Species

Ilex crenataJapanese Holly

18 other cultivars

shrub

Japanese Holly 'Glory Gem'

Ilex crenata 'Glory Gem'

The Story

Plant Bio

Ilex crenata, the Japanese holly, is an evergreen shrub native to eastern Asia, characterized by small, glossy leaves with finely scalloped margins. Unlike many other hollies, this species lacks spiny foliage and produces inconspicuous white flowers followed by small black drupes on female plants.

'Glory Gem' is a dense, rounded cultivar that reaches up to eighty inches in height and width, featuring a tight, fine-textured crown of diagonally extending branches. The small, dark green leaves emerge as a bright, lighter green in spring, making it a highly effective substitute for boxwood.

Uses & Benefits:

Provides a dense, fine-textured, evergreen structure ideal for formal hedging, topiary, and boxwood-style knot gardens.

Serves as an excellent, disease-resistant alternative to boxwood, completely immune to box blight and box tree moth.

Inconspicuous flowers attract small native bees, while female plants produce black drupes that serve as a food source for local birds.

SpeciesIlex crenataJapanese Holly

Essentials

At a Glance

Plant Type

Shrub

Height

80"

Width

80"

Light

Full Sun, Partial Sun

Zones

6, 7, 8

Water

Medium

Humidity

High

Lifespan

Long-lived

Native To

Eastern Asia

Toxicity

Toxic to humans and pets

Bloom period

Late spring – Early summer

In flower about 2 months of the year

Planting

How to Grow

Select a planting site with moist, well-drained, acidic to neutral soil in full sun or partial shade.
Dig a hole twice as wide as the root ball and of equal depth, ensuring the crown sits level with the surrounding soil.
Backfill with native soil amended with organic matter, tamping gently to remove air pockets.
Water thoroughly and apply a two-inch layer of organic mulch to retain moisture, keeping it clear of the main stem.

Pro Tip

Never shear past the green foliage envelope into the brown, leafless interior wood; Ilex crenata lacks latent buds on old wood and cannot regenerate from bare branches.

Keep It Thriving

Care Guide

Do

Maintain consistent soil moisture, especially during hot, dry summer spells.
Apply an acidic, slow-release fertilizer in early spring to prevent iron chlorosis.
Prune in late summer to maintain a tight, formal shape or hedge.

Don't

Do not plant in heavy, poorly drained clay soils where water stagnates.
Do not cut back into old, bare wood, as the plant lacks latent buds to regenerate.
Do not allow the soil to dry out completely, which causes rapid foliage decline.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Mulch
Pest Check
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Formal hedgesFoundation plantingsTopiary and cloud pruningKnot gardens

Companion Plants

Rhododendron Pieris japonica Astilbe

Multiply

Propagation Methods

Good to Know

Common Questions

Japanese Holly 'Glory Gem' questions

What zones can Japanese Holly 'Glory Gem' grow in?

Japanese Holly 'Glory Gem' is hardy in USDA Zones 6–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Japanese Holly 'Glory Gem' deer resistant?

Yes — Japanese Holly 'Glory Gem' is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Japanese Holly 'Glory Gem' bloom?

Japanese Holly 'Glory Gem' typically blooms in late spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Japanese Holly 'Glory Gem' need full sun?

Japanese Holly 'Glory Gem' does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.