Japanese holly
Ilex crenata · Aquifoliaceae
📷 KENPEI · CC BY-SA 3.0
⚠️ Fruits toxiques pour chats et chiens; ingestion provoque troubles digestifs, apathie et hypothermie.
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around japanese holly and prepare for winter.
ID card
- Scientific name
- Ilex crenata
- Family
- Aquifoliaceae
- Foliage
- Evergreen
- Flowering
- April to May, small discreet white flowers
- Adult size
- 1.5 m height
- Growth
- Slow to moderate
- Hardiness
- Hardy down to -15°C
- Origin
- Japan and Far East
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Crested holly thrives in well-draining, slightly acidic soil. Winter pruning (January-February) is no problem; this plant hates excess nitrogen which weakens it.
The common mistake
Over-amending or fertilizing every spring: it becomes pale green, soft, and disease-prone; it prefers lean conditions.
The pro's trick
Plant a male specimen near females if you want decorative berries.
Care
Light exposure
The box-leaved holly prefers a semi-shaded location, though it also tolerates full sun. Avoid overly hot and drying exposures in Mediterranean climates, where light shade improves growth. Protection from strong winds is beneficial.
Watering
Keep the soil regularly moist without waterlogging, especially during establishment and in summer. In winter, reduce watering, but don't let the substrate dry out completely. Mulching helps retain moisture.
Soil
The box-leaved holly appreciates well-draining soil, rich in organic matter and slightly acidic. Chalky soils are tolerated but may reduce vigor. Enrich the substrate with well-decomposed compost at planting time.
Pruning and maintenance
Prune lightly after flowering to maintain a compact and dense shape. This plant responds very well to pruning and can be shaped into topiary. Remove dead or diseased branches as soon as you spot them.
Fertilizing
Apply a balanced fertilizer in spring when growth resumes. An annual application is usually sufficient to maintain good vigor. Avoid excess nitrogen which would promote foliage at the expense of structure.
Diseases and pests
The box-leaved holly is generally robust, but can be affected by spider mites in overly dry conditions. Watch for scale insects indoors or in greenhouses. Good air circulation and humidity levels limit these problems.
Did you know?
The box-leaved holly is renowned for its ability to be pruned into geometric shapes, particularly in topiary art. In Japan, it has long been used in traditional gardens to create low hedges and refined landscape compositions. Its small glossy leaves and tiny red berries (on female plants) make it an ideal candidate for miniature arrangements.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
Add this plant to my garden →Plants from the same family
- HollyIlex aquifolium
- Yaupon hollyIlex vomitoria
- Yerba mateIlex paraguariensis
- Highclere hollyIlex altaclerensis
- Ilex meserveaeIlex meserveae
- WinterberryIlex verticillata
Tips generated and checked by Viridia — adapt them to your local climate.