• Photo of Ilex crenata 'Convexa' (Ilex crenata 'Convexa's)

Plant Profile: Ilex crenata 'Convexa'

Names

Convexa Japanese Holly, Convex-Leaved Japanese Holly

  • Photo of Ilex crenata 'Convexa' (Ilex crenata 'Convexa's)

Phonetic Spelling:EYE-leks kre-NAY-tuh

Genus:Ilex

Species:crenata

Family:Aquifoliaceae

The Convexa Japanese Holly is an attractive evergreen shrub belonging to the Aquifoliaceae family. This shrub is notably dense and responds well to significant pruning and topiary, making it suitable for hedging, reaching heights of up to 8 1/5 inches. It produces flowers in late spring, with its fruits maturing in the fall. The fruits, which are black and not particularly striking, are accompanied by leaves that are generally smaller than those of the 'Hetzii' or 'Latifolia' varieties. This plant is resilient, capable of withstanding drought, air pollution, and various soil types, including poor, sandy, and clay soils. It has a slow growth rate, prefers shaded areas, is easy to transplant, and does not thrive in alkaline soils. However, it is vulnerable to spider mites and may experience deficiencies in iron and nitrogen.

**Quick Identification Tips:**

For further details, refer to information on Ilex crenata.

Ilex crenata 'Convexa' Feature Summary

Ilex crenata 'Convexa' Image Gallery

Tags

#white
#evergreen
#white flowers
#green
#shrub
#wildlife plant
#green flowers
#nectar plant
#spring flowers
#air pollution tolerant
#specialized bees
#pollinator plant
#black fruits
#japanese
#poor soils tolerant
#sandy soils tolerant
#clay soils tolerant
#bee friendly

Similar Plants

Ilex crenata 'Convexa' is often confused with:

Ilex crenata 'Convexa' Feature Summary

Attributes
The small fragrant flowers attract bees. Members of the genus Ilex support the following specialized bee: Colletes banksi.
Fruit
Inconspicuous globose, berry-like black drupe that is slightly greater than 1/5" in length. Only female plants have fruits. Fruits ripen in fall and are not showy.
Berry
Drupe
< 1 inch
Flowers
Non-showy greenish white flowers in spring that form in clusters of 2 to 3 and are 2/10' in length. Flowers bloom in late spring.
White
Green
4-5 petals/rays
< 1 inch
Leaves
Leaves are glossy black-green in color and the underside of the leaves are dotted with blackish pellucid glands. The leaf is too small to fit on a fingertip (around 2/5"-1/2" in length), and are crenate and convex.
Green
Black
Purple/Lavender
Elliptical
Oblong
Lanceolate
Obovate
Serrate
Crenate
< 1 inch
Glossy
Smooth
Leathery
Waxy
< 1 inch
Stem
Stems are green on current season of growth and turn gray-green to gray-brown by year 2 or 3. Young stems are often densely pubescent.
Brown/Copper
Green
Hairy (pubescent)
Whole Plant Traits
Erect
Dense
Spreading
Medium
Cultural Conditions
Full sun (6 or more hours of direct sunlight a day)
Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Acid (<6.0)
Good Drainage
Coastal
Mountains
Piedmont
High Organic Matter
Loam (Silt)
Sand
Landscape
Pollinator Garden
English Garden
Border
Foundation Planting
Hedge
Mass Planting
Small groups
Container
Patio
Walkways
Recreational Play Area
Lawn
Slope/Bank
Coastal
Pollinators
Bees
Specialized Bees

Ilex crenata 'Convexa' Attributes

Ilex crenata 'Convexa': Wildlife Value

The small fragrant flowers attract bees. Members of the genus Ilex support the following specialized bee: Colletes banksi.

Ilex crenata 'Convexa': Particularly Resistant To (Insects/Diseases/Other Problems)

Moderately resistant to damage by deer

Ilex crenata 'Convexa': Life Cycle

Annual
Biennial
Bulb
Perennial
Woody

Ilex crenata 'Convexa': Recommended Propagation Strategy

Division
Grafting
Layering
Leaf Cutting
Root Cutting
Seed
Stem Cutting

Ilex crenata 'Convexa' Fruit

Ilex crenata 'Convexa': Fruit Description

Inconspicuous globose, berry-like black drupe that is slightly greater than 1/5" in length. Only female plants have fruits. Fruits ripen in fall and are not showy.

