Sweet William (Dianthus barbatus 'Heart Attack') is a short-lived perennial typically grown as a biennial or annual, prized for its dense clusters of fragrant, showy flowers that bloom from May through June. Hardy in zones 3 through 9, this cottage garden classic grows 9 to 12 inches tall and produces vivid flowers in red, pink, white, and bicolor combinations, often with contrasting eyes and fringed, bearded petals. Many modern cultivars, including this one, will flower the first year from seed if started early indoors, though they perform most reliably in their second season. Deer leave it alone, and butterflies and hummingbirds flock to its nectar-rich blooms.
6
Full Sun
Moderate
3-9
12in H x 9in W
—
High
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The flowers arrive in dense, flat-topped clusters that practically glow with color from late spring into early summer, and they're fragrant enough to perfume a garden bed. This compact cultivar reaches just 9 to 12 inches tall, so it tucks neatly into borders, containers, or cottage garden schemes without overwhelming neighboring plants. The combination of deer resistance and pollinator magnetism means you get a lively garden without the frustration of constant replanting.
Sweet William shines as a bedding plant and border flower, filling garden spaces with reliable color and fragrance from late spring through early summer. It also makes an excellent cut flower, with long-lasting clusters suitable for bouquets and arrangements. Many gardeners grow it specifically to attract butterflies and hummingbirds to their gardens.
No timeline data available yet for this variety.
Start seeds indoors 6 to 8 weeks before your last spring frost in a fertile potting mix. Maintain soil temperature between 65 and 75 degrees Fahrenheit for germination. Pot seedlings into 3 to 4 inch containers 3 to 4 weeks after sowing, being careful not to over or underwater. This early indoor start allows many modern cultivars to flower the first year.
Harden off seedlings gradually before moving them outdoors after the last frost date. Transplant into beds or containers with rich, well-drained soil, spacing plants 6 inches apart. In fall, you can also plant nursery-grown plants or direct-sown seed for bloom the following year.
Direct sow seed in the garden in early fall for bloom the following spring and summer. Seeds can also be started in cold frames in early spring for first-year flowering.
Deadhead spent flower clusters regularly to extend the blooming season and promote a tidier appearance. This encourages the plant to redirect energy into producing more flowers rather than setting seed.
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