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Japanese spirea

Japanese spirea

Spiraea japonica
A dense, mounded deciduous shrub from Japan and China, grown for flat-topped corymbs of tiny pink flowers that cover the foliage from June into July above oval, sharply-toothed leaves. Easy and low-maintenance in full sun, it tolerates clay, deer, erosion, and urban conditions. It is also an aggressive self-seeder that has escaped gardens and naturalized across the eastern U.S., where several states list it as invasive.
Climate fit: moderate (62/100)
Structure
Border
Pollinator
Light
Full sun / Part shade
Water
Moderate water
Mature size
48-72" tall · 60" apart
Hardy in zones
3a-8b
brutally cold to frosty winters
AHS heat range
1-11
Plant range authored in AHS heat-zone terms.
Native in Illinois
No

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Showy flat-topped flower clusters that the Missouri Botanical Garden and NC State Extension both report attract butterflies.

Cold hardiness

These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.
Now
Zone 6b
Plotwright
USDA Zone 6b
-5°F to 0°F
Well-suited
Zone 7a
Plotwright
0°F to 5°F
Well-suited
In plain terms: This location has cold winters. Its winters are projected to keep warming through 2050.
Well-suited today and still thriving in 2050.

Heat tolerance

Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.
Loading AHS heat-zone data for this location...

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Moderate water
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Climate: moderate
Focal point
Structure
Border
Pollinator

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). Japanese spirea (Spiraea japonica). Retrieved 2026, June 24, from https://plotwright.com/plants/spiraea-japonica
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
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 3.0
Backs 1 field
Image
NC State Extension Gardener Plant Toolbox
University extension service