flowers reach approximately 7 cm wide.
- Generous spreading growth fills planting spaces.
Garden Uses
Use Ultra Star Mix in full-sun borders, containers or hanging baskets where its patterned flowers can create a lush seasonal display.
Growing Notes
- Use clean, fine, freely drained seedling mix. Surface-sow and mist the pellet until its coating softens; never bury it.
- Keep the surface evenly moist and humid only until emergence, then provide bright light and airflow.
- Move seedlings at about three true leaves and harden them gradually for 7–10 days before planting outside.
- Plant at the exact spacing above in fertile, freely drained soil and water at the root.
- Protect the large grandiflora blooms from persistent rain and give plants full sun in mild weather.
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