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Japanese Stewartia

Japanese Stewartia

Stewartia pseudocamellia
Japanese stewartia is a deciduous tree native to the forests of southern Japan (Honshu, Kyushu, Shikoku) and Korea, introduced to Western cultivation in 1874 and a holder of the RHS Award of Garden Merit. It delivers four-season interest: camellia-like white flowers with orange anthers in summer, rich red-to-purple autumn colour, and exfoliating bark in mottled orange, green, and grey that is the tree's most distinctive winter asset. The honest catch is establishment: stewartia is slow to settle in, resents transplanting once mature, and demands consistently moist, well-drained acidic soil — site it carefully the first time because it does not forgive relocation.
Climate fit: narrow (30/100)
Focal point
Structure
Light
Full sun / Part sun
Water
Consistent moisture
Mature size
240-480" tall · 240" apart
Hardy in zones
5a-8b
very cold to frosty winters
Native in Illinois
No

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Strictly ornamental.

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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Educator packet

Plant packet
Japanese Stewartia educator packet
Japanese stewartia is a deciduous tree native to the forests of southern Japan (Honshu, Kyushu, Shikoku) and Korea, introduced to Western cultivation in 1874 and a holder of the RHS Award of Garden Merit. It delivers four-season interest: camellia-like white flowers with orange anthers in summer, rich red-to-purple autumn colour, and exfoliating bark in mottled orange, green, and grey that is the tree's most distinctive winter asset. The honest catch is establishment: stewartia is slow to settle in, resents transplanting once mature, and demands consistently moist, well-drained acidic soil — site it carefully the first time because it does not forgive relocation.
Scientific name
Stewartia pseudocamellia
Plant type
tree
Hardiness
5a-8b
Light
full-sun, part-sun
Moisture
consistent
Spacing
240 inches
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. To cite a single upstream fact instead, use its specific source listed below.
Plotwright. (2026, May 17). Japanese Stewartia (Stewartia pseudocamellia). Retrieved 2026, June 30, from https://plotwright.com/plants/stewartia-pseudocamellia
Sources for every fact
Every fact on this page traces to a source. 18 fields cited - 18 source-backed.
RHS Find a Plant
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
GBIF
Botanical research database
Wikipedia (ecoregion articles)
Botanical research database