Description
Pacific Giants Mixed Delphinium Seeds 6435.
Towering 150 cm Spires of Double Florets for Stately Border Backgrounds.
Pacific Giants Mixed Delphinium (Delphinium x cultorum) is a breathtaking open-pollinated classic celebrated for its towering, graceful flower spikes reaching an impressive 150 cm in height. Densely packed with large, 5 cm double florets, this variety offers a well-balanced blend of solid colours and striking bi-colours. Its attractive, mildew-resistant foliage maintains a clean look all season long, making it an ideal candidate for the background of sunny perennial borders. Cutting back spent stalks immediately after the first flush of spring blooms encourages a second flowering display later in the summer.
Quick Seed Details
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Product Code: 6435
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Botanical Name: Delphinium x cultorum ‘Pacific Giants’
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Type: Open-Pollinated Perennial
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Hardiness: Zone 4
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Height: 150 cm
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Floret Size: 5 cm double florets
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Light Requirement: Full Sun
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Soil Preference: Rich, moist, well-drained soil (Heat and drought tolerant once established)
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Germination: 10–20 days at 18°C (Benefits from 24-hour pre-sowing chill)
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Seed Count: Approx. 70 seeds per packet (350 seeds per gram)
What you need to know to Plant & Grow
Pacific Giants Delphinium seeds respond best to a brief cold treatment prior to indoor sowing.
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Indoor Sowing: Start seeds indoors 8 to 10 weeks before your last expected spring frost date. Chill seed in the refrigerator for 24 hours prior to sowing to break seed coat dormancy. Sow in a quality soilless starter mix and maintain a temperature of 18°C for the 10 to 20 day germination period. Move sprouted seedlings under grow lights and maintain cool temperatures of 15 to 18°C before hardening off and transplanting outdoors to a sunny location.
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Garden Spacing & Care: Space mature plants 45 to 60 cm apart in well-drained soil. Provide shelter from strong winds or stake tall flower stalks as they develop. Cut plants back heavily after the main flush of flowering finishes to stimulate fresh growth and a second bloom period in late summer.
Why Pacific Giants Mixed Delphinium Seeds belong in Your Garden
If you want dramatic vertical scale, rich bi-coloured double blooms, and reliable Zone 4 winter hardiness, Pacific Giants Delphinium is an essential choice. Its mildew-resistant foliage, ability to rebloom in late summer, and magnetic draw for hummingbirds and butterflies make it a classic favourite for Canadian cottage gardens.
