Crenate Holly - Ilex crenata Convexa
Crenate Holly - Ilex crenata Convexa
Crenate Holly - Ilex crenata Convexa
Crenate Holly - Ilex crenata Convexa
Ilex crenata Convexa
Japanese Holly, Box-leaved Holly, Box-leaved Ilex, Dwarf Holly
Small but in good shape!
Rose, 03/10/2025
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This plant carries a 24 months recovery warranty
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Description
The Ilex crenata 'Convexa', a variety of crenate holly or Japanese holly, is a small compact bush with evergreen foliage that resembles that of boxwood. Often used in Japanese gardens, it tolerates pruning very well, such as in the Niwaki style. Take your first steps in the art of topiary with this bush.
Ilex crenata is one of the species, native to Japan, introduced to Europe in 1760. 'Convexa' is a horticultural variety. Crenate Holly 'Convexa' forms a small bush that reaches a height of between 1 and 3m (9.8 ft). It has stiff branches and small shiny green leaves with a convex shape resembling the leaves of boxwood measuring 1 to 3cm (0.4 - 1.2in) in length. Insignificant white flowers appear in May-June, and in autumn the bush bears small shiny black berries measuring 2 to 6mm (0.1 - 0.2in), which last throughout the winter.
Slow growing Ilex crenata 'Convexa' dislikes excessive chalk and prefers moist, well-drained, rich and humus-bearing soil. Hardy below -15°C (5°F), it likes partially shaded to shaded areas. Planting is possible under trees and large shrubs. Water it during dry periods and in summer.
It attracts attention when planted as a standalone plant and formed into a topiary. Plant it in an open location for regular growth on all sides.
It can also be used as a low hedge, in mass plantings, and in large pots. Plant it generously in Zen gardens alongside bamboo, Japanese maples, camellias...
Crenate Holly - Ilex crenata Convexa in pictures
Plant habit
Flowering
Foliage
Botanical data
Ilex
crenata
Convexa
Aquifoliaceae
Japanese Holly, Box-leaved Holly, Box-leaved Ilex, Dwarf Holly
Cultivar or hybrid
Planting and care
When planting Ilex crenata 'Convexa', add some compost and incorporate it into the topsoil of your garden. In the early years, do some training pruning by selecting the branches you want to keep. Step back to view your holly as a whole in order to determine the shape and arrangement of the short stems. Ilex crenata 'Convexa' is susceptible to white scale insects in spring and mites and aphids in summer. Apply a preventive treatment at the beginning of the season.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
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In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.