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Ilex crenata Glory Gem - Japanese Holly

Ilex crenata Glory Gem
Japanese Holly, Box-leaved Holly, Box-leaved Ilex, Dwarf Holly

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This plant carries a 24 months recovery warranty

More information

Glory Gem is a variety of Crinoline Holly with a particularly compact habit and beautiful evergreen dark green foliage. This small shrub is an excellent alternative to boxwood, to which it bears a visual resemblance without being affected by its health problems. Reaching approximately 1 metre (3 feet 4 inches) in all directions, it tolerates pruning well and can be shaped into topiary or used as a low hedge. Hardy, it grows in full sun or partial shade, in most non-calcareous soils and can also be easily grown in a pot.
Flower size
5 mm
Height at maturity
1.20 m
Spread at maturity
1.20 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -20°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time March to April, September to November
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Flowering time May to June
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Description

Ilex crenata 'Glory Gem' is a slow-growing female variety of shrub with a compact habit. As wide as it is tall, its small dark green, glossy, non-prickly leaves give it a Boxwood-like appearance, making it a great alternative in the garden. Its very dense evergreen foliage and excellent ability to be pruned make it ideal for topiary.  This small shrub thrives in sun or partial shade, in slightly moist, well-drained, neutral to slightly acidic soil.

Ilex crenata, the species, is native to temperate regions of Asia (China, Japan, Russia). It was introduced to Europe in the 19th century and to France in 1895.
The shrub has rigid branches, small glossy green leaves with a convex shape, resembling the leaves of Boxwood, measuring 1 to 3 cm (0.4 to 1.2 in) long. In May-June, inconspicuous greenish-white flowers (5 mm (0.2 in)) appear. It is a dioecious plant, meaning each individual is either female or male. In autumn, the female plants produce small black shiny berries that last throughout the winter. In its native habitat, this species can grow over 5 m (16 ft 5 in) tall.
Many selected varieties have a much smaller growth, like Glory Gem, which reaches 1 m (3 ft 4 in) after 10 years of cultivation, or even 1.20 m (3 ft 11 in) when fully grown, with an equivalent width. Its main asset is its very dense branches, with shiny dark green foliage, slightly dentate (crenate) leaves that do not exceed 2 to 3 cm (0.8 to 1.2 in). They are arranged on purple-green branches, naturally forming a bush as wide as it is tall.  This varierty has a tendency to get wider over time. Ilex crenata Glory Gem is a female clone with slow growth, only about 5 to 10 cm (2 to 3.9 in) per year.

This 'Glory Gem' holly can be pruned into a ball shape to enhance a classic garden or into a cube shape in a contemporary garden to create surprise. Its slow growth also makes it easy to maintain as a low hedge, surrounding a vegetable or herb garden. It also finds its place in a Japanese garden (it is a traditional plant in Japan). It can be paired with other plants with miniature foliage, like Azara microphylla, a large shrub for mild climates with small fragrant yellow flowers that stand out against the dark mass of foliage. It can also contrast with the large star-shaped white flowers of the magnificent Magnolia stellata, or with the massive leaves of the Hydrangea quercifolia, with its characteristic cut-out leaf shape that beautifully colours in autumn, while its equally imposing flowers bloom all summer long. Its modest dimensions also allow it to be grown in a beautiful decorative terracotta pot to enhance a terrace, or to fit in the curve of a pathway.

 

Ilex crenata Glory Gem - Japanese Holly in pictures

Ilex crenata Glory Gem - Japanese Holly (Flowering) Flowering
Ilex crenata Glory Gem - Japanese Holly (Foliage) Foliage

Plant habit

Height at maturity 1.20 m
Spread at maturity 1.20 m
Habit Irregular, bushy
Growth rate slow

Flowering

Flower colour insignificant
Flowering time May to June
Flower size 5 mm
Fruit colour black

Foliage

Foliage persistence Evergreen
Foliage colour dark green

Botanical data

Genus

Ilex

Species

crenata

Cultivar

Glory Gem

Family

Aquifoliaceae

Other common names

Japanese Holly, Box-leaved Holly, Box-leaved Ilex, Dwarf Holly

Origin

Cultivar or hybrid

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Planting and care

To plant Ilex crenata 'Glory Gem', add some compost to the soil and incorporate it into the topsoil of your garden (half and half if your soil is a bit low in organic matter). In heavy soil, incorporate some limestone-free coarse gravel at the bottom of the planting hole to create a draining layer, the holly should not have its roots soaked in winter! Plant in autumn or spring, outside of freezing periods, in the final location, as this species does not like to be transplanted.
Soak the holly's root ball in a bucket to thoroughly saturate it before planting, then water after filling the planting hole. Make sure to keep the soil moist during summer by watering when necessary. Starting from the second year, lightly fertilize, preferably with organic fertilizer in spring.
Ilex crenata 'Glory Gem' is sensitive to white scale insects in spring and aphids, inspect the foliage from time to time to be able to take action in time (use black soap treatment to wash the foliage).

For container or pot planting, choose a slightly acidic substrate (pH around 6.5) by adding some limestone-free sand (about 20%) to improve drainage. Regularly water throughout the season. Fertilize with slow-release fertilizers at the beginning of the season, choosing formulas that are not too rich in nitrogen.

Planting period

Best planting time March, October
Recommended planting time March to April, September to November

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Edge of border, Container
Hardiness Hardy down to -20°C (USDA zone 6b) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Acidic, Neutral
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, humus-rich, well-drained

Care

Pruning instructions Prune twice a year, in spring (May or June depending on growth) and in September. This helps maintain the desired shape easily. Use a well-sharpened pair of shears and dispose of the trimmings.
Pruning Pruning recommended twice a year
Pruning time May to June, September
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground

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