Delphinium Guardian Blue Seeds

Delphinium Guardian Blue Seeds produce rich blue flowers on tall spikes, with uniform blooming even under short days.

Growing tall Guardian F1 spikes? Follow our Delphinium Grow Guide for loose vermiculite cover, cool germination and support as stems grow.

Quick Grow Facts

• Plant Type: F1 cool-season perennial, commonly managed as an annual cut-flower crop
• Scientific Name: Delphinium elatum
• Seed Form: Raw seed
• South African Sowing Time: Late summer to autumn in mild climates; protected late-winter sowing where severe frost is a risk
• Position: Full sun in cool conditions; morning sun and afternoon protection in hot districts
• Sow Depth: Uniform, loose coarse-vermiculite cover, approximately 1 mm
• Light: Optional during germination; provide bright light immediately after emergence
• Germination: Approximately 7–14 days at 18–21°C
• Prechill: Not required
• Spacing: About 25–35 cm in gardens or managed cut rows
• Height: Approximately 76–99 cm; support recommended
• Flowering Time: Professional crops may finish about 16 weeks from transplant; local timing varies
• Harvest: Cut when the first one or two lower florets open or about 30% shows colour

Why Grow This Variety

• Uniform blooming supports a coordinated flower display.
• Flowering can be up to six weeks faster from transplant than traditional open-pollinated varieties.
• Tall flower spikes suit landscape planting and cut flower production.
• The variety is also suited to potted plant programmes.

Garden Uses

Use Guardian Blue in tall landscape planting, dedicated cutting rows or pots, and harvest the spikes for floral arrangements.

Growing Notes

• Cover uniformly with coarse vermiculite and maintain 18–21°C; light is optional during germination.
• Keep humidity high only until emergence, then provide bright light and airflow.
• Pot on before plugs become rootbound, harden gradually and plant at the spacing above.
• Water at soil level, feed moderately and install support before stems stretch.
• 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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