Mahonia repens - (Lindl.)G.Don.

(Lindl.)G.Don.

Creeping Oregon Grape, Creeping barberry, Grape Oregon

Berberidaceae Edible: Fruit, Oil Potential hazards — see below

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Description

Mahonia repens is an evergreen Shrub growing to 0.3 m (1ft) by 2 m (6ft 7in) at a medium rate. See above for USDA hardiness. It is hardy to UK zone 5. It is in leaf all year, in flower from April to May. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. The plant is self-fertile. It is noted for attracting wildlife. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and can grow in heavy clay soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers dry or moist soil.

Edible Uses

Oil. Fruit - raw or cooked. The berries are edible and make excellent jelly, syrup, or juice when sweetened. Their flavor is pleasantly tart, similar to currants or unsweetened blueberries. The fruits are too sour to eat in large quantities raw but have good nutritional value and were historically a valuable wild food. An acid flavour but it is rather nice raw, especially when added to muesli or porridge. Unfortunately, there is relatively little flesh and a lot of seeds. Used for making jams. jellies etc. They can also be made into a refreshing lemonade-like beverage. When sugar is added, the fruit juice is similar to grape juice. The fruit is about 9mm in diameter. Taste, Processing & Kitchen Notes: Fresh berries have a sharp, sour flavor due to natural malic and citric acids. Cooking softens the seeds and releases the deep purple-red pigment into the liquid, producing a rich juice similar to grape or black currant. When sweetened, it becomes refreshing and flavorful. To prepare, simmer the berries gently for 15–20 minutes, mash, and strain through muslin. The strained juice can be sweetened and reduced into syrup or combined with apple or crabapple juice for jelly. Dried berries become leathery and somewhat sweeter. Because of the high acidity, creeping barberry is ideal for preserves and beverages rather than fresh eating. Seasonality (Phenology): Creeping barberry flowers from April to July depending on elevation. Fruits ripen from mid-summer through early autumn (July–September) and may persist into early frost. Evergreen leaves provide color year-round, shifting from green to bronze as temperatures cool. Harvest & Processing Workflow: Harvest berries in mid- to late summer when blue-purple and easily detached. Gently strip clusters by hand or clip with scissors. Rinse to remove dust, mash, and simmer for juice extraction. Strain and sweeten for syrups or jellies. Berries can also be air-dried for teas or snacks. Traditional / Indigenous Use Summary: Tribes including the Kootenai, Salish, and Blackfoot used creeping barberry for food, dye, and medicine. The berries were dried, mashed, or cooked into sauces, while roots and stems yielded yellow dye and medicinal teas for stomach ailments. It also featured in traditional beverages mixed with chokecherries or serviceberries.

Medicinal Uses

Alterative Anaphrodisiac Antibacterial Antiseptic Antitumor Cholagogue Depurative Diuretic Dysentery Expectorant Febrifuge Laxative Salve Tonic. The root and root bark is alterative, anaphrodisiac, antiseptic, cholagogue, depurative, diuretic, expectorant, febrifuge, laxative and tonic. It improves the digestion and absorption and is taken internally in the treatment of coughs, fevers, psoriasis, syphilis, haemorrhages, stomach complaints, kidney problems and impure blood conditions. Externally, it is used as an antiseptic and healing wash or poultice on wounds and rheumatic joints. The roots are harvested in late autumn or early spring and dried for later use. A poultice of the fresh berries has been applied to boils. Berberine, universally present in rhizomes of Mahonia species, has marked antibacterial effects and is used as a bitter tonic. Since it is not appreciably absorbed by the body, it is used orally in the treatment of various enteric infections, especially bacterial dysentery. It should not be used with Glycyrrhiza species (Liquorice) because this nullifies the effects of the berberine. Berberine has also shown antitumour activity. The root and root bark are best harvested in the autumn.

Known Hazards

The berries are safe to eat in moderation. Roots, bark, and stems contain berberine, which should not be ingested except in regulated herbal preparations. Overconsumption of berries may cause mild stomach upset due to acidity.

Distribution

Western N. America.

Where It Grows

NORTHERN AMERICA: Canada, Alberta (south), British Columbia (south), United States, Minnesota (central), Nebraska (northwest), South Dakota (w. & n.e.), Colorado, Idaho, Montana, Oregon, Washington, Wyoming, New Mexico, Texas, Arizona, California (northeast), Nevada, Utah,

Cultivation

An easily grown plant, it thrives in any good garden soil, preferring one on the dryish side. Grows well in heavy clay soils. Succeeds in the light shade of trees. This species is hardy to about -15°c if growing in a sheltered position. Established plants sucker freely and form quite dense thickets. The flowers are scented. Resistant to honey fungus. An evergreen. A clumping plant, forming a colony from shoots away from the crown but with a limited spread. The berries are typically harvested in late summer to early autumn when they are fully ripe. Mahonia flowers in late winter to early spring producing clusters of yellow flowers. Mahonia species are moderate to fast growers, typically reaching maturity in about 2 to 3 years, depending on the specific species and growing conditions. Mahonia species are generally self-fertile, but cross-pollination can improve fruit set.

Propagation

Seed - best sown as soon as it is ripe in a cold frame. It usually germinates in the spring. 'Green' seed (harvested when the embryo has fully developed but before the seed case has dried) should be sown as soon as it is harvested and germinates within 6 weeks. Stored seed should be sown as soon as possible in late winter or spring. 3 weeks cold stratification will improve its germination, which should take place in 3 - 6 months at 10°c. Prick out the seedlings when they are large enough to handle and grow them on in a cold frame for at least their first winter. Plant them out in late spring or early summer. Division of suckers in spring. Whilst they can be placed direct into their permanent positions, better results are achieved if they are potted up and placed in a frame until established. Leaf cuttings in the autumn.

Other Uses

Dye Oil Soil stabilization. Creeping barberry is a vital forest groundcover that unites beauty, utility, and resilience. Its berries offer modest but valuable nutrition, while its evergreen foliage enriches soil health and biodiversity. For gardeners and foragers alike, it represents the intersection of ecological function and edible potential. Agroforestry uses: Mahonia can be used as a hedge or ornamental plant and provides ground cover. The dense foliage offers shelter for wildlife and beneficial insects, and the berries attract birds. A yellow dye is obtained from the inner bark of the stem and roots. It is green. Dark green, violet and dark blue-purple dyes are obtained from the fruit. A green dye is obtained from the leaves. Plants form suckers freely, making a good dense ground cover, though they can be slow to become established and will need weeding for their first few years after planting out. The sub-species M. repens rotundifolia has been especially recommended. A useful plant for preventing soil erosion on slopes.