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Clematis
Habit (mature) · Cephas / Wikimedia Commons · CC BY-SA 4.0
Limited coverage
Clematis
Clematis (hybrid)
The classic large-flowered garden clematis — represented here by the iconic Jackman hybrid (Clematis x jackmanii), a deciduous twining vine bred in England in 1858 and still the benchmark for the group. It carries an abundance of showy, four-sepaled violet-purple flowers 5-7 inches across from mid summer, climbing 7-10 feet on a trellis, arbor, or fence. The classic gardener rule applies: roots in cool shade, flowers in the sun.
Review: Source-backed
Climate fit: moderate (58/100)
Focal point
Pollinator
Structure
Light
Full sun / Part sun / Part shade
Water
Moderate water
Mature size
84-120" tall · 36" apart
Hardy in zones
4a-9b
very 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). Clematis (Clematis (hybrid)). Retrieved 2026, June 5, from https://plotwright.garden/plants/clematis
Sources for every fact
Every fact on this page traces to a source. 18 fields cited18 source-backed.
Missouri Botanical Garden PlantFinder
Botanical research database
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
NC State Extension Gardener Plant Toolbox
University extension service
Community photos
The photos above are our reviewed reference set, curated for accuracy.
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