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Rhododendron 'Silver Sword' – Evergreen Japanese Azalea – 11cm Pot

Rhododendron 'Silver Sword'

Supplied in an 11cm pot (P11)

Plant Highlights: Rich pinkish-red spring flowers • Distinctive green and creamy-white variegated foliage • Compact, bushy evergreen growth • Attractive in partial shade • Excellent for acidic-soil borders and patio containers

Overview

Rhododendron 'Silver Sword' is a distinctive evergreen Japanese azalea that combines colourful spring flowers with unusually attractive variegated foliage. During April and May, clusters of rich rose-red to purplish-red, funnel-shaped flowers open above glossy green leaves edged in creamy white. The flowers have gently ruffled lobes, creating a colourful contrast against the pale leaf margins. Unlike many spring-flowering azaleas, 'Silver Sword' remains decorative long after its flowers have faded, thanks to its evergreen variegation.

Naturally compact, bushy and wider-spreading with age, this cultivar is particularly useful for smaller gardens, woodland-edge planting and sheltered patio containers. Its pale-edged leaves brighten partially shaded positions throughout the year, while the spring flowers provide a stronger burst of seasonal colour. Planted alongside ferns, pieris or other acid-loving shrubs, it brings a different foliage pattern to the planting without requiring the space of a large rhododendron.

Why We Love It

• Unusual evergreen variegation: Creamy-white leaf margins give this azalea a lighter appearance throughout the year, even outside its flowering season.

• Richly coloured spring blooms: Open, ruffled flowers in deep pinkish-red tones create a vivid display against the variegated leaves.

• Compact garden proportions: Its relatively low, well-branched growth suits smaller borders and carefully positioned containers.

• Two distinct seasons of interest: Spring flowering is followed by attractive foliage, which may develop reddish or bronze tones during colder weather.

• Excellent woodland companion: Works particularly well with other acid-loving plants that enjoy moist, humus-rich soil and filtered sunlight.

Plant Details

Attribute	Information
Botanical Name	Rhododendron 'Silver Sword'
Common Name	Silver Sword Evergreen Azalea, Japanese Azalea
Plant Type	Compact evergreen flowering shrub
Foliage	Glossy green, narrow oval leaves with irregular creamy-white margins
Flowers	Single, openly funnel-shaped, ruffled, deep pinkish-red to purplish-red
Flowering Period	Spring, generally April to May
Seasonal Interest	Spring flowers and year-round variegated foliage
Growth Habit	Dense, bushy, broadly rounded and spreading
Position	Partial shade or filtered sunlight
Soil	Acidic, humus-rich, moisture-retentive but well-drained
Mature Height	Approximately 60–90cm
Mature Spread	Approximately 75–100cm, potentially wider with age
Hardiness	Cold-hardy evergreen azalea; approximately −18°C under suitable conditions, with exposure and winter conditions affecting performance
Pruning	Light pruning immediately after flowering, if needed

Growing Guide

Position

Choose a position in partial shade or gentle filtered sunlight. Morning sun followed by afternoon shade is particularly suitable, allowing the plant to flower well without exposing the foliage to prolonged intense sunshine.

Avoid hot, exposed south-facing positions where the leaves and shallow roots may dry out. A sheltered east-facing border, woodland edge or position beneath the light canopy of taller shrubs can provide favourable conditions.

Allow sufficient space for the plant to spread naturally as it matures.

Watering

Water thoroughly after planting and maintain evenly moist soil while the roots establish. Azaleas have relatively shallow root systems, making them sensitive to prolonged drying during their first growing season.

Once established, water during extended dry spells, particularly in spring and summer when flower buds and new growth are developing.

For container-grown plants, check the compost regularly during warm or windy weather. Water when the upper layer begins to dry, allowing excess moisture to drain freely.

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

Soil and Compost

'Silver Sword' grows best in acidic, humus-rich soil that retains moisture without becoming waterlogged. A soil pH of approximately 4.5–6 is suitable for healthy azalea growth.

In garden borders, incorporate leaf mould or well-rotted organic matter where appropriate to improve soil structure and moisture retention.

Avoid strongly alkaline or chalky soils, which can interfere with nutrient uptake and cause yellowing foliage.

For containers, use a quality peat-free ericaceous compost in a pot with adequate drainage holes. Maintain a layer of suitable organic mulch around the roots, keeping it clear of the main stems.

Hardiness and Winter Care

'Silver Sword' is a cold-hardy evergreen azalea, with cultivar records indicating tolerance of approximately −18°C under suitable conditions.

In Irish gardens, winter success depends not only on minimum temperature but also on drainage, exposure and protection from drying winds. A sheltered position is beneficial, particularly during prolonged cold spells.

Evergreen leaves may develop bronze or reddish tones during winter. Some leaf damage can occur in exposed conditions, especially where frozen roots cannot replace moisture lost through the foliage.

Container-grown plants benefit from additional root protection during severe frost. Move pots to a sheltered location when necessary and avoid allowing compost to remain saturated throughout winter.

Routine Care and Pruning

Little pruning is normally required because 'Silver Sword' develops a naturally dense, rounded habit.

If shaping is needed, prune lightly immediately after flowering, removing damaged shoots or shortening stems that extend beyond the desired outline.

Avoid pruning late in summer or autumn, as this may remove developing flower buds for the following spring.

Remove faded flowers carefully if desired, taking care not to damage emerging growth beneath them.

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

Maintaining Variegated Foliage

Occasionally, variegated shrubs can produce shoots with entirely green leaves. If these appear, remove them at their point of origin to preserve the characteristic creamy-white leaf margins.

Avoid excessive feeding or heavily shaded conditions, which may encourage softer growth and reduce the visual impact of the variegation.

Perfect For

• Woodland-style gardens: The pale-edged foliage contrasts beautifully with ferns and other plants that enjoy filtered light and acidic soil.

• Shaded border fronts: Its relatively low, spreading habit provides evergreen coverage beneath taller shrubs.

• Patio containers: Offers spring flowers and year-round foliage in ericaceous compost, with suitable watering and winter protection.

• Small gardens and courtyards: Brings the character of a flowering rhododendron into a more manageable space.

• Acid-loving planting schemes: Combines well with pieris, heathers and compact rhododendrons where soil conditions are suitable.

Good to Know

'Silver Sword' is especially valued for its variegated foliage, which distinguishes it from many other evergreen azaleas. Its flowers are typically rich pinkish-red to purplish-red rather than the pale pink or white sometimes associated with variegated varieties.

Although compact, it is naturally a broad, spreading shrub rather than a permanently tight mound. Allow space for its eventual width and avoid heavy pruning into old wood.

The plant requires acidic growing conditions. Where garden soil is strongly alkaline, growing it in a suitable container with ericaceous compost is generally more practical than attempting to alter the pH of a large planting area.

Product Information

• Product: Rhododendron 'Silver Sword'

• Cultivar: 'Silver Sword'

• Plant Group: Evergreen Japanese Azalea

• Pot Size: 11cm (P11)

• Supplied Format: Potted evergreen shrub

• Product Barcode / SKU: 8713469691147