About this product

Rhododendron 'Hisako' – White Japanese Azalea – 11cm Pot

Rhododendron (Aronense Group) 'Hisako'

Supplied in an 11cm pot (P11)

Plant Highlights

• Abundant pure white spring flowers covering the compact shrub in May

• Small, funnel-shaped blooms that create a delicate, fresh appearance

• Dense, cushion-shaped growth ideal for smaller garden spaces

• Attractive green foliage providing structure beyond the flowering season

• Excellent for acidic-soil borders and containers in sheltered positions

Overview

Rhododendron 'Hisako' is a compact Japanese azalea valued for its generous display of pure white flowers in late spring. Also sold under the name Geisha White, this cultivar produces numerous small, funnel-shaped blooms, approximately 2.5cm across, which can cover much of the shrub during May. The fresh white flowers contrast with its neat, elliptic green leaves, giving the plant a bright, clean appearance in spring borders.

Belonging to the Aronense Group of evergreen azaleas, 'Hisako' develops slowly into a dense, low, cushion-shaped shrub that spreads more widely than it grows tall. It is particularly effective near the front of an acidic-soil border, in a sheltered woodland-style garden or in a patio container filled with ericaceous compost. Its restrained size makes it a useful choice where a larger rhododendron would eventually become too dominant.

Why We Love It

• A beautiful white flowering display: The small flowers appear in abundance, creating a bright contrast against the green foliage.

• Naturally low and spreading: Its cushion-shaped habit gives borders a soft, rounded outline without frequent shaping.

• A useful spring companion: White blooms combine particularly well with ferns, pieris and other acid-loving plants.

• Ideal for smaller planting spaces: Its slow growth suits compact gardens, border edges and carefully maintained containers.

• Attractive beyond flowering: Small green leaves provide a neat backdrop for neighbouring plants through much of the year.

Plant Details

Attribute	Information
Botanical Name	Rhododendron (Aronense Group) 'Hisako'
Cultivar	'Hisako'
Other Trade Name	Geisha White
Common Name	Japanese Azalea 'Hisako'
Plant Type	Compact evergreen to semi-evergreen flowering shrub
Flowers	Small, single, funnel-shaped white flowers, approximately 2.5cm across
Flowering Period	Late spring, mainly May; sometimes extending into early June
Foliage	Small, elliptic green leaves, brighter green when young
Growth Habit	Dense, low, cushion-shaped and spreading
Mature Height	Approximately 40–60cm
Mature Spread	Approximately 60–70cm, potentially wider in favourable conditions
Growth Rate	Slow
Position	Partial shade; gentle sun with adequate soil moisture
Soil	Acidic, humus-rich, moist but well-drained
Soil pH	Acidic
Hardiness	Cold-tolerant in suitable conditions; protect from exposed winds and severe winter weather
Pruning	Minimal; light shaping immediately after flowering
Best Uses	Acidic borders, woodland-edge planting, low shrub groups and patio containers

Growing Guide

Position and Light

Plant 'Hisako' in partial shade, ideally where it receives gentle morning sunlight and protection from strong afternoon sun.

A sheltered east-facing border or a position beneath the light canopy of taller shrubs can provide suitable conditions. The white flowers are particularly attractive in lightly shaded areas, where they brighten the planting without needing intense sunlight.

Avoid exposed sites subject to cold, drying winds, which can damage evergreen foliage and developing flower buds.

Watering and Establishment

Water thoroughly after planting and keep the soil evenly moist while the roots establish.

Azaleas have shallow root systems, so young plants can dry out quickly during warm or windy weather. Check the soil around the root ball and water when the upper layer begins to dry.

Once established, provide additional water during prolonged dry spells, particularly in late spring and summer when the plant is producing new growth and forming buds for the following year.

For container-grown plants, check compost moisture regularly and allow excess water to drain away.

Rainwater is preferable where tap water is particularly hard, as repeated watering with alkaline water can gradually affect compost acidity.

Soil and Compost

'Hisako' requires acidic, humus-rich soil that retains moisture without becoming waterlogged.

For garden planting, choose a naturally acidic border with good drainage. Leaf mould or suitable organic matter can help improve soil structure and maintain moisture around the shallow roots.

Avoid chalky or strongly alkaline soil, which can cause nutrient deficiencies and yellowing foliage.

For containers, use a quality peat-free ericaceous compost and a pot with adequate drainage holes.

Plant shallowly, keeping the top of the root ball level with the surrounding soil rather than burying the stems.

Hardiness and Winter Care

'Hisako' is a cold-tolerant Japanese azalea, but its performance depends on shelter, drainage and winter exposure.

A protected position is particularly important in Irish gardens where cold winds and prolonged wet conditions can affect shallow-rooted evergreen shrubs.

The cultivar is commonly described as evergreen, although some foliage may be shed during colder winters. This seasonal leaf loss does not necessarily indicate that the plant has failed.

Protect young container-grown plants during prolonged severe frost by moving pots to a sheltered location or insulating the containers.

Avoid allowing the compost to remain saturated through winter, and protect developing flower buds from late spring frosts where possible.

Feeding and Routine Maintenance

Apply a suitable ericaceous fertiliser in spring if needed, following the manufacturer's instructions.

A light mulch of leaf mould or suitable organic material helps conserve moisture and maintain favourable root conditions. Keep mulch away from the main stems.

'Hisako' naturally develops a compact, cushion-shaped habit and usually requires very little pruning.

If shaping is necessary, lightly trim immediately after flowering. Avoid pruning late in summer, as this may remove developing flower buds for the following spring.

Remove dead or damaged shoots when required.

Flowering and Seasonal Care

The main flowering display usually occurs in May, although weather conditions may shift flowering slightly earlier or later.

Once the flowers fade, new foliage growth helps prepare the plant for the following season.

Maintain adequate moisture through summer, particularly during dry periods, to support healthy growth and flower-bud development.

Avoid excessive feeding or hard pruning, which can disturb the cultivar's naturally compact shape.

Perfect For

• Small garden borders: Its low, spreading habit provides spring colour without the scale of a large rhododendron.

• Woodland-edge planting: White flowers stand out against ferns and other shade-loving plants in acidic soil.

• Patio containers: A suitable choice for ericaceous compost in a sheltered position with reliable watering.

• Front-of-border planting: The cushion-shaped growth creates a neat transition between paths and taller shrubs.

• Grouped azalea displays: Several plants can create a coordinated sweep of white flowers in late spring.

Good to Know

'Hisako' is also sold as Geisha White. These names refer to the same white-flowering cultivar, not two different flower colours.

Although often described as evergreen, 'Hisako' may lose some leaves during colder winters. Its compact growth and shallow roots also make shelter and consistent soil moisture important.

The plant requires acidic growing conditions. Where garden soil is alkaline, a container filled with ericaceous compost is generally the more reliable option.

Product Information

• Product: Rhododendron 'Hisako'

• Botanical Name: Rhododendron (Aronense Group) 'Hisako'

• Cultivar: 'Hisako'

• Other Trade Name: Geisha White

• Common Name: White Japanese Azalea

• Pot Size: 11cm (P11)

• Supplied Format: Potted flowering shrub

• Product Barcode / SKU: 8712044376936