Overview

Rhododendron sidereum 'Glen Rosa' is a bushy shrubs in the genus Rhododendron, part of the Ericaceae family, with evergreen foliage. Rhododendron sidereum 'Glen Rosa' grows best in partial shade, and tolerates loam soils and acid pH. Its UK hardiness is rated H5. Suggested uses include woodland gardens and containers on shaded patios.

About

Rhododendron sidereum 'Glen Rosa' is a bushy, evergreen cultivar of the Rhododendron genus, which includes both evergreen and deciduous shrubs or trees. This cultivar thrives in partial shade with an east- or west-facing aspect and prefers sheltered positions. It grows best in moist but well-drained, acidic loam soil. Suitable for woodland gardens and containers on shaded patios, 'Glen Rosa' is hardy to UK zone H5 and is best cultivated with mulch of leaf mould. Its season of interest includes both