• Photo of Carpinus caroliniana (Carpinus carolinianas)

Plant Profile: Carpinus caroliniana

Taxonomy: Carpinus caroliniana

Names

American Hornbeam, Blue Beech, Hornbeam, Ironwood, Musclewood, Muscle Wood, Water Beech

  • Photo of Carpinus caroliniana (Carpinus carolinianas)

Phonetic Spelling:kar-PINE-us kair-oh-lin-ee-AN-uh

Genus:Carpinus

Species:caroliniana

Family:Betulaceae

The American Hornbeam, also known as Musclewood or Ironwood, is a deciduous tree that typically reaches heights of 30 feet. It thrives in naturally moist environments such as streambanks, riverbanks, and maritime forests. The tree features alternate leaves with a distinctly doubly serrated edge. Its bark is smooth, exhibiting a gray to bluish-gray hue, and is characterized by deep fluting. In early spring, it produces yellow-green male flowers alongside fuzzy female flowers. The tree bears small, ribbed nutlets that are supported by a three-lobed leafy bract. The American Hornbeam is a compact tree, often with one or more trunks that can be about a foot in diameter, offering an attractive appearance. The wood is exceptionally hard, capable of achieving a horn-like polish, and was historically utilized by early Americans for crafting bowls, tool handles, and ox yokes. However, due to the limited yield of wood per tree, commercial harvesting of hornbeam wood is not feasible. This species shows moderate resistance to deer damage but is particularly vulnerable to drought, high temperatures, and soil compaction.

Transplanting can be challenging, and it is best to relocate this tree in the spring. It flourishes in sandy or clay loams rich in organic matter, requiring consistent moisture and slightly acidic conditions. The American Hornbeam thrives in heavy shade, often serving as an understory tree in forests. It is suitable for naturalized settings or along the edges of streams and ponds, demonstrating tolerance for drier locations, some sunlight, and occasional flooding.

Potential issues include leaf spots, cankers, and twig blight, which can affect the health of the American Hornbeam.

**Quick Identification Tips:**

Carpinus caroliniana Feature Summary

Carpinus caroliniana Image Gallery

Tags

#deciduous
#fall color
#wildlife plant
#native tree
#cover plant
#shelter
#understory tree
#street tree
#playground
#food source
#cpp
#low flammability
#NC native
#buffer
#ponds
#children's garden
#fire resistant
#edible fruits
#naturalizes
#screening
#Braham Arboretum
#fantz
#nesting sites
#larval host plant
#food source fall
#food source herbage
#coastal FAC
#Piedmont Mountains FAC
#bird friendly
#food source hard mast fruit
#butterfly friendly
#pollinator garden
#streams
#eastern tiger swallowtail butterfly
#red-spotted purple butterfly

Similar Plants

Carpinus caroliniana is often confused with:

