Ilex crenata Convexed Gold - Japanese Holly
Ilex crenata Convexed Gold - Japanese Holly
Ilex crenata Convexed Gold - Japanese Holly
Ilex crenata Convexed Gold
Japanese Holly, Box-leaved Holly, Box-leaved Ilex, Dwarf Holly
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Description
Ilex crenata Convexed Gold is a variety of crenate holly that is interesting for its compact habit, very dense foliage, and its small, unique, golden and shiny leaves that have a beautiful convex appearance. This relation of the common holly is a small evergreen bush that tolerates pruning very well and remains decorative throughout the year, even in winter. It can be used as a replacement for boxwood in landscaping. Its small size and natural elegance are particularly suitable for small gardens, low hedges, and container gardening. Crenate holly is easy to grow in loose, not too calcareous and slightly acidic soil, in full sun or partial shade.
Crenate holly, in Latin Ilex crenata, is a shrub native to Japan, belonging to the Aquifoliaceae family. The 'Convexed Gold' variety, as its name suggests, has been selected for its convex leaves that slightly fold outward and for their yellow colour. It is a slow-growing shrub, especially during the establishment phase that lasts from 2 to 3 years. This selection has a bushy, highly branched, low and dense habit. The branches sometimes tend to grow horizontally, giving the unpruned shrub a low and wide silhouette. At maturity, it will reach an average height of 80 cm (31.5 in) with a spread of 50-60 cm. Its tiny, round and leathery leaves are golden when they first emerge and turn slightly green in summer. They have a slight gloss and are not prickly. All hollies are dioecious plants, meaning they are plants with male flowers and plants with female flowers. Only the female holly produces berries. In spring, the female Japanese holly produces small, insignificant but nectar-rich flowers in a matte white colour. After being pollinated by a male holly planted nearby, these will form fleshy, round shiny black berries. Distinguishing the sex of the flowers requires a trained eye; they all have four white petals and a waxy surface, but the male flowers can be recognized by their four prominent yellow stamens, while the female flowers have a short, green, ovate pistil. The same shrub can produce both male and ineffective female flowers that cannot be pollinated. The seeds are dispersed by birds that love the fruits.
A versatile plant, growing faster than boxwood, Ilex crenata Convexed Gold will please gardeners who love French-style gardens, well-kept hedges, and topiary. It is perfect in a large pot on the terrace or balcony. Not very demanding, it mainly dislikes excess sunlight and lime and prefers well-draining, loose, deep, and fairly fertile soils. Hardy well beyond -15°C, it likes semi-shaded to shaded areas, for example under trees or an east facing situation. Plant in Zen gardens in the company of dwarf bamboo, Japanese maples, camellias... Its association with Mexican orange trees and bushy honeysuckles (Lonicera Nitida, Lonicera pileata) also works well to create structure in a mixed border.
Ilex crenata Convexed Gold - Japanese Holly in pictures
Plant habit
Flowering
Foliage
Planting and care
To plant the Convexed Gold holly, add a generous amount of compost and incorporate it into your garden soil, in order to slightly acidify the soil while enriching it. If your soil is rich in limestone, the holly will tend to suffer from chlorosis (the foliage gradually yellows around the leaf veins) and struggle to thrive. Choose a sunny location that is not too hot, partially shaded (or shaded in hot climates). Follow the watering (with non-calciferous water) for the first 3 years, especially during summer when there is prolonged drought, to help the shrub to establish itself. It will then manage on its own in partial shade and in deep soil, as it tolerates drought quite well. When you want to give a specific shape to this crenate holly, prune it once or twice a year: first in early summer, then possibly in September-October. The Ilex can be attacked by holly leaf miners, white scales in spring, and mites and aphids in summer. Consider applying a preventive treatment at the beginning of the season. Ilex crenata prefers climates with cold winters and mild summers.
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).
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.
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