Dull Oregon Grape

Mahonia nervosa

Also known as Cascade Oregon Grape, Dwarf Oregon Grape, Longleaf Mahonia, Cascade Barberry

At a glance

Family

Berberidaceae (barberry family)

Type

Low, spreading broadleaf evergreen shrub

Parts used

Root and root bark (occasionally the berries)

Size

1 to 2 feet tall, spreading by underground rhizomes into loose colonies

Bloom

Early to mid spring, clusters of small bright yellow flowers

Habitat

Shady understory of coniferous forests from British Columbia through Oregon and into northern California

Acquisition

Forage or Grow

Traditional remedies in HerbSense

Key benefits

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Traditional bitter digestive tonic

Traditionally supports liver function

Traditionally used for skin complaints

Yields a natural yellow dye

Traditional uses

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Long before it had a Latin name, this low forest shrub was known to Pacific Northwest peoples including the Coast Salish, Skagit, and Cowlitz, who scraped its bright yellow inner bark and simmered the roots into bitter decoctions. The berberine that colors the wood so vividly also made the plant a go-to bitter tonic, traditionally used to stir a sluggish appetite, ease digestive complaints, and support the liver after a heavy winter of stored foods. Root preparations were also applied traditionally for skin troubles and low-grade infections, and the same golden roots were boiled down by basket weavers and settlers alike to dye wool, cedar bark, and cloth a deep, sunny yellow. It grows as a quieter, shorter-statured cousin of the more famous Oregon grape, Mahonia aquifolium, sharing its chemistry but hugging the forest floor instead of standing tall.

How to grow & use it

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Pairs well with

✦Dandelion root
✦Burdock root
✦Ginger

Substitutes

✦Oregon grape (Mahonia aquifolium)
✦Barberry root (Berberis vulgaris)

Choose it when

“For the quiet gold hidden under fir and cedar, where bitterness becomes medicine.”

Did you know?

Snap a piece of Mahonia nervosa root or bark and the wood underneath glows a startling bright yellow, a natural dye so reliable that Pacific Northwest basket weavers and early settlers alike simmered the roots down to color wool and cedar bark a sunny gold.

Safety

Dull Oregon grape contains berberine, which is avoided during pregnancy and breastfeeding and should never be given to infants due to a risk of jaundice. Berberine can also interact with certain antibiotics and blood thinners.