Dianthus Barbatus Sweet William
Dianthus barbatus
2-4" clusters of single-petaled, coral-pink blooms on long, strong stems. Compared to the Sweet™ series, blooms are wider, flatter, less globe-shaped, and have more of an umbel form. Plant vernalization is not required to initiate flowering. Fragrant blooms. Plants are high-yielding, producing long-lasting blooms, up to 14 days. Tender perennial in Zones 6-8. Raw, uncoated seed.
Harvest
100-105d
Days to harvest
Sun
Cottage Garden in Shade Retaining Wall Garden
Zones
3–9
USDA hardiness
Height
12-24 inches
Planting Timeline
Showing dates for Dianthus Barbatus Sweet William in USDA Zone 7
All Zone 7 flower →Zone Map
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Dianthus Barbatus Sweet William · Zones 3–9
Growing Details
Zone-by-Zone Planting Calendar
| Zone | Indoor Start | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 3 | April – May | June – July | June – August | — |
| Zone 4 | March – April | June – June | June – July | — |
| Zone 5 | March – April | May – June | May – July | — |
| Zone 6 | March – April | May – June | May – July | — |
| Zone 7 | February – March | April – May | April – June | — |
| Zone 8 | February – March | April – May | April – June | — |
| Zone 9 | January – February | March – April | March – May | — |
| Zone 10 | January – January | February – March | February – April | — |
Complete Growing Guide
Light: Cottage Garden in Shade Retaining Wall Garden. Soil: High Organic Matter, Loam (Silt), Sand. Soil pH: Neutral (6.0-8.0). Drainage: Good Drainage, Moist. Height: 1 ft. 0 in. - 2 ft. 0 in.. Spread: 0 ft. 6 in. - 1 ft. 0 in.. Spacing: Less than 12 inches, 12 inches-3 feet. Growth rate: Medium. Maintenance: Medium. Propagation: Division, Seed. Regions: Coastal, Mountains, Piedmont.
Harvesting
The capsule is 1-celled, opening by 4 valves, the fruit is dry and splits open when ripe with numerous, shield-shaped blackish-brown seeds.
Color: Black, Brown/Copper. Type: Capsule. Length: < 1 inch. Width: < 1 inch.
Bloom time: Spring
Storage & Preservation
Fresh-cut Sweet William stems last 5-7 days in clean, cool water with floral preservative. Recut stems underwater every 2-3 days and change water completely. Store cut flowers in the refrigerator when not displayed to maximize longevity.
For dried arrangements, harvest flowers at peak bloom and hang small bundles upside down in a dark, well-ventilated space. The papery texture of the flower clusters makes Sweet William excellent for air-drying, retaining both color and form for 6-12 months.
Collect seeds for future plantings by allowing some flower heads to mature and dry on the plant until seed pods turn brown and papery. Store cleaned seeds in labeled envelopes in a cool, dry location—they remain viable for 3-4 years when properly stored.
History & Origin
Origin: European Mountains (Pyrenees, Carpathians, Balkans)
Advantages
- +Disease resistance: Deer, Heat, Humidity, Rabbits
- +Attracts: Deer and rabbit resistant
- +Wildlife value: Pollinated by Bees, Lepidoptera (Moths & Butterflies).
Considerations
- -Toxic (Leaves): Low severity
- -Causes contact dermatitis
Companion Plants
Plant Together
Lavender
Repels aphids and other pests while attracting beneficial pollinators
Marigold
Deters nematodes and aphids while providing complementary colors
Alyssum
Attracts beneficial insects and provides ground cover to retain soil moisture
Catmint
Repels ants and aphids while creating attractive color contrasts
Rosemary
Deters carrot flies and cabbage moths that may damage nearby plants
Salvia
Attracts pollinators and beneficial predatory insects
Yarrow
Improves soil health and attracts beneficial insects for pest control
Pansies
Similar growing requirements and bloom times create attractive combinations
Keep Apart
Black Walnut
Produces juglone toxin that inhibits growth of many flowering plants
Eucalyptus
Releases allelopathic compounds that suppress growth of nearby plants
Fennel
Inhibits growth of most garden plants through allelopathic root secretions
Nutrition Facts
Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #169270)
Pests & Disease Resistance
Resistance
Generally disease resistant, prefers cool weather
Common Pests
Aphids, spider mites, thrips
Diseases
Crown rot, rust, fusarium wilt in hot, humid conditions