Ilex crenata 'Convexa': Fruit Type

Achene
Aggregate
Berry
Capsule
Caryopsis
Drupe
Follicle
Legume
Nut
Pome
Samara
Schizocarp
Siliqua

Ilex crenata 'Convexa': Fruit Color

grass
Black

Ilex crenata 'Convexa': Display/Harvest Time

Fall
Spring
Summer
Winter

Ilex crenata 'Convexa': Fruit Length

< 1 inch
1-3 inches
> 3 inches

Ilex crenata 'Convexa': Fruit Width

< 1 inch
1-3 inches
> 3 inches

Ilex crenata 'Convexa' Flowers

Ilex crenata 'Convexa': Flower Description

Non-showy greenish white flowers in spring that form in clusters of 2 to 3 and are 2/10' in length. Flowers bloom in late spring.

Ilex crenata 'Convexa': Flower Color

filter_vintage
Green
filter_vintage
White

Ilex crenata 'Convexa': Flower Inflorescence

Catkin
Corymb
Cyme
Head
Insignificant
Panicle
Raceme
Solitary
Spadix
Spike
Umbel

Ilex crenata 'Convexa': Flower Bloom Time

Winter
Spring
Summer
Fall

Ilex crenata 'Convexa': Flower Petals

2-3 rays/petals
4-5 petals/rays
6 petals/rays
7 - 20 petals/rays
asymmetrical petals
Bracts
Colored Sepals
fused petals
more than 20 petals/rays
Tepals

Ilex crenata 'Convexa': Flower Size

1-3 inches
3-6 inches
< 1 inch
> 6 inches

Ilex crenata 'Convexa' Leaves

Ilex crenata 'Convexa': Leaf Description

Leaves are glossy black-green in color and the underside of the leaves are dotted with blackish pellucid glands. The leaf is too small to fit on a fingertip (around 2/5"-1/2" in length), and are crenate and convex.

Ilex crenata 'Convexa': Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Ilex crenata 'Convexa': Leaf Color

spa
Black
spa
Green
spa
Purple/Lavender

Ilex crenata 'Convexa': Leaf Type

Compound (Pinnately , Bipinnately, Palmately)
Fronds
Needles
Sheath
Simple

Ilex crenata 'Convexa': Leaf Arrangement

Alternate
Opposite
Other/more complex
Rosulate
Whorled

Ilex crenata 'Convexa': Leaf Shape

Acicular
Auriculate
Cordate
Cuneate
Deltoid
Elliptical
Filiform
Lanceolate
Linear
Oblanceolate
Oblong
Obovate
Obtuse
Orbicular
Ovate
Palmasect
Palmatifid
Peltate
Pinnatifid
Pinnatisect
Reniform
Rhomboidal
Spatulate
Subcordate
Subulate

Ilex crenata 'Convexa': Leaf Margin

Crenate
Crenulate
Dentate
Denticulate
Doubly Crenate
Doubly Dentate
Doubly Serrate
Entire
Lobed
Serrate
Sinuate
Undulate

Ilex crenata 'Convexa': Hairs Present

No
Yes

Ilex crenata 'Convexa': Leaf Length

< 1 inch
1-3 inches
3-6 inches
> 6 inches

Ilex crenata 'Convexa': Leaf Feel

Fleshy
Glossy
Leathery
Papery
Prickly
Rough
Rubbery
Slippery
Smooth
Soft
Velvety
Waxy

Ilex crenata 'Convexa': Leaf Width

< 1 inch
1-3 inches
3-6 inches
> 6 inches

Ilex crenata 'Convexa' Stem

Ilex crenata 'Convexa': Stem Description

Stems are green on current season of growth and turn gray-green to gray-brown by year 2 or 3. Young stems are often densely pubescent.

