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Common lilac
Habit (mature) · Hswaton / Wikimedia Commons · CC BY-SA 3.0
Limited coverage
Common lilac
Syringa vulgaris
An upright, multi-stemmed, suckering deciduous shrub in the olive family, grown for its intensely fragrant mid-to-late-spring (May) bloom of lilac-purple flowers in large conical panicles. Native to southeastern Europe and cultivated in North America since the early 1600s, it matures to 12-16 feet tall with blue-green, pointed-ovate to heart-shaped leaves. It needs cold winters and cool summers — and offers few ornamental features after bloom, with leggy form, no fall color, and summer powdery mildew.
Review: Source-backed
Climate fit: narrow (38/100)
Focal point
Structure
Border
Light
Full sun / Part shade
Water
Moderate water
Mature size
144-192" tall · 120" apart
Hardy in zones
3a-7b
brutally cold to cold winters
Summer heat range
Cool-Mild
cool to mild 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)
Marginal
In plain terms: cold winters — coldest nights typically around -3°F.
✓→⚠
Well-suited today, but likely marginal by 2050.
Heat tolerance
Loading current AHS heat-zone and plant heat-fit data at your coordinates…
Where this plant fits
Suitable across 34 ecoregions — 26 climate-resilient through 2070 · 8 suited today. Best matches first.
Appalachian mixed mesophytic forests
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Appalachian-Blue Ridge forests
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Arizona Mountains forests
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Blue Mountains forests
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Canadian Aspen forests and parklands
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Central Tallgrass prairie
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Central-Southern Cascades Forests
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Colorado Rockies forests
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Cross-Timbers savanna-woodland
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Eastern Canadian Forest-Boreal transition
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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). Common lilac (Syringa vulgaris). Retrieved 2026, June 5, from https://plotwright.garden/plants/common-lilac
Sources for every fact
Every fact on this page traces to a source. 18 fields cited — 18 source-backed.
Missouri Botanical Garden PlantFinder
Botanical research database
Backs 17 fields
Identity
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Wikimedia Commons
Photo · CC BY-SA 3.0
Backs 1 field
Image
Community photos
The photos above are our reviewed reference set, curated for accuracy.
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