Does it need full sun?

It prefers full sun to partial shade.

How often should I prune it?

Prune once or twice a year to maintain its shape.

Plant guide

Japanese holly.

Ilex crenata

Pronounced EYE-leks kre-NAY-tuh

Also known as Box-leaf Holly, Japanese Holly, box-leaved holly

Japanese holly — Photo by Sandy Wolkenberg (CC BY) via iNaturalist

This evergreen shrub is a fantastic choice for hedges or topiary because of its dense, boxwood like appearance. It thrives in temperate climates and brings a lovely, formal structure to your garden. You will love how its small, dark leaves stay green all year long.

Another photo of Japanese holly — Photo by Tom Pollard (CC BY) via iNaturalist

At a glance

Care level: Easy
Plant type: Evergreen shrub
Light: Full sun to partial shade
Indoor light: Bright indirect
Water: Every 5 to 10 days
Mature size: 3 to 10 feet
Growth rate: Medium
Hardiness: USDA 5 to 8
Bloom time: Late spring to early summer

Care

Keep the soil consistently moist but never soggy to prevent root issues. Watch for yellowing leaves, which often signal that your soil pH is too high. Regular trimming helps maintain its shape and encourages thicker growth.

Watering: Water deeply whenever the top inch of soil feels dry to the touch.
Feeding: Apply an acid loving fertilizer once in early spring and again in early summer.
Pruning: Trim lightly in late spring or early summer to maintain your desired shape.
Repotting: Repot only when the roots have completely filled the container.
Soil: Well draining, acidic soil
Soil pH: 5.0 to 6.5
Temperature: -23 to 35°C
Humidity: 40 to 70%
Drought tolerance: Moderate
Lifespan: Perennial, typically 30 to 50 years.
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the drainage holes
Water running straight through the pot without soaking in

Safety

People: All parts of the plant are considered toxic if ingested, causing nausea and vomiting.
Pets: The berries can be mildly toxic to cats and dogs if ingested.
Children: Keep the small black berries away from young children as they are a choking hazard and toxic.
Contact allergens: The leaves can cause mild skin irritation in sensitive individuals.
Airborne allergens: The pollen is generally not considered a significant allergen.
Edibility: The berries are toxic to humans and should never be consumed.

How to identify it

Small, glossy, dark green leaves
Tiny, inconspicuous white flowers
Small black berry like fruits
Dense, twiggy, upright growth habit

Height: 1.5 to 3m
Spread: 1 to 2m
Leaves: dark green, evergreen
Flowers: white, greenish, 0.5 to 0.8cm
Fruit: black, Autumn

Problems to watch for

Black root rot · A fungal issue that causes wilting and death, often in poorly drained soil.
Holly leaf miner · Small larvae create unsightly tunnels inside the leaves.

By symptom

Plant problems by symptom

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Growing it

Propagation: cuttings, seed
When to plant: spring, autumn
Overwintering: Apply a layer of mulch around the base to protect roots from temperature swings. Ensure the soil does not dry out completely during winter thaws.
In containers: It grows well in containers, provided the pot has excellent drainage and is at least 40 cm wide.

Semi-hardwood cuttings

Take 10 cm cuttings in late summer.
Remove lower leaves and dip the end in rooting hormone.
Place in a moist, well draining potting mix.
Cover with a plastic bag to maintain humidity until rooted.

Group with other acid loving plants to simplify soil management.

Grows well with

Azalea · They share similar acidic soil requirements.
Japanese Maple · The fine texture of the holly contrasts beautifully with maple foliage.

Similar species

Boxwood · Often used for similar hedging purposes but has different leaf shapes.

Science

Family: Aquifoliaceae
Genus: Ilex
Order: Aquifoliales
Class: Magnoliopsida
Native range: East Asia, including Japan, Korea, and China.
Conservation: Not currently of conservation concern.

It grows in moist, well drained forests and thickets where it provides shelter for small birds.

Value to wildlife: nectar source, winter cover for birds
Pollinators: bees
Uses: hedging, topiary, foundation planting, container gardening

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 4/9
Light: 6/9
Temperature: 5/9
Moisture: 6/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need full sun?: It prefers full sun to partial shade.
How often should I prune it?: Prune once or twice a year to maintain its shape.

Where the name comes from

Ilex is the ancient Latin name for holly, while crenata describes the scalloped leaf margins.

Good to know

It is often used as a substitute for boxwood in landscapes.
The species name crenata refers to the small, rounded teeth along the leaf edges.
It is native to East Asia, including Japan and Korea.

Also in

Plants toxic to cats and dogs

Keep your japanese holly growing

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This guide was generated with AI on October 19, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.