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Sweet box

Sweet box

Sarcococca confusa
Sweet box is a slow-growing, evergreen shrub probably native to western China (its true wild origin is uncertain — it is known mainly in cultivation) that earns its winter garden value through intensely honey-scented white flowers produced in mid-winter, followed by glossy black berries. It holds an RHS Award of Garden Merit and excels as a tough, structural underplanting in dry shade where little else will grow. The honest catch: the berries are toxic if ingested (a real caution for households with children or pets), and the plant suckers to form an ever-widening colony that can be difficult to contain once established.
Climate fit: narrow (30/100)
Border
Structure
Container
Light
Part sun / Part shade
Water
Moderate water
Mature size
24-79" tall · 36" apart
Hardy in zones
6a-9b
cold to frosty winters
Native in Illinois
No

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The glossy black berries are ornamental and not for consumption; they are toxic if ingested and pose a risk to children, dogs, and cats, with ingestion liable to cause nausea, vomiting, and gastrointestinal irritation.

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

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A woody, deciduous flowering shrub in the Hydrangeaceae, native to Japan, China, Korea, and Southeast Asia and long grown as the classic "hortensia" or French hydrangea. NC State Extension describes a rounded shrub 3 to 6 feet tall and wide with large opposite, simple, toothed leaves (4-8 inches long) and big rounded mop-head or flat lacecap flower clusters in late spring and summer in white, pink, blue, or purple. Famously, flower color tracks soil chemistry — acidic soils push the blooms blue and alkaline soils turn them pink. It wants protection from hot afternoon sun and steady moisture, making it a mainstay of shaded foundation plantings and woodland borders.
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Ilex crenata
Japanese Holly
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.
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Pittosporum tobira
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Educator packet

Plant packet
Sweet box educator packet
Sweet box is a slow-growing, evergreen shrub probably native to western China (its true wild origin is uncertain — it is known mainly in cultivation) that earns its winter garden value through intensely honey-scented white flowers produced in mid-winter, followed by glossy black berries. It holds an RHS Award of Garden Merit and excels as a tough, structural underplanting in dry shade where little else will grow. The honest catch: the berries are toxic if ingested (a real caution for households with children or pets), and the plant suckers to form an ever-widening colony that can be difficult to contain once established.
Scientific name
Sarcococca confusa
Plant type
shrub
Hardiness
6a-9b
Light
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). Sweet box (Sarcococca confusa). Retrieved 2026, June 30, from https://plotwright.com/plants/sarcococca-confusa
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