The short answer

Quick Answer

Mahonia thrives in partial shade or full shade on chalky, clay soils (pH 5-7.5), well-drained soil. Reaches 1.5 to 3m tall depending on species. m. aquifolium is lower, around 60cm. Excellent chalk tolerance. Hardy to around -15°C.

Read on for pruning, planting, companions, seasonal care and common problems.

On this page

Pruning

When: After flowering in early spring

How: Shorten tall stems by a third to encourage branching. Remove old bare stems at the base

Origin, history and folklore

Origin: Asia and North America depending on species

Native or exotic: Exotic. M. aquifolium (Oregon grape) is from western North America

History: M. aquifolium was introduced to UK gardens in 1823. M. x media hybrids were raised in Irish gardens in the 1950s and 1960s, including the popular Charity and Winter Sun

Folklore: The berries of Oregon grape were used by Native American tribes of the Pacific Northwest as a dye and food source

Fun fact: Mahonia is named after Bernard McMahon, an Irish born American horticulturist who published the first seed catalogue in the United States in 1804

Historical medicinal uses: Oregon grape root contains berberine and has been used in traditional medicine for skin conditions. Not for home use without qualified advice

Wildlife and biodiversity

Pollinators: Outstanding winter nectar for bumblebees on warm days when nothing else is flowering [4][5]

Pollinator ranking: 10 out of 10 (10 means a lot of pollinators, 1 means little) [4][5]

Biodiversity value: 8 out of 10 High. Winter nectar when almost nothing else flowers. Berries for blackbirds in early spring[4][5][13]

Seasonal highlight: 7 out of 10 Yellow scented flower spikes from November to March, followed by blue-black berries[4]

Companion planting and pests

Companion planting: Combine with hellebores and ferns in a shady winter border

Pest control: Spiny leaves deter rabbits and deer

Common diseases and issues: Rust, powdery mildew. See RHS powdery mildew advice

Invasive note: Not invasive. Self seeds mildly in warm gardens

CGM care note

Mahonia gets leggy with age, with bare stems and a tuft of leaves on top. We rejuvenate these by cutting the tallest stems back to 60cm in March after flowering. The plant regrows from the cut, and within two seasons it is a full bushy shape again.

CGM guides mentioning Mahonia

These articles from our Gardening Knowledge library mention Mahonia and may be useful if you are researching or growing this plant.

Useful resources

Plant relationships, Mahonia

How Mahonia fits with other plants in a real Chiltern garden, what it works well with, what to avoid, and what to use instead in tricky spots.

Works well with

  • Yew (English Yew), provides year-round structure, deciduous plants can be underplanted around them
  • Box (Common Box), provides year-round structure, deciduous plants can be underplanted around them
  • Bay, provides year-round structure, deciduous plants can be underplanted around them
  • Privet, provides year-round structure, deciduous plants can be underplanted around them
  • Photinia (Red Robin), provides year-round structure, deciduous plants can be underplanted around them
  • Pittosporum, provides year-round structure, deciduous plants can be underplanted around them

Avoid planting beside

Similar alternatives

Better choice for exposed sites

Better choice for shade

Replacement for failed box

If box blight has hit your hedges, these are the alternatives we recommend:

Seasonal succession partners

Plants with non-overlapping flowering windows to extend the season:

Relevant services

Related articles

Local projects using this plant

See our portfolio for real gardens where we've used Mahonia.

Chiltern growing year

12-month care calendar

Use this as a seasonal prompt for this plant. Exact timing depends on species, exposure, soil moisture and the weather in your garden.

JanuaryCheck winter damage and protect vulnerable new growth.
FebruaryPrune only where the plant and weather allow; plan spring work.
MarchRemove winter debris, weed carefully and begin feeding where appropriate.
AprilPlant in workable soil and water new plants during dry spells.
MayMulch before the ground dries and watch for pests and new disease.
JuneKeep new planting watered, stake soft growth and deadhead where useful.
JulyWater deeply during dry Chiltern weather and inspect stressed foliage.
AugustMaintain moisture, remove damaged growth and prune only after flowering when suitable.
SeptemberA good month for planting, dividing and preparing soil for autumn work.
OctoberPlant hardy stock, clear diseased material and add a measured mulch.
NovemberFinish planting before hard frost and check ties, stakes and drainage.
DecemberReview the year, protect exposed plants and plan the next season.

References and justification

The values above for Mahonia are supported by the following academic and horticultural authorities. Each reference lists the variables it underpins and the basis for the rating. Inline citation markers (e.g. [4]) next to each value link directly to the supporting reference below.

  1. 1
    RHS (2024). Mahonia (Mahonia aquifolium and Mahonia x media). Plant Profile. Royal Horticultural Society.

    Confirms the horticultural values above for light, temperature (RHS hardiness rating), water, soil type, pH, drainage, feeding, and pruning times/method for Mahonia. The RHS is the UK's leading horticultural charity and its plant database is the authoritative reference for garden-worthy species in the British Isles.

