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1.Ilex Crenata — Overview
Ilex crenata, commonly known as Japanese holly or box-leaf holly, is a sophisticated evergreen shrub or small tree belonging to the Aquifoliaceae family. Native to the temperate and subtropical regions of East Asia, including China, Japan, Korea, and Taiwan, this species thrives in diverse environments. Its growth habit is typically dense and compact, reaching a mature height of 1 to 4 meters (3 to 13 feet) with a similar spread, though some cultivars can grow taller. The foliage is a key ornamental feature, characterized by small, alternate leaves that are typically ovate to obovate, measuring 1 to 3 cm in length. These leaves possess finely crenated or scalloped margins, which gives rise to its specific epithet 'crenata'.
The upper surface is a lustrous dark green, while the underside is paler. In late spring to early summer, Ilex crenata produces inconspicuous, small white flowers. These flowers are dioecious, meaning male and female flowers are borne on separate plants. Successful pollination on female plants leads to the development of small, spherical, black drupes (berries) in autumn, which persist through winter, offering a subtle contrast against the dark green leaves. While visually appealing, these fruits are not typically consumed.
Japanese holly demonstrates remarkable adaptability, flourishing in a range of soil types, preferably moist, well-drained, and acidic, and tolerating both full sun and partial shade. Its resilience to urban pollution and ability to withstand heavy pruning make it an exceptional choice for formal hedges, topiary, and intricate landscape designs, cementing its role as a versatile and enduring garden staple. Various cultivars further expand its utility, offering different sizes, leaf forms, and growth rates, such as 'Convexa' with its distinctive convex leaves and 'Helleri' known for its dwarf, compact habit.
Trusted Scientific References
1. Authoritative external sources for Ilex crenata
1.1 Wikipedia — Ilex crenata
1.2 Kew POWO (Plants of the World Online)
1.3 PubMed — peer-reviewed research
1.4 NCBI Taxonomy Browser
1.5 GBIF — Global Biodiversity
1.1.Ilex Crenata — Key Features
- ✓ <strong>Evergreen Foliage</strong> — Dense, glossy, dark green leaves provide year-round visual appeal.
- ✓ <strong>Ornamental Value</strong> — Highly prized for hedges, topiary, and formal garden designs.
- ✓ <strong>Adaptability</strong> — Tolerates a wide range of soil conditions and light exposures.
- ✓ <strong>Pruning Tolerance</strong> — Responds exceptionally well to heavy pruning and shaping.
- ✓ <strong>Dioecious Flowers</strong> — Separate male and female plants; female plants produce small black berries.
- ✓ <strong>Native to East Asia</strong> — Indigenous to China, Japan, Korea, and Taiwan.
- ✓ <strong>Traditional Medicinal Use</strong> — Historically used in folk medicine for various ailments in its native regions.
- ✓ <strong>Resilient Species</strong> — Known for its hardiness and tolerance to urban pollution.
- ✓ <strong>Compact Growth Habit</strong> — Typically forms a dense, rounded to pyramidal shape.
- ✓ <strong>Diverse Cultivars</strong> — Numerous varieties available offering different sizes and leaf forms.
1.2.Ilex Crenata — Quick Summary
- ✓ Japanese Holly: Evergreen shrub, ornamental, native to East Asia.
- ✓ Traditional Uses: Anti-inflammatory, antioxidant, diuretic, fever reduction.
- ✓ Key Compounds: Flavonoids, triterpenoids, phenolic acids.
- ✓ Cultivation: Prefers moist, acidic soil, tolerates sun to partial shade, excellent for pruning.
- ✓ Safety: Mildly toxic berries, potential GI upset with high doses, consult healthcare professional.
- ✓ SEO: "Ilex crenata benefits," "Japanese holly uses," "box-leaf holly care."
2.Ilex Crenata — Scientific Identity
3.Ilex Crenata — Quick Facts
4.Ilex Crenata — Appearance & Identification
5.Ilex Crenata — Native Habitat
6.Ilex Crenata — Water Requirements
- ✓ Site Selection — Choose a location with full sun to partial shade; Japanese holly tolerates a range but prefers some sun for denser growth.
- ✓ Soil Requirements — Plant in moist, well-drained, acidic soil (pH 5.0-6.5). Amend heavy clay or sandy soils with organic matter.
- ✓ Watering — Keep the soil consistently moist, especially during establishment and dry periods. Avoid waterlogging.
- ✓ Fertilization — Apply a balanced, slow-release fertilizer formulated for acid-loving evergreens in early spring as new growth emerges.
- ✓ Pruning — Prune in late winter or early spring to shape, remove dead/damaged branches, or maintain desired size and form. It tolerates heavy pruning well.
- ✓ Mulching — Apply a 2-3 inch layer of organic mulch around the base to conserve moisture, regulate soil temperature, and suppress weeds.
- ✓ Pest and Disease Management — Monitor for common issues like spider mites, scale, or leaf spot. Ensure good air circulation to prevent fungal problems.
- ✓ Winter Protection — In colder zones, protect young plants from harsh winter winds and extreme cold with mulch or burlap.
Reviewed by the Flora Medical Global Botanical Review Panel
Multi-disciplinary editorial group · Botany · Ethnobotany · Herbal-medicine literature
Who reviewed this: This page was checked by the Flora Medical Global Botanical Review Panel — an in-house editorial group of botany graduates, ethnobotany researchers, and horticulture practitioners who collectively maintain our 7,000+ plant encyclopedia. Meet the team.
Our 4-step verification process
1. Taxonomic verification
Scientific names and synonyms cross-checked against Kew POWO, World Flora Online, and The Plant List.
2. Phytochemical & medicinal cross-reference
Active compounds, traditional uses, and reported activities are cross-referenced with PubMed, USDA Dr. Duke's database, and peer-reviewed ethnobotanical literature.
3. Conservation & distribution check
Distribution, ecology, and conservation status confirmed against GBIF occurrence records and the IUCN Red List.
4. Editorial & safety review
Every entry passes an editorial pass for clarity, originality, and safety notices (toxicity, contraindications, dosage caveats) before publication.
Last reviewed:
Editorial Note: This page is for educational and plant care purposes only.
Written by: Flora Medical Global Editorial Team
Reviewed by: Flora Medical Global Botanical Review Panel
Last Updated: June 15, 2026
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