Carpinus caroliniana Feature Summary

Attributes
The wood has been used for tool handles, mallet heads, levers and other small wooden objects. American pioneers used it for bowls and dishes, as it is not subject to cracking.
E. Canada to SE. U.S.A., NC
AL , AR , CT , DC , DE , FL , GA , IA , IL , IN , KY , LA , MA , MD , ME , MI , MN , MO , MS , NC , NH , NJ , NY , OH , OK , PA , RI , SC , TN , TX , VA , VT , WI , WV
It is a larval host plant for the Eastern Tiger Swallowtail and Red-spotted Purple butterflies. The Eastern Tiger Swallowtail (Papilo glaucus) has three flights from February-November in the deep south and March-September in the north. The Red-spotted Purple (Limenitis arthemis astyanax) has two broods from April-October. The seed and buds provide food source for songbirds, ruffed grouse, quail, wild turkeys, foxes, and squirrels.  On young specimens, the inner bark is eaten by beavers and rabbits.  These plants also provide good cover and shelter for animals.
Edible fruit
Wildlife Food Source
Buffer
Screening
low flammability
Fruit
The nutlet is 1/3 inch long and is attached to a leaf-like 3-lobed green scale that helps it to be carried by the wind.
Gold/Yellow
< 1 inch
Flowers
Monoecious (both male and female flowers on the same tree) male catkin is 1-2.5" long, female 3/4 inch long, 3 lobed bracts, 1-1.5" long, middle of lobe the widest.
Gold/Yellow
Green
Leaves
Dull bluish green surface, paler underside, and sharp teeth. Alternate, simple, 2.5-5" long, 1-2" wide, ovate-oblong, doubly serrate, glabrous
Green
Gold/Yellow
Orange
Gold/Yellow
Orange
Red/Burgundy
Ovate
Oblong
Doubly Serrate
3-6 inches
1-3 inches
Bark
Smooth, tight, thin and bluish-gray stretched over an irregularly ridged trunk
Light Gray
Stem
Older branches develop a slate gray, smooth, irregularly fluted appearance; overall appearance is similar to a flexed bicep muscle, hence the common name muscle wood.
Gray/Silver
Whole Plant Traits
Tree
Native Plant
Multi-stemmed
Spreading
Clumping
Oval
Medium
Cultural Conditions
Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Deep shade (Less than 2 hours to no direct sunlight)
Acid (<6.0)
Neutral (6.0-8.0)
Good Drainage
Moist
Occasionally Wet
Coastal
Mountains
Piedmont
4a
4b
5b
5a
6a
6b
7a
7b
8b
8a
3a
3b
9a
9b
Clay
High Organic Matter
Loam (Silt)
Sand
Landscape
Butterfly Garden
Pollinator Garden
Children's Garden
Rain Garden
Understory Tree
Wind
Black Walnut
Fire
Heavy Shade
Recreational Play Area
Woodland
Naturalized Area
Riparian
Butterflies
Pollinators
Songbirds
Small Mammals

Carpinus caroliniana Attributes

Carpinus caroliniana: Uses (Ethnobotany)

The wood has been used for tool handles, mallet heads, levers and other small wooden objects. American pioneers used it for bowls and dishes, as it is not subject to cracking.

Carpinus caroliniana: Country Or Region Of Origin

E. Canada to SE. U.S.A., NC

Carpinus caroliniana: Distribution

AL , AR , CT , DC , DE , FL , GA , IA , IL , IN , KY , LA , MA , MD , ME , MI , MN , MO , MS , NC , NH , NJ , NY , OH , OK , PA , RI , SC , TN , TX , VA , VT , WI , WV

Carpinus caroliniana: Wildlife Value

It is a larval host plant for the Eastern Tiger Swallowtail and Red-spotted Purple butterflies. The Eastern Tiger Swallowtail (Papilo glaucus) has three flights from February-November in the deep south and March-September in the north. The Red-spotted Purple (Limenitis arthemis astyanax) has two broods from April-October. The seed and buds provide food source for songbirds, ruffed grouse, quail, wild turkeys, foxes, and squirrels.  On young specimens, the inner bark is eaten by beavers and rabbits.  These plants also provide good cover and shelter for animals.

Carpinus caroliniana: Particularly Resistant To (Insects/Diseases/Other Problems)

Fire in the landscape.

Carpinus caroliniana: Life Cycle

Annual
Biennial
Bulb
Perennial
Woody

Carpinus caroliniana: Play Value

Attractive Flowers
Attracts Pollinators
Buffer
Colorful
Defines Paths
Easy to Grow
Edible fruit
Fragrance
Pieces Used in Games
Screening
Shade
Sound
Textural
Wildlife Cover/Habitat
Wildlife Food Source
Wildlife Larval Host
Wildlife Nesting
Wind Break
Wind Shimmer

Carpinus caroliniana: Fire Risk Rating

extreme flammability
high flammability
low flammability
medium flammability

Carpinus caroliniana Fruit

Carpinus caroliniana: Fruit Description

The nutlet is 1/3 inch long and is attached to a leaf-like 3-lobed green scale that helps it to be carried by the wind.