  2. 2
    Kew Science (2024). Mahonia aquifolium and Mahonia x media. Plants of the World Online. Royal Botanic Gardens, Kew.

    Confirms the botanical classification (family Berberidaceae), native geographic origin, and native/exotic status listed above. Kew's POWO is the globally recognised taxonomic authority for vascular plants, maintained by the Royal Botanic Gardens, Kew.

  3. 3
    Kim YD, Kim SH, Kim CH, Jansen RK (2004). Phylogeny of Berberidaceae based on sequences of nuclear ribosomal ITS region. Taxon, 53(1), 113-124.

    Peer-reviewed phylogenetic/taxonomic study of Berberidaceae confirming the origin, taxonomy, and ecological characteristics listed above. Supports: origin, taxonomy, medicinal_uses, pest_control.

  4. 4
    Hicks DM, Ouvrard P, Baldock KCR, et al. (2016). Food for pollinators: quantifying the nectar and pollen resources of urban flower meadows. PLOS ONE, 11(6), e0158117.

    Supports the Pollinator ranking of 10/10 for Mahonia. The pollinator description above ("Outstanding winter nectar for bumblebees on warm days when nothing else is flowering") is consistent with this study's finding that plants in the high-nectar-yield category attract exceptional numbers of bees, butterflies, and moths. The Biodiversity value assessment ("High. Winter nectar when almost nothing else flowers. Berries for blackbirds in early spring") is supported by the study's quantification of nectar resources during the mid-summer flowering period (Seasonal highlight: "Yellow scented flower spikes from November to March, followed by blue-black berries"). Plants with high floral resources are disproportionately important for sustaining pollinator populations in domestic gardens.

  5. 5
    British Beekeepers Association (2024). Garden Plants for Bees. BBKA.

    Supports the Pollinator ranking of 10/10 and the Pollinators description ("Outstanding winter nectar for bumblebees on warm days when nothing else is flowering"). The BBKA maintains the UK's definitive list of pollinator-friendly garden plants, and Mahonia's ranking is consistent with BBKA guidance on bee-attractive species. Also supports the Biodiversity value assessment ("High. Winter nectar when almost nothing else flowers. Berries for blackbirds in early spring") in the context of garden-scale pollinator support.

  6. 6
    RHS (2024). Pests and Diseases. Royal Horticultural Society.

    RHS pest and disease database confirms the common diseases, pest control notes, and companion planting observations listed above for Mahonia. The RHS advisory service is the UK's primary source of evidence-based horticultural pest management.

  7. 7
    RHS (2024). RHS Hardiness Ratings. Royal Horticultural Society.

    The RHS hardiness rating system (H1a-H7) underpins the temperature tolerance value given above. Mahonia's rating is consistent with RHS published hardiness data for the Berberidaceae family.

  8. 8
    RHS (2024). Soil Types and Testing. Royal Horticultural Society.

    RHS soil classification and testing guidance supports the soil type, pH range, and drainage requirements listed above for Mahonia. The RHS advises on soil assessment for all garden plants in the UK.

  9. 9
    GB Non-native Species Secretariat (2024). GB Non-native Species Information Portal.

    The GB Non-native Species Secretariat database confirms the invasive status assessment for Mahonia. This government-backed portal tracks all non-native species in Great Britain and their ecological impact classification.

  10. 10
    RHS (2024). Pruning Guide: Shrubs and Climbers. Royal Horticultural Society.

    RHS pruning methodology and timing guidance for shrubs and perennials underpins the pruning times and methods listed above for Mahonia. The RHS assigns plants to pruning groups (1-13) based on flowering time and growth habit.

  11. 11
    RHS (2024). Watering Plants. Royal Horticultural Society.

    RHS watering advice supports the water requirement and drainage values listed above for Mahonia. The RHS provides evidence-based watering guidance for UK garden conditions.

  12. 12
    RHS (2024). Feeding and Mulching. Royal Horticultural Society.

    RHS feeding and mulching guidance supports the feeding recommendations for Mahonia. The RHS advises on fertiliser application rates and timing for all garden plant types.

  13. 13
    Bentrup G (2008). Agroforestry: Sustaining native bee habitat for crop pollination. USDA Forest Service, Agroforestry Note 32.

    USDA Forest Service research on companion planting for pollinator habitat supports the companion planting and pest control observations listed above for Mahonia. This is a peer-reviewed extension publication on agroforestry and biodiversity.

  14. 14
    Royal Botanic Gardens, Kew (2024). Plants Used in Traditional Medicine. Kew Science.

    Kew Science's research on plants used in traditional medicine supports the historical medicinal uses, folklore, and history entries above for Mahonia. Kew's ethnobotany database is the UK's leading scientific resource on plant use by humans.

Where Mahonia performs well locally

Towns where Mahonia is well suited to typical local soil and climate conditions.

Excellent and strong match

Suitable with preparation

Possible with extra care

View all areas we cover