Highclere holly
Ilex altaclerensis · Aquifoliaceae
⚠️ Chiens, chats et enfants : baies et feuilles toxiques par ingestion, causant troubles digestifs graves.
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around highclere holly and prepare for winter.
ID card
- Foliage
- Evergreen, dark green, spiny
- Flowering
- May to June, discreet white flowers
- Mature size
- Approximately 4 m tall
- Growth
- Moderate
- Hardiness
- Very hardy (down to -15 °C)
- Origin
- Horticultural hybrid, created in England
- Soil type
- Well-drained, slightly acidic to neutral
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Holly tolerates much but prefers rich soil and good drainage. Slow growth (10-20 cm/year).
The common mistake
Planting a single specimen (no male) or expecting abundant berries without a flowering male nearby: little to no fruit even on a healthy plant.
The pro's trick
Check with your nursery: plant one male (discreet flower, no berries) for every 2 females.
Care
Exposure
Highclere holly thrives in full sun, ideally with a minimum of 6 hours per day. It tolerates partial shade, but bright exposure guarantees denser and more colorful foliage. Avoid overly windy locations that can dry out the evergreen foliage.
Watering
Water regularly during the first year after planting to promote root establishment. Once established, holly tolerates moderate dry periods. During very hot summers or prolonged drought, maintain consistent soil moisture without waterlogging.
Soil and Planting
Plant in well-drained soil rich in organic matter and slightly acidic to neutral. Adding compost or potting soil at planting facilitates establishment. Mulch the base to retain moisture and moderate temperature fluctuations.
Fertilizing
An annual application of balanced fertilizer in spring is generally sufficient. For particularly vigorous foliage, supplement with a fertilizer rich in potassium and magnesium. Avoid excess nitrogen which would promote soft growth.
Pruning and Cutting
Prune lightly after flowering to maintain a harmonious shape. Highclere holly responds well to topiary or hedge pruning. Remove dead or diseased branches in winter. Pruning is not strictly necessary if you let the plant develop freely.
Pests and Diseases
This is a generally robust shrub with low disease susceptibility. Watch for scale insects and aphids early in the season, especially in warm conditions. Good drainage and adequate air circulation prevent most fungal problems.
Did you know?
Highclere holly is a hybrid created at Highclere Castle in England in the 19th century, resulting from a cross between Ilex aquifolium and Ilex perado. This ornamental shrub combines the remarkable hardiness of common holly with more vigorous growth and an elegant form, making it a highly prized species for British landscape designers and European gardens.
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
- Japanese hollyIlex crenata
- Yerba mateIlex paraguariensis
- Ilex meserveaeIlex meserveae
- WinterberryIlex verticillata
Tips generated and checked by Viridia — adapt them to your local climate.