Oregon grape (Mahonia aquifolium) is an evergreen shrub native to the forests of western North America. Its glossy, holly-like leaves form dense clusters along upright stems and often develop reddish tones during winter.

In early spring the plant produces clusters of bright yellow flowers that are rich in nectar and attract early pollinators. These flowers later develop into small blue-purple berries that resemble grapes and are sometimes used in preserves.

The plant thrives in shaded woodland environments and often grows along forest edges and beneath larger trees. It spreads slowly through underground rhizomes and can form colonies over time.

The bright yellow inner bark of the roots contains potent medicinal compounds that have long been valued in herbal medicine, particularly for supporting liver health, digestion, and inflammatory skin conditions. Other useful species are Mahonia nervosa, and Mahonia repens.