Pieris japonica 'Ralto'

RHS Plant Profile
pieris 'Ralto'

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pieris 'Ralto' visionspictures.com
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RHS Recommended

Plants for pollinators
Shrubs
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A spreading, compact, evergreen shrub to 1.5m tall, with irregular creamy white- to yellow-margined leaves, which emerge orange-flushed and mature to mid-green, and dark red flowers from spring, which fade to deep pink by midsummer

Position

Full sun, Partial shade

Soil Types

Loam, Sand

Max Height

1-1.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
10–20 years
Max Spread
0.5-1 metres
Max Height
1-1.5 metres

Growing Conditions

Loam Sand
Moisture
Moist but well–drained or Well–drained
pH
Acid

Position

Full sun Partial shade
Aspect
South–facing or East–facing or West–facing
Exposure
Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H5

RHS Recommended: for People & Planet

RHS Recommended Plants for People & Planet

For Water Resilience

Plants for Flood Resilience

Plants that can help manage heavy rain by catching rainfall, slowing surface run-off, encouraging water into the soil or taking it up through their roots, contributing to flood resilient gardens.

Plants for both Wet and Dry Conditions

Plants that cope with changing soil moisture, including wet winters and extended summer dry. Once established, they grow as wet and dry conditions alternate.

For Temperature Resilience

Plants for Temperature Cooling

Plants that cool air temperature by providing shade, transpiration, or reflection to reduce heat impact on people, animals, soil or other ground surface.

Plants for Wind Shelter

Plants with dense canopies often grown as a tall thick hedge or grouping can block wind and shelter gardens, buildings and people.

For Carbon Storage

Plants for Carbon Storage

Plants that can take up carbon (CO₂) through photosynthesis and store it within the plant or deposit it by their roots into the soil.

For Biodiversity

Plants for Pollinators

Plants that have flowering properties (pollen and/or nectar) that are particularly beneficial for pollinating insects such as bees, butterflies and hoverflies.

Growing conditions for maximum benefit

This plant will provide the maximum benefits if it is healthy and allowed to grow to maturity

For Bio-Diversity

  • Plants for Pollinators

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Ericaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Bushy
Potentially harmful
Harmful if eaten. Wear gloves and other protective equipment when handling. Pets (dogs, cats, rabbits, rodents, tortoises): Harmful if eaten - For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus
Pieris are compact evergreen shrubs with leathery, dark green leaves, often brightly coloured when young, and small white urn-shaped flowers borne in panicles in spring
Name Status
Accepted

How to Grow

Cultivation

Grows well in acidic, moderately fertile, humus-rich soil but may need some protection in winter when young. See pieris for futher advice

Propagation

Propagate by softwood cuttings in early summer or semi-hardwood cuttings in late summer. Some bottom heat may be required

Suggested planting locations and garden types

  • Cottage and informal garden
  • City and courtyard gardens
  • Patio and container plants
  • Wildlife gardens
  • Flower borders and beds

Pruning

pruning group 8

Pests

May be susceptible to pieris lacebug

Diseases

May be susceptible to honey fungus (rarely), Phytophthora root rot, and fungal leaf spot