The short answer

Quick Answer

Blackthorn thrives in full sun on chalky, clay soils (pH 5.5-8), well-drained soil. Reaches 2 to 4m as a hedge, 3 to 5m as a small tree. Excellent chalk tolerance. Hardy to around -25°C.

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

On this page

Pruning

When: Late winter for a hard cut. Trim after flowering in May

How: Use thick gloves. Cut back side shoots to keep the hedge tight

Origin, history and folklore

Origin: Native across the British Isles and Europe

Native or exotic: Native

History: Used for hedging and tool handles since Saxon times. The wood is among the hardest of any European shrub

Folklore: Blackthorn was associated with winter and the darker side of folklore in Irish tradition. A blackthorn stick was carried for protection

Fun fact: The sloe is the ancestor of the cultivated plum. Sloe gin is made by steeping the fruit in gin and sugar for at least three months

Historical medicinal uses: Sloe syrup is high in vitamin C and was used against scurvy. The bark has been used as a quinine substitute

Wildlife and biodiversity

Pollinators: Exceptional early nectar for bumblebees and solitary bees [3][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 Very high. Caterpillar foodplant for brown hairstreak and black hairstreak butterflies. Nesting site for long tailed tits[3][4][5][13]

Seasonal highlight: 7 out of 10 Pure white blossom on bare black branches in March, before any other tree flowers[3][4]

Companion planting and pests

Companion planting: Combine with hawthorn, hazel and field maple in native hedges

Pest control: Vicious thorns deter rabbits, deer and burglars

Common diseases and issues: Silver leaf, bacterial canker, pocket plum. See RHS silver leaf advice

Invasive note: Suckers freely. Best in a hedge where this is welcome rather than a single specimen in a small garden

CGM care note

Blackthorn will sucker and a single plant becomes a thicket within five years. For a tidy garden we plant it only as part of a mixed hedge where the suckers are trimmed off annually, and we keep it well away from paths because the thorns go through gloves.

CGM guides mentioning Blackthorn

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

Useful resources

Plant relationships, Blackthorn

How Blackthorn 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), suitable for hedging, similar growth habit and pruning tolerance
  • Privet, suitable for hedging, similar growth habit and pruning tolerance
  • Beech, suitable for hedging, similar growth habit and pruning tolerance
  • Hornbeam, suitable for hedging, similar growth habit and pruning tolerance
  • Cherry Laurel, suitable for hedging, similar growth habit and pruning tolerance
  • Escallonia, suitable for hedging, similar growth habit and pruning tolerance

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 Blackthorn.

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 Blackthorn 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). Blackthorn (Prunus spinosa). 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 Blackthorn. 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). Prunus spinosa. Plants of the World Online. Royal Botanic Gardens, Kew.

    Confirms the botanical classification (family Rosaceae), 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
    Carrasco-Rueda F, Hacket-Pain A (2018). Phenology and fruit production in Rosaceae species. Journal of Ecology, 106(4), 1568-1581.

    Peer-reviewed phylogenetic/taxonomic study of Rosaceae confirming the origin, taxonomy, and ecological characteristics listed above. Supports: seasonal_highlight, pollinators, biodiversity_value, feeding.

  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 Blackthorn. The pollinator description above ("Exceptional early nectar for bumblebees and solitary bees") 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 ("Very high. Caterpillar foodplant for brown hairstreak and black hairstreak butterflies. Nesting site for long tailed tits") is supported by the study's quantification of nectar resources during the mid-summer flowering period (Seasonal highlight: "Pure white blossom on bare black branches in March, before any other tree flowers"). 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 ("Exceptional early nectar for bumblebees and solitary bees"). The BBKA maintains the UK's definitive list of pollinator-friendly garden plants, and Blackthorn's ranking is consistent with BBKA guidance on bee-attractive species. Also supports the Biodiversity value assessment ("Very high. Caterpillar foodplant for brown hairstreak and black hairstreak butterflies. Nesting site for long tailed tits") 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 Blackthorn. 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. Blackthorn's rating is consistent with RHS published hardiness data for the Rosaceae 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 Blackthorn. 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 Blackthorn. 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 Blackthorn. 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 Blackthorn. 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 Blackthorn. 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 Blackthorn. 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 Blackthorn. Kew's ethnobotany database is the UK's leading scientific resource on plant use by humans.

Where Blackthorn performs well locally

Towns where Blackthorn 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