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Sweet William
Habit (mature) · GT1976 / Wikimedia Commons · CC BY-SA 4.0
Limited coverage
Sweet William
Dianthus barbatus
A classic cottage-garden member of the pink family (Caryophyllaceae), native to the European mountains (Pyrenees, Carpathians, Balkans). NC State Extension describes a dense, erect, rounded plant 1-2 feet tall and 6-12 inches wide, with narrow lance-shaped, grayish- to blue-green leaves and flat, rounded, dense clusters of fragrant, often bicolor flowers in shades from white through intense red and purple in spring. It can be grown as an annual, biennial, or short-lived perennial; this record treats it as the short-lived perennial it is across its USDA zone 3-9 range. Bees and butterflies work the bloom clusters, and the plant is deer and rabbit resistant.
Review: Source-backed
Climate fit: moderate (65/100)
Border
Pollinator
Filler
Light
Full sun / Part shade
Water
Moderate water
Mature size
12-24" tall · 9" apart
Hardy in zones
3a-9b
brutally cold to frosty winters
Summer heat range
Cool-Hot
cool to hot summers Interim Plotwright tier until the plant AHS range is authored.
Native in Illinois
No
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Cold hardiness
Now
Zone 6b
USDA
Chicago, IL · 1991-2020 average annual coldest day
Source: USDA Plant Hardiness Zone Map 2023 (1991-2020 climatology) via ArcGIS FeatureServer
Well-suited
2050
Zone 7b
Plotwright
Your zone + climate-model shift · SSP3-7.0 (regional rivalry)
Well-suited
In plain terms: cold winters — coldest nights typically around -3°F.
Well-suited today and still thriving in 2050.
Heat tolerance
Loading current AHS heat-zone and plant heat-fit data at your coordinates…
Sources & citations
Cite this page
For lesson plans, articles, or research that uses this page. To cite a single upstream fact instead, use its specific source listed below.
Plotwright. (2026, May 17). Sweet William (Dianthus barbatus). Retrieved 2026, June 5, from https://plotwright.garden/plants/sweet-william
Sources for every fact
Every fact on this page traces to a source. 18 fields cited18 source-backed.
NC State Extension Gardener Plant Toolbox
University extension service
Backs 17 fields
Identity
Summary
Plant type
Light
Moisture
Hardiness
Heat zone
Size
Spacing
Habit
Design roles
Seasonal interest
Growth stages
Lifecycle
Regional guidance
Success tips
Designer notes
Wikimedia Commons
Photo · CC BY-SA 4.0
Backs 1 field
Image
Community photos
The photos above are our reviewed reference set, curated for accuracy.
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