Ilex crenata 'Convexa': Stem Color

grass
Brown/Copper
grass
Green

Ilex crenata 'Convexa': Stem Is Aromatic

No
Yes

Ilex crenata 'Convexa': Stem Surface

Corky Ridges
Covered with a powdery bloom (glaucous)
Dull
Hairy (pubescent)
Polished
Smooth (glabrous)

Ilex crenata 'Convexa' Whole Plant Traits

Ilex crenata 'Convexa': Plant Type

Annual
Bulb
Carnivorous
Edible
Epiphyte
Fern
Ground Cover
Herb
Herbaceous Perennial
Houseplant
Mushroom
Native Plant
Ornamental Grasses and Sedges
Perennial
Poisonous
Rose
Shrub
Succulent
Tree
Turfgrass
Vegetable
Vine
Water Plant
Weed
Wildflower

Ilex crenata 'Convexa': Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Ilex crenata 'Convexa': Habit/Form

Arching
Ascending
Broad
Cascading
Climbing
Clumping
Columnar
Conical
Creeping
Dense
Erect
Horizontal
Irregular
Mounding
Multi-stemmed
Multi-trunked
Open
Oval
Prostrate
Pyramidal
Rounded
Spreading
Vase
Weeping

Ilex crenata 'Convexa': Growth Rate

Slow
Medium
Rapid

Ilex crenata 'Convexa': Maintenance

Low
Medium
High

Ilex crenata 'Convexa': Texture

Fine
Medium
Coarse

Ilex crenata 'Convexa' Cultural Conditions

Ilex crenata 'Convexa': Light

Dappled Sunlight (Shade through upper canopy all day)
Deep shade (Less than 2 hours to no direct sunlight)
Full sun (6 or more hours of direct sunlight a day)
Partial Shade (Direct sunlight only part of the day, 2-6 hours)

Ilex crenata 'Convexa': Soil pH

Acid (<6.0)
Alkaline (>8.0)
Neutral (6.0-8.0)

Ilex crenata 'Convexa': Soil Drainage

Frequent Standing Water
Good Drainage
Moist
Occasional Flooding
Occasionally Dry
Occasionally Wet
Very Dry

Ilex crenata 'Convexa': Available Space To Plant

12 inches-3 feet
12-24 feet
24-60 feet
3 feet-6 feet
6-feet-12 feet
Less than 12 inches
more than 60 feet

Ilex crenata 'Convexa': NC Region

Coastal
Mountains
Piedmont

Ilex crenata 'Convexa': USDA Plant Hardiness Zone

thermostat
5a
thermostat
5b
thermostat
6a
thermostat
6b
thermostat
7a
thermostat
7b

Ilex crenata 'Convexa': Soil Texture

Clay
High Organic Matter
Loam (Silt)
Sand
Shallow Rocky

Ilex crenata 'Convexa' Landscape

Ilex crenata 'Convexa': Landscape Theme

Asian Garden
Butterfly Garden
Children's Garden
Cottage Garden
Cutting Garden
Drought Tolerant Garden
Edible Garden
English Garden
Fairy Garden
Garden for the Blind
Native Garden
Nighttime Garden
Pollinator Garden
Rain Garden
Rock Garden
Shade Garden
Water Garden
Winter Garden

Ilex crenata 'Convexa': Design Feature

Accent
Barrier
Border
Flowering Tree
Foundation Planting
Hedge
Mass Planting
Screen/Privacy
Security
Shade Tree
Small groups
Small Tree
Specimen
Street Tree
Understory Tree

Ilex crenata 'Convexa': Resistance To Challenges

Black Walnut
Compaction
Deer
Diseases
Drought
Dry Soil
Erosion
Fire
Foot Traffic
Heat
Heavy Shade
Humidity
Insect Pests
Pollution
Poor Soil
Rabbits
Salt
Slugs
Squirrels
Storm damage
Urban Conditions
Voles
Wet Soil
Wind

Ilex crenata 'Convexa': Landscape Location

Coastal
Container
Hanging Baskets
Houseplants
Lawn
Meadow
Naturalized Area
Near Septic
Patio
Pond
Pool/Hardscape
Recreational Play Area
Riparian
Rock Wall
Slope/Bank
Small Space
Vertical Spaces
Walkways
Woodland

Ilex crenata 'Convexa': Attracts

Bats
Bees
Butterflies
Frogs
Hummingbirds
Moths
Pollinators
Predatory Insects
Reptiles
Small Mammals
Songbirds
Specialized Bees