Description
Super Duplex Mixed Sweet William Seeds 6650.
Extra Double Blooms with Old-Fashioned Charm for Cutting and Borders.
Super Duplex Mixed Sweet William (Dianthus barbatus) is a classic garden favourite specially selected by growers to produce an exceptionally high proportion of extra double flowers. Reaching 40 cm in height, these sturdy, upright plants are packed with dense flower heads in shades of red, pink, rose, and white starting in early summer. Bringing timeless old-fashioned charm and a light, sweet scent to sunny borders and cut-flower arrangements, this hardy biennial readily self-seeds to provide a lasting presence in your garden.
Quick Seed Details
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Product Code: 6650
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Botanical Name: Dianthus barbatus
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Type: Open-Pollinated Biennial / Self-Seeding Perennial
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Hardiness: Zone 3
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Height: 40 cm
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Plant Spacing: 25 cm
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Light Requirement: Full Sun
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Germination: 10–20 days at 21°C
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Seed Count: Approx. 500 seeds per packet (900 seeds per gram)
What you need to know to Plant & Grow
Super Duplex Sweet William establishes easily when given consistent moisture during germination.
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Indoor Sowing: Start seeds indoors in a soilless mix 8 weeks before your last expected spring frost. Sow seeds 3 mm deep and maintain a soil temperature of 21°C throughout the 10 to 20 day germination period. Move sprouted seedlings to a slightly cooler spot under grow lights before hardening off and transplanting outside after frost danger has passed.
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Outdoor Direct Sowing: Direct sow outdoors in a sunny spot from mid- to late May for blooms the following season. Seeds can also be sown in cold frames during April and early May.
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Garden Spacing: Space plants 25 cm apart in well-drained soil.
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Maintenance: Ensure adequate soil moisture during germination and early growth. Leave mature flower heads in place late in the season to encourage natural self-seeding.
Why Super Duplex Mixed Sweet William Seeds belong in Your Garden
If you love lush double blooms and classic cottage garden aesthetic, Super Duplex Mixed Sweet William is an ideal choice. Its taller 40 cm stems make it superior for cut-flower bouquets, while its exceptional hardiness and self-seeding habit ensure reliable performance year after year.
