Cramp Bark

(Viburnum opulus / Viburnum trilobum)

Basic Identification

Common Names
Cramp bark
Highbush cranberry
Guelder rose
Snowball tree

Botanical Name
Viburnum opulus
Closely related North American species: Viburnum trilobum

Plant Family
Adoxaceae (formerly Caprifoliaceae)

Parts Used

• Bark (primary medicinal part)
• Occasionally berries (food use in some species, not primary medicinal use)

The medicinal bark is typically harvested from stems and branches.

Habitat and Native Range

Cramp bark is native to:
• Europe
• Northern Asia
• North America (related species)

It commonly grows in:
• moist woodlands
• stream banks
• forest edges
• wetlands and thickets

Cramp bark grows best in:
• moist fertile soil
• partial sun to full sun
• cool temperate climates
• woodland environments

Cramp bark has a long history of use in Western and Eclectic herbal traditions, particularly for muscle tension, spasms, menstrual cramping, and nervous system constriction.

Overview

Cramp bark is a classic relaxing antispasmodic herb traditionally used to relieve muscular tension, cramping, and constriction throughout the body. It is especially valued for spasmodic conditions involving the reproductive system, digestive tract, and skeletal muscles.

Despite its somewhat plain reputation, cramp bark is deeply effective when used appropriately for tension-driven pain patterns. It is particularly useful when muscles feel tight, clenched, knotted, or locked into spasm.

Cramp bark is most commonly associated with menstrual cramping, but its traditional use extends far beyond the reproductive system. It has historically been used for muscle spasms, nervous tension, back tightness, digestive cramping, and stress-related muscular constriction.

Unlike strongly sedating herbs, cramp bark primarily works by softening tension and reducing involuntary muscular contraction.

Basic Uses

Cramp bark is commonly used for:

• Menstrual cramping and uterine tension
• Muscle spasms and muscular tightness
• Back tension and stress-related constriction
• Digestive cramping and intestinal spasms
• Nervous tension held physically in the muscles
• Tension headaches associated with tight musculature
• Restless muscular states and spasticity
• Stress-related clenching and holding patterns

Botanical Description / Morphology

Growth Habit

Large deciduous shrub, typically growing 8–15 feet tall, with an upright branching structure and rounded growth habit.

Stem & Bark

Young branches:
• smooth
• gray to reddish-brown

Mature bark:
• gray-brown
• slightly roughened or fissured with age

Medicinal bark is harvested from young branches and stems.

Leaves

Arrangement: Opposite

Shape:
• Broadly lobed
• Maple-like appearance with 3 lobes common

Margin: Serrated or toothed edges

Surface: Smooth to slightly textured

Color:
• Bright green during growing season
• Red to purple coloration in autumn

Venation

• Prominent branching veins radiating outward through each lobe

Flowers

Type: Flat-topped clusters (cymes)

Color: White to creamy white

Structure: Outer sterile flowers surrounding smaller fertile inner flowers

Bloom Time: Late spring to early summer

Fruit

• Bright red berry-like drupes
• Often persistent into winter
• More commonly associated with food or wildlife value than medicinal bark use

Roots

• Woody spreading root system typical of deciduous shrubs

Key Identifying Features

• Opposite lobed leaves resembling small maple leaves
• Flat white flower clusters
• Bright red berry clusters
• Gray-brown medicinal bark harvested from branches
• Upright woodland shrub growth habit

Similar Species / Lookalikes

• Other Viburnum species
→ many appear similar; some are used medicinally, others primarily ornamental

• Maple saplings
→ similar leaf shape but different branching pattern and flower structure

• Elderberry (Sambucus spp.)
→ somewhat similar flower clusters but different leaves and fruit structure

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