Carpinus caroliniana: Fruit Type

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

Carpinus caroliniana: Fruit Color

grass
Gold/Yellow

Carpinus caroliniana: Fruit Value To Gardener

Edible
Fragrant
Good Cut
Good Dried
Long Bloom Season
Long-lasting
Showy

Carpinus caroliniana: Display/Harvest Time

Fall
Spring
Summer
Winter

Carpinus caroliniana: Fruit Length

< 1 inch
1-3 inches
> 3 inches

Carpinus caroliniana: Fruit Width

< 1 inch
1-3 inches
> 3 inches

Carpinus caroliniana Flowers

Carpinus caroliniana: Flower Description

Monoecious (both male and female flowers on the same tree) male catkin is 1-2.5" long, female 3/4 inch long, 3 lobed bracts, 1-1.5" long, middle of lobe the widest.

Carpinus caroliniana: Flower Color

filter_vintage
Gold/Yellow
filter_vintage
Green

Carpinus caroliniana: Flower Inflorescence

Catkin
Corymb
Cyme
Head
Insignificant
Panicle
Raceme
Solitary
Spadix
Spike
Umbel

Carpinus caroliniana: Flower Bloom Time

Winter
Spring
Summer
Fall

Carpinus caroliniana Leaves

Carpinus caroliniana: Leaf Description

Dull bluish green surface, paler underside, and sharp teeth. Alternate, simple, 2.5-5" long, 1-2" wide, ovate-oblong, doubly serrate, glabrous

Carpinus caroliniana: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Carpinus caroliniana: Leaf Color

spa
Gold/Yellow
spa
Green
spa
Orange

Carpinus caroliniana: Deciduous Leaf Fall Color

spa
Gold/Yellow
spa
Orange
spa
Red/Burgundy

Carpinus caroliniana: Leaf Type

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

Carpinus caroliniana: Leaf Arrangement

Alternate
Opposite
Other/more complex
Rosulate
Whorled

Carpinus caroliniana: 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

Carpinus caroliniana: Leaf Margin

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

Carpinus caroliniana: Hairs Present

No
Yes

Carpinus caroliniana: Leaf Length

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

Carpinus caroliniana: Leaf Width

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

Carpinus caroliniana Bark

Carpinus caroliniana: Bark Description

Smooth, tight, thin and bluish-gray stretched over an irregularly ridged trunk

Carpinus caroliniana: Bark Color

grass
Light Gray

Carpinus caroliniana: Surface/Attachment

Bumpy
Exfoliating
Fissured
Furrowed
Lenticels
Papery
Patchy
Peeling
Ridges
Scaly
Shaggy
Shiny
Shredding
Smooth
Spongy

Carpinus caroliniana: Bark Plate Shape

Diamond
Irregular
Oval
Rectangle
Round
Square

Carpinus caroliniana Stem

Carpinus caroliniana: Stem Description

Older branches develop a slate gray, smooth, irregularly fluted appearance; overall appearance is similar to a flexed bicep muscle, hence the common name muscle wood.

Carpinus caroliniana: Stem Color

grass
Gray/Silver

Carpinus caroliniana: Stem Is Aromatic

No
Yes

Carpinus caroliniana Whole Plant Traits

Carpinus caroliniana: 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

Carpinus caroliniana: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Carpinus caroliniana: 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

Carpinus caroliniana: Growth Rate

Slow
Medium
Rapid

Carpinus caroliniana: Maintenance

Low
Medium
High

Carpinus caroliniana: Texture

Fine
Medium
Coarse

Carpinus caroliniana Cultural Conditions

Carpinus caroliniana: 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)

Carpinus caroliniana: Soil pH

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

Carpinus caroliniana: Soil Drainage

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

Carpinus caroliniana: NC Region

Coastal
Mountains
Piedmont

Carpinus caroliniana: USDA Plant Hardiness Zone

thermostat
3a
thermostat
3b
thermostat
4a
thermostat
4b
thermostat
5a
thermostat
5b
thermostat
6a
thermostat
6b
thermostat
7a
thermostat
7b
thermostat
8a
thermostat
8b
thermostat
9a
thermostat
9b

Carpinus caroliniana: Soil Texture

Clay
High Organic Matter
Loam (Silt)
Sand
Shallow Rocky

Carpinus caroliniana Landscape

Carpinus caroliniana: 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

Carpinus caroliniana: 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

Carpinus caroliniana: 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

Carpinus caroliniana: 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

Carpinus caroliniana: Attracts

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