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Delphinium Summer Colors Seeds produce profusely branching, compact plants with abundant flowers in a range of colours.
Growing compact Summer Colors blooms? Follow our Delphinium Grow Guide for a fine seed cover, cool-season sowing and compact border care.
Quick Grow Facts
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Plant Type: Compact first-year-flowering perennial, often used as a seasonal bedding or container plant
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Scientific Name: Delphinium grandiflorum
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Seed Form: Raw seed
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South African Sowing Time: Sow in a mild window; avoid frost and extreme heat during establishment and flowering
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Position: Full sun in cool conditions; partial shade in hot districts
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Sow Depth: Loose 3 mm cover of fine vermiculite; do not use dense potting mix
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Light: Keep the fine cover in place; provide bright light after emergence
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Germination: Approximately 14–21 days at 20–22°C
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Prechill: Routine refrigerator prechilling is unnecessary
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Spacing: Approximately 25 cm
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Height: Approximately 20–35 cm
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Flowering Time: Professional spring crops may take approximately 16–20 weeks; local timing varies
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Flower Outcome: Compact, branching mixed-colour display for beds and containers
Why Grow This Variety
- Compact, branching growth provides colour without taking up much space.
- The Summer series is early to flower.
- The compact series flowers in its first year, but extreme heat above approximately 29°C can abort flowers.
- Plants suit flower beds and containers.
Garden Uses
Use Summer Colors in sunny flower beds or containers where its compact growth form can provide a dense display.
Growing Notes
- Cover with loose fine vermiculite approximately 3 mm deep and maintain 20–22°C.
- Keep evenly moist through emergence, then provide bright light and airflow.
- Routine refrigerator prechilling is unnecessary. Pot on after true leaves and harden gradually.
- Space about 25 cm apart and avoid flowering temperatures above approximately 29°C.
- All parts, including seed and seedlings, are toxic if swallowed. Keep away from children, pets and livestock and seek prompt medical or veterinary advice after suspected ingestion.
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