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Ilex
Japanese Holly

Japanese Holly

Ilex crenata
Japanese holly is a dense, small-leaved evergreen shrub native to Japan, Korea, eastern China, and adjacent regions of eastern Asia, widely grown as a boxwood substitute for formal hedging and topiary. It tolerates heavy shearing well and thrives in acidic soils in a range spanning USDA zones 5b-8b. The honest catch is twofold: the glossy black berries are toxic to humans and pets (a genus-wide trait of Ilex), and the species is listed as invasive in parts of the eastern United States, where bird-dispersed seedlings colonise native woodland edges.
Climate fit: narrow (26/100)
Structure
Border
Container
Focal point
Light
Full sun / Part sun / Part shade
Water
Moderate water
Mature size
36-96" tall · 36" apart
Hardy in zones
5b-8b
very cold to frosty winters
Native in Illinois
No

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The black drupes are toxic to humans, dogs, and cats - ingestion causes vomiting, diarrhoea, and lethargy; large quantities can cause more serious harm.

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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Structure
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Focal point

Educator packet

Plant packet
Japanese Holly educator packet
Japanese holly is a dense, small-leaved evergreen shrub native to Japan, Korea, eastern China, and adjacent regions of eastern Asia, widely grown as a boxwood substitute for formal hedging and topiary. It tolerates heavy shearing well and thrives in acidic soils in a range spanning USDA zones 5b-8b. The honest catch is twofold: the glossy black berries are toxic to humans and pets (a genus-wide trait of Ilex), and the species is listed as invasive in parts of the eastern United States, where bird-dispersed seedlings colonise native woodland edges.
Scientific name
Ilex crenata
Plant type
shrub
Hardiness
5b-8b
Light
full-sun, part-sun, part-shade
Moisture
moderate
Spacing
36 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 Holly (Ilex crenata). Retrieved 2026, June 30, from https://plotwright.com/plants/ilex-crenata
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 3.0
Backs 1 field
Image
GBIF
Botanical research database
Wikipedia (ecoregion articles)
Botanical research database