Delphinium Summer Colors Seeds

Delphinium Summer Colors Seeds produce profusely branching, compact plants with abundant flowers in a range of colours.

Grow Guide: How to grow Summer Colors delphiniums from seed in South Africa.

Quick Grow Facts

• Plant Type: Compact first-year-flowering perennial, often used as a seasonal bedding or container plant
• Scientific Name: Delphinium grandiflorum
• Seed Form: Raw seed
• South African Sowing Time: Sow in a mild window; avoid frost and extreme heat during establishment and flowering
• Position: Full sun in cool conditions; partial shade in hot districts
• Sow Depth: Loose 3 mm cover of fine vermiculite; do not use dense potting mix
• Light: The breeder requires a light cover but does not state a strict light/dark requirement; provide bright light after emergence
• Germination: Approximately 14–21 days at 20–22°C
• Prechill: Not required by the current breeder protocol
• Spacing: Approximately 25 cm
• Height: Approximately 20–35 cm
• Flowering Time: Current breeder spring crop time is approximately 16–20 weeks; local timing varies
• 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 to the packet's 3 mm depth and maintain 20–22°C.
• Keep evenly moist through emergence, then provide bright light and airflow.
• Do not refrigerator-prechill this supplied seed. 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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