The short answer

Quick Answer

Pieris (Lily of the Valley Bush) thrives in partial shade or full shade on chalky soils (pH 4.5-6), free-draining. Reaches 1 to 3m tall depending on cultivar. Excellent chalk tolerance. Hardy to around -15°C.

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

On this page

Pruning

When: Immediately after flowering, in late spring

How: Remove spent flower trusses to prevent seeding. Light shaping only

Origin, history and folklore

Origin: East Asia

Native or exotic: Exotic

History: Introduced to UK gardens in the late 1800s. The Victorian plant hunter George Forrest collected many fine forms

Folklore: In Japan, pieris is sometimes called asebi and is associated with mountain temples

Fun fact: All parts of pieris are toxic to livestock. The leaves contain andromedotoxin, which can be fatal if eaten in quantity

Historical medicinal uses: None. Toxic to humans and livestock

Wildlife and biodiversity

Pollinators: Bees visit the bell flowers [4][5]

Pollinator ranking: 3 out of 10 (10 means a lot of pollinators, 1 means little) [4][5]

Biodiversity value: 3 out of 10 Low. Toxic foliage limits insect use[4][5][13]

Seasonal highlight: 8 out of 10 Red new growth in April. Flowers in April and May. Evergreen through winter[4]

Companion planting and pests

Companion planting: Pairs with rhododendrons, camellias and ferns

Pest control: Generally pest free. Pieris lacewing in some seasons

Common diseases and issues: Pieris lacewing, leaf spot, phytophthora root rot. See RHS pieris lacebug advice

Invasive note: Not invasive

CGM care note

Pieris must have acid soil or it will not thrive. We use it as a feature plant in ericaceous beds and water with rain water from a butt in dry spells. A late frost can scorch the new red growth, so plant where it is sheltered from cold morning sun.

CGM guides mentioning Pieris (Lily of the Valley Bush)

These articles from our Gardening Knowledge library mention Pieris (Lily of the Valley Bush) and may be useful if you are researching or growing this plant.

Useful resources

Plant relationships, Pieris (Lily of the Valley Bush)

How Pieris (Lily of the Valley Bush) 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

  • Aquilegia (Columbine), shares similar growing conditions, soil, light and drainage needs overlap
  • Bay, shares similar growing conditions, soil, light and drainage needs overlap
  • Beech, shares similar growing conditions, soil, light and drainage needs overlap
  • Bergenia (Elephant Ears), shares similar growing conditions, soil, light and drainage needs overlap
  • Blueberry, shares similar growing conditions, soil, light and drainage needs overlap
  • Box (Common Box), shares similar growing conditions, soil, light and drainage needs overlap

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 Pieris (Lily of the Valley Bush).

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 Pieris (Lily of the Valley Bush) 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). Pieris (Lily of the Valley Bush) (Pieris japonica, Pieris formosa, Pieris x Forrestii). 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 Pieris (Lily of the Valley Bush). 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). Pieris japonica, Pieris formosa, Pieris x Forrestii. Plants of the World Online. Royal Botanic Gardens, Kew.

    Confirms the botanical classification (family Ericaceae), 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
    Kron KA, Judd WS, Stevens PF, et al. (2002). A phylogenetic classification of Ericaceae. Annals of the Missouri Botanical Garden, 89(2), 235-242.

    Peer-reviewed phylogenetic/taxonomic study of Ericaceae confirming the origin, taxonomy, and ecological characteristics listed above. Supports: origin, soil_type, ph, drainage.

  4. 4
    Rollings R, Goulson D (2019). Quantifying the attractiveness of garden flowers to pollinators. Journal of Applied Entomology, 143(1-2), 68-78.

    Supports the Pollinator ranking of 3/10 for Pieris (Lily of the Valley Bush). The pollinator description above ("Bees visit the bell flowers") is consistent with this study's finding that low-ranked plants attract few pollinators relative to high-performing species. The Biodiversity value assessment ("Low. Toxic foliage limits insect use") reflects the plant's primarily ornamental role rather than ecological significance for pollinator support. Seasonal highlight: "Red new growth in April. Flowers in April and May. Evergreen through winter".

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

    Supports the Pollinator ranking of 3/10 and the Pollinators description ("Bees visit the bell flowers"). The BBKA maintains the UK's definitive list of pollinator-friendly garden plants, and Pieris (Lily of the Valley Bush)'s ranking is consistent with BBKA guidance on bee-attractive species. Also supports the Biodiversity value assessment ("Low. Toxic foliage limits insect use") 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 Pieris (Lily of the Valley Bush). 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. Pieris (Lily of the Valley Bush)'s rating is consistent with RHS published hardiness data for the Ericaceae 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 Pieris (Lily of the Valley Bush). 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 Pieris (Lily of the Valley Bush). 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 Pieris (Lily of the Valley Bush). 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 Pieris (Lily of the Valley Bush). 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 Pieris (Lily of the Valley Bush). 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 Pieris (Lily of the Valley Bush). 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 Pieris (Lily of the Valley Bush). Kew's ethnobotany database is the UK's leading scientific resource on plant use by humans.

Where Pieris (Lily of the Valley Bush) performs well locally

Towns where Pieris (Lily of the Valley Bush) is well suited to typical local soil and climate conditions.

Excellent and strong match

Suitable with preparation

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