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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
4-6 ft tall · 5 ft apart
Hardy in zones
3a-8b
brutally cold to frosty winters
Life cycle
Perennial
Bloom period
Summer
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...

Similar plants

Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.
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Kolkwitzia amabilis
Beauty bush
A large, vigorous, fountain-shaped deciduous shrub that earns its common name in late spring, when its arching stems are smothered in masses of pale-pink, yellow-throated, bell-shaped flowers. Native to China, it is one of the great old-fashioned spring shrubs - spectacular in full bloom, much loved by bees, and offering peeling brown bark for quiet winter interest. It is also genuinely big: expect 6 to 10 feet tall and wide at maturity, so give it room rather than fighting its size with the shears. The form to seek out is the Award-winning "Pink Cloud", which carries a clearer, richer pink than the variable seed-grown species.
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Focal point
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Black chokeberry (Aronia melanocarpa) showing clusters of shiny black berries against dark green foliage.
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A drought-and-flood-tolerant native shrub of eastern North America with brilliant three-season interest - spring white-pink flowers, glossy black antioxidant-rich late-summer berries, and brilliant wine-red fall foliage - plus an extraordinarily wide cold-hardiness range (USDA 3a-8b). The berries are astringent fresh but the basis of a small but growing commercial industry (juices, wines, jams, supplements) for their exceptionally high anthocyanin content. Spreads by suckers; site where colony formation is welcome.
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Border
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Cape leadwort
A vigorous, scrambling, semi-climbing tender shrub that flowers almost without pause through the warm months, carrying broad clusters of soft sky-blue (or, in the white form, pure white) phlox-like flowers. Known as the Cape plumbago or Cape leadwort, it is native to South Africa (POWO, Kew) and is grown worldwide as an easy, long-flowering ornamental. The honest catch is its frost-tenderness: it is hardy only in USDA zones 9a-11, so in cold climates it is grown as a conservatory or large-container plant, or treated as a summer annual. Left to its own devices it climbs or sprawls 6 to 10 feet and needs support, or hard pruning, to keep its shape; the flower calyces are sticky and glandular and cling to clothing and animal fur (its own seed-dispersal trick), and it suckers. In return it is one of the best blue-flowered butterfly plants for a warm garden.
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Structure
Border
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Pollinator
Carolina allspice (Calycanthus floridus) growing as an open, multi-stemmed deciduous shrub in its native Appalachian woodland, showing the upright-arching branching habit.
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Full sun / Part shade
Moderate water
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Climate: broad
Pollinator
Structure
Border
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A native North American deciduous shrub with exfoliating bark (hence "ninebark"), white-to-pink spring flower clusters, papery red seedpods, and reliable fall color. Colored-foliage cultivars (Diabolo, Coppertina, Summer Wine) extend the design palette. Adaptable + drought-tolerant once established.
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Moderate water
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Structure
Border
Pollinator
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Hamelia patens
Firebush
Firebush (also called scarlet bush, hummingbird bush, and Mexican firecracker) is a fast-growing, evergreen, soft-stemmed shrub in the coffee family (Rubiaceae) and a Florida native: it grows wild from central Florida south through the Florida Keys, and on through the Bahamas, the Caribbean, Mexico, and Central America into South America as far as Argentina. In a frost-free landscape it forms a dense, spreading shrub of 6 to 12 feet, occasionally to 15 feet, with whorls of oval leaves that are red-hairy when young and speckled red or purple at maturity, reddish stems, and terminal clusters of slender, tubular, orange-red flowers 0.5 to 1.5 inches long nearly all year. Hummingbirds and butterflies work the flowers, and birds eat the small berries, which ripen from red to black and are edible. It is frost-tender: a freeze can kill it to the ground, it regrows from the roots through zone 9, and farther north it is grown as a 2 to 3 feet summer annual or container plant. Buy with care, because several non-native firebushes are sold under the same name: plants labeled 'African', 'Dwarf', 'Compacta', or 'Firefly' are often Hamelia patens var. glabra, a variety from southern Mexico to northern South America with smooth leaves and mostly yellow flowers, and 'Bahama firebush' is a different species, Hamelia cuprea. Florida's native form is Hamelia patens var. patens, the plant this record describes.
Shrub
Full sun / Part shade
Moderate water
Zones 9a-11b
Climate: narrow
Pollinator
Border
Structure
Focal point
Container

Educator packet

Plant packet
Japanese spirea educator packet
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.
Scientific name
Spiraea japonica
Plant type
shrub
Hardiness
3a-8b
Light
full-sun, part-shade
Moisture
moderate
Spacing
5 ft
Classroom prompts
- Which plant traits are observations, and which are care recommendations?
- How would this plant fit change if the garden location moved warmer, colder, wetter, or drier?
- Which source-backed facts would you cite in a lesson handout?
Use the Sources & citations section below for page citation styles and the field-level source list.

Sources & citations

Cite this page
For lesson plans, articles, or research that uses this page. Use the source cards below to explore the references that informed this record.
Plotwright. (2026, May 17). Japanese spirea (Spiraea japonica). Retrieved 2026, October 9, from https://plotwright.com/plants/spiraea-japonica
Sources used for this record
This record is compiled from the sources below.
Missouri Botanical Garden PlantFinder
Botanical research database
Plants of the World Online (POWO)
Botanical research database
USDA PLANTS Database
Government data source
Wikimedia Commons
Photo · CC BY-SA 3.0
NC State Extension Gardener Plant Toolbox
University extension service