Sweet William is a classic biennial cottage garden dianthus that fills summer borders with fragrant, long-lasting flower clusters in shades of white, pink, magenta, and deep red. Hardy in zones 3 through 5, these plants reach 24 inches tall and bloom most abundantly in their second year, making them a patient gardener's reward. The flowers are exceptional as cut arrangements, holding their color and fragrance for weeks in a vase. Starting from seed indoors 6 to 8 weeks before your last spring frost gives you sturdy transplants ready to establish strong root systems before blooming season.
Full Sun
Moderate
3-3
24in H x 6in W
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Moderate
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The fragrance alone makes Sweet William worth the space in your garden. Dense, clustered blooms in jewel tones emerge reliably in year two, and they last remarkably long both on the plant and in cut arrangements. Plant them in rich soil with full sun and a bit of afternoon shade during hot summers, and you'll have dependable color that self-seeds readily for future seasons without much fuss.
Sweet William flowers are prized for cutting and displaying indoors, where their fragrance and longevity make them stand out among garden flowers. The dense flower clusters also brighten cottage gardens and formal borders, adding vertical interest and romantic charm to mixed plantings.
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Sow seeds indoors 6 to 8 weeks before your last spring frost in fertile potting mix. Maintain a soil temperature of 65 to 75 degrees Fahrenheit for reliable germination. Pot seedlings into 3 to 4-inch containers 3 to 4 weeks after sowing, being careful not to overwater or underwater during this critical stage.
Harden off seedlings by gradually exposing them to outdoor conditions over 7 to 10 days. Transplant into the garden after your last spring frost when soil has warmed. Space plants 6 inches apart with rows set 12 inches apart to provide good air flow around the base of each plant.
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