Oregon Grape

(Mahonia aquifolium / Berberis aquifolium)

Basic Identification

Common Names
Oregon grape
Oregon grape root
Holly-leaved barberry

Botanical Name
Mahonia aquifolium
Synonym: Berberis aquifolium

Plant Family
Berberidaceae (Barberry family)

Parts Used
• Root and rhizome (primary medicinal parts)
• Stem bark (secondary use)

Habitat and Native Range

Oregon grape is native to western North America, particularly:
• the Pacific Northwest
• parts of western Canada and the United States

It grows best in:
• forest edges
• shaded woodlands
• mountainous regions
• well-drained soils

Oregon grape is an evergreen shrub that thrives in cool, temperate climates and is commonly found in both wild landscapes and cultivated gardens.

It is widely valued in herbal medicine for its bitter, antimicrobial, and digestive-supporting properties, and has a long history of use in traditional Western and Indigenous herbal practices.

Overview

Oregon grape is a bitter, antimicrobial, and digestive-supporting herb widely used in Western herbalism for its effects on the liver, digestion, and microbial balance. It is especially valued for its content of berberine, a compound with strong activity against a range of pathogens.

Unlike gentle, nutritive herbs, Oregon grape works in a more direct and corrective way, helping to clear excess, reduce microbial overgrowth, and stimulate digestive function. It is particularly useful in conditions involving sluggish digestion, liver stagnation, or imbalance in the gut microbiome.

Oregon grape is best used short-term or in targeted protocols, rather than as a daily tonic, making it a key herb in clinical herbal practice for addressing underlying imbalances.

Basic Uses

Oregon grape is commonly used for:

• Sluggish digestion and low stomach acid
• Liver support and bile stimulation
• Microbial imbalance (bacterial or fungal)
• Skin conditions associated with internal imbalance
• Mild to moderate digestive infections
• Blood sugar support (adjunctive use)

Botanical Description / Morphology

Growth Habit
Evergreen, low-growing to medium shrub, typically 3–6 feet tall, with a spreading, clumping growth pattern. Often forms dense patches over time.

Stem
• Woody stems
• Upright to slightly spreading
• Older stems become thicker and more rigid

Leaves
Arrangement: Alternate

Shape: Pinnate (compound leaves with multiple leaflets)

Leaflets:
• Oval to lance-shaped
• Thick, leathery texture
• Glossy dark green

Margin: Sharply toothed with spiny edges (resembling holly)

Surface: Smooth and waxy

Seasonal change: May turn reddish or bronze in colder weather

Venation
• Prominent central vein in each leaflet
• Clear branching vein structure

Flowers
• Small, bright yellow flowers
• Arranged in dense clusters (racemes)
• Typically bloom in early to mid-spring

Fruit
• Small, round berries
• Blue to purple with a dusty (waxy) coating
• Tart and grape-like in appearance

Roots / Rhizome
• Thick, woody root and rhizome system
• Bright yellow interior (a key identifying feature)
• Tough and fibrous

Key Identifying Features

• Holly-like, spiny evergreen leaves
• Bright yellow clustered flowers in spring
• Blue-purple berries resembling small grapes
• Yellow inner bark/root when cut or scraped

Similar Species / Lookalikes

• Other Mahonia species
→ similar appearance; many share similar properties

• Holly (Ilex spp.)
→ similar leaf shape, but lacks yellow flowers and grape-like berries

• Barberry (Berberis spp.)
→ closely related; similar medicinal properties

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