Description
Giant Single Mixed Sweet William Seeds 6645.
Vivid Early Blooms and Summer Heat Tolerance for Compact Borders.
Giant Single Mixed Sweet William (Dianthus barbatus) is an outstanding garden performer praised for its vivid early flowers and exceptional heat tolerance through the summer months. Reaching a compact height of 25 cm, it produces large, striking blossoms in brilliant shades of pink, rose, and deep red. Perfectly sized for front-of-border plantings, rockeries, and patio containers, this hardy biennial (often self-seeding to act like a perennial) returns year after year to fill sunny garden beds with rich colour and sweet perfume.
Quick Seed Details
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Product Code: 6645
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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: 25 cm
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Plant Spacing: 15 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
Sweet William requires adequate soil moisture during the germination period for reliable establishment.
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Indoor Sowing: Start seeds indoors in a soilless medium 8 weeks before your last expected spring frost. Sow seeds 3 mm deep and maintain a temperature of 21°C for the 10 to 20 day germination period. Move seedlings to a slightly cooler location under lights once sprouted, then harden off and transplant outdoors after the risk of frost passes.
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Outdoor Direct Sowing: Direct sow seed outdoors in a sunny spot from mid- to late May for flowering the following spring and summer. Cold frames can also be used for early sowing in April and May.
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Garden Spacing: Space plants 15 cm apart in well-drained soil.
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Maintenance: Allow flower heads to mature at the end of the season if you wish to let the plants naturally self-seed for perpetual year-after-year blooms.
Why Giant Single Mixed Sweet William Seeds belong in Your Garden
If you want compact, dependable, early-season colour that stands up to mid-summer heat, Giant Single Mixed Sweet William is a classic selection. Its brilliant pink-to-red palette, compact height, and reliable self-seeding nature make it a low-maintenance staple for cottage gardens and formal borders.
