Description
Quick Facts
- Common Name: Keisk’s Leucothoe, Royal Ruby Switch Ivy
- Botanical Name: Leucothoe keiskei ‘Royal Ruby’
- Plant Type: Evergreen shrub
- Mature Height: 60-80cm
- Mature Spread: 80-100cm
- Flowering Period: May to June
- Flower Colour: White, fragrant bell-shaped clusters
- Foliage: Green leaves with stunning ruby-red new growth, deepening to burgundy in winter
- Hardiness: RHS H5 (-15°C to -10°C)
- Soil Requirements: Moist, well-drained, acidic soil (pH 4.5-6.5)
- Aspect: Partial to full shade
- Maintenance: Low
Description
Like precious gemstones scattered through Ireland’s woodland gardens, Leucothoe keiskei ‘Royal Ruby’ brings regal splendour to the shadiest corners with its crown of jewel-toned foliage. This compact treasure earned its noble name from the spectacular ruby-red flush that adorns each new leaf, creating a living tapestry that shifts and changes with the seasons.
In late spring, delicate white flowers emerge like tiny lanterns strung along gracefully arching stems, their sweet fragrance drawing both gardeners and beneficial insects into its enchanting embrace. But it’s the foliage that truly steals the show – fresh growth emerges in brilliant shades of ruby and coral, gradually maturing to deep green before transforming into rich burgundy and wine tones as winter approaches.
This Japanese beauty has found its perfect home in Ireland’s cool, moist climate, where it thrives in those challenging shaded spots that leave many gardeners scratching their heads. Its naturally compact habit makes it ideal for smaller gardens, containers, or as groundcover beneath taller shrubs, whilst the year-round colour provides constant interest in woodland schemes.
The low, spreading growth creates beautiful textural contrast when planted alongside upright companions like Pieris or Rhododendrons, whilst its tolerance for deep shade makes it invaluable for brightening dark corners with living colour.
Caragh Garden Notebook
Plant in autumn or early spring, selecting a sheltered position with consistent moisture and protection from harsh winds. Space plants 80cm apart to allow for their natural spreading habit whilst creating effective groundcover.
Prepare planting sites with generous amounts of leaf mould, well-rotted compost, or ericaceous compost to create the acidic, humus-rich conditions this woodland gem requires. In areas with heavy clay, improve drainage by incorporating coarse grit whilst maintaining moisture-retentive qualities.
Apply a thick mulch of bark chips or leaf mould annually in spring to suppress weeds, conserve moisture, and gradually improve soil acidity. Water regularly during dry periods, particularly in the first year whilst the root system establishes.
Minimal pruning is required due to the plant’s naturally tidy habit, though any damaged or wayward growth can be removed after flowering. Feed with ericaceous fertiliser in early spring to encourage the spectacular coloured foliage that makes this variety so special.
In exposed locations, provide shelter from cold winds to protect the delicate new growth and maintain the plant’s pristine appearance throughout Ireland’s changeable weather.