Mahonia haematocarpa - (Wooton.)Fedde.

(Wooton.)Fedde.

Red barberry, Mexican Barberry

Berberidaceae Edible: Fruit Potential hazards — see below

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Deaver Herbarium

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Deaver Herbarium

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Deaver Herbarium

Description

Mahonia haematocarpa is an evergreen Shrub growing to 3 m (9ft) by 2 m (6ft). See above for USDA hardiness. It is hardy to UK zone 7. It is in leaf all year, in flower in May. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It cannot grow in the shade. It prefers dry or moist soil.

Edible Uses

Fruit - raw or cooked. Juicy and acidic, it is used mainly for making jams and jellies in N. America. It makes an acceptable raw fruit and is especially nice when added to porridges or muesli. Unfortunately, there is relatively little flesh and a lot of seeds. The berries are edible, juicy, and highly palatable, making this one of the most valuable edible Berberis species. They can be eaten fresh, dried, or cooked. The flavor is sweet-tart, similar to raspberries or currants, though somewhat seedy. Excellent wild fruit for deserts; small but flavorful. Taste, Processing & Kitchen Notes: Fresh berries have a bright, tangy flavor, balancing acidity and sweetness. They are among the few truly juicy fruits native to desert ecosystems. Seeds are hard but small; they can be eaten or strained out for smoother preparations. Boiling the berries releases a rich, red-purple juice ideal for syrups, jellies, and fruit leathers. The flavor improves with sweetening, making it a good candidate for barberry jelly, syrup, or wine. To prepare, wash the berries thoroughly and simmer with water for 10–15 minutes. Strain through a fine cloth and sweeten to taste. The liquid can be reduced into a syrup or fermented for wine. Dried berries become sticky and candy-like, developing concentrated sweetness. Seasonality (Phenology): Red barberry flowers in late winter through early spring (February–May), often before many other shrubs leaf out. Fruits ripen in early to mid-summer (May–July), depending on elevation and rainfall. The evergreen leaves persist year-round, though older foliage may yellow slightly in hot summers. Harvest & Processing Workflow: Harvest ripe, dark red berries in May–July, when they are soft and glossy. Clip clusters carefully using gloves to avoid spines. Rinse to remove dust and insects. Fruits may be eaten fresh or processed immediately into jams or syrups. For drying, spread berries on mesh trays in shade; protect from ants and flies. Look-Alikes & Confusion Risks: Red barberry closely resembles Fremont’s barberry (B. fremontii), but is typically smaller and less glaucous, with smaller, rounder berries and more reddish coloration. Leaves of B. haematocarpa are narrower, and its fruits are consistently juicy rather than inflated. Traditional / Indigenous Use Summary: Tribes, including the Apache, Navajo, Pima, and Tohono O’odham, used red barberry extensively. The berries were eaten raw, dried, or cooked, and the roots and bark were used for yellow dye and digestive medicine. Some groups made tonic teas from the roots or crushed bark as a disinfectant. The fruit’s juice was also used as a natural coloring agent in food preparation.

Medicinal Uses

Antibacterial Antitumor Dysentery Ophthalmic Tonic. Inner wood shavings can be soaked in water to make an eyewash. 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 for human consumption, but the roots, bark, and inner wood contain berberine, a bioactive alkaloid with antimicrobial and hypotensive properties. These tissues should not be ingested except under professional supervision. Berberine can cause gastrointestinal upset if misused.

Distribution

South-western N. America - Texas, Colorado, New Mexico and Mexico.

Where It Grows

NORTHERN AMERICA: United States (Colorado (southeast), New Mexico (south), Texas, Arizona, California (southeast), Nevada (south)), Mexico (Sonora (north))

Cultivation

Adapted to desert and semi-desert conditions, this shrub thrives in rocky, well-drained soils and full sun. It is tolerant of alkaline, calcareous, and gravelly substrates. Once established, B. haematocarpa requires little water and can survive prolonged droughts. Unlike most members of this genus, this species requires a dry, perfectly drained position in full sun, a gritty slightly acid soil is best. It grows best on a sunny south facing wall in Britain and does well in a hot, dry position. It requires a position sheltered from strong or cold winds. Plants are only hardy in the milder areas of the country, tolerating temperatures down to about -10°c when fully dormant. The young growth in spring can be damaged by late frosts. The flowers are fragrant. A very ornamental plant, but it does not fruit freely in Britain, the climate is too dull. This species is very closely related to M. fremontii, being distinguished by the fruit which is blue-black in M. fremontii and red in M. haematocarpa. Hybridizes freely with other members of this genus. Resistant to honey fungus. Identification & Habit: Berberis haematocarpa is an evergreen shrub reaching 1–3 m (3–10 ft) in height, with multiple erect stems arising from a woody base. The inner bark and roots are bright yellow, rich in the alkaloid berberine. Leaves are pinnately compound, each consisting of 5–9 stiff, lanceolate to ovate leaflets. The leaflet margins are armed with sharp spines and the upper surfaces are glaucous gray-green to bluish, an adaptation to strong sun and drought. The flowers appear in spring (February to June), forming small racemes of 3–8 bright yellow blooms that perfume the desert air. Each flower has six sepals and six petals that look alike and form a small cup. By early summer, the shrub is covered in scarlet or reddish-purple berries about 5–8 mm in diameter, which often have a powdery (glaucous) coating. These berries can persist into midsummer or early autumn. Seasonality (Phenology): Red barberry flowers in late winter through early spring (February–May), often before many other shrubs leaf out. Fruits ripen in early to mid-summer (May–July), depending on elevation and rainfall. The evergreen leaves persist year-round, though older foliage may yellow slightly in hot summers. Habitat & Range: Native to the southwestern United States—particularly southern Arizona, southern New Mexico, and western Texas—and extending into northern Mexico. It is common on desert slopes, washes, and foothills between 1,000–2,200 m (3,300–7,200 ft). Often found with desert oak, acacia, or juniper in transition zones between desert scrub and woodland. B. haematocarpa is valued in native plant horticulture for its toughness and color. It grows best in full sun and lean soils. Overwatering or rich soil can reduce flowering and encourage disease. It can be pruned lightly after fruiting to maintain form. The plant’s deep yellow wood can be used for natural dyes. Pests & Problems: Generally resistant to pests and diseases. Occasional rust infections (Puccinia spp.) may appear but rarely cause significant harm. In overly moist or fertilized soils, root rot can occur. Berries are highly susceptible to insect larvae—always inspect before consuming. Cultivar / Selection Notes: There are no formal named cultivars, but horticultural selections exist emphasizing berry size, fruit color intensity, and compact growth habit. These are sometimes sold as “red desert hollygrape.”

Propagation

Seed - best sown as soon as it is ripe in a greenhouse. 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 the greenhouse for at least their first winter. Plant them out in late spring or early summer and consider giving them some protection from the cold for their next winter. 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

DyeA green dye is obtained from the roots. Yellow according to another report. A green dye is obtained from the leaves. Dark green, violet and dark blue-purple dyes are obtained from the fruit. Ecology & Wildlife: An important nectar and fruit source for desert wildlife. Early-season flowers attract bees and native pollinators, while fruits feed birds, coyotes, foxes, and rodents. The spiny foliage provides nesting cover for small birds. It also supports insect biodiversity in otherwise sparse desert ecosystems.