Ilex crenata ‘Helleri’ -- Heller Japanese Holly

Common Name

Heller Japanese Holly

Origin

Nursery

Family

Aquifoliaceae

Type

Broadleaf evergreen shrub

ID Features

Low, broad oval shape with very stiff branches; very dense Simple, alternate leaves with serrated, pointed leaf tip; leaves lay flat No flowers/fruit

Size

Mature: 1½ - 2½” H, 3 – 4’ S

Landscape: 10 – 16” (18”) H, 20 – 24”

Growth rate: Slow (~ 2½” per year in good years)

Form

Low, broad oval shape with very stiff branches; very dense

habit photo
Ilex crenata ‘Helleri’ habit

Bark & Branches

New stems & leaves are bright yellow-green Older bark is dark olive green to gray (old bark at base of plant)

bark photo
Ilex crenata ‘Helleri’ bark

Foliage

Simple, alternate leaves (5/8 – ¾” long, ¼ - 3/8” wide) Leaf tip is pointed (vs. ‘Convexa’) & serrated; leaves lay flat Color: bright yellow-green (new growth) to glossy dark green (mature growth)

foliage photo
Ilex crenata ‘Helleri’ foliage

Flowers

--

Cultural considerations

Hardiness

Sunset: 3 – 9, 14 – 24

USDA: 5 – 8

Exposure

Part sun (afternoon shade) to shade

Soil

Prefers ~ acidic soil with lots of organic matter; tolerates heavy clay

Water

Regular irrigation

Pests

Spidermites—provide good air where circulation

Problems

Mechanical damage: people walk by/over & destroy the very stiff, easily-broken branches

Pruning

Remove dead/damaged branches Ok to shear as hedge

Propagation

Cuttings—starting with 2-inch cutting will yield saleable plant in 6 –7 years

Use

Specimen shrub; hedge; container

Links

OSU -- Wikipedia

Credits

Photos taken by Jeff Kidder on the PCC Rock Creek campus, unless noted to the contrary.

Much of the text in the plant info was taken from handouts in the Evergreen Plant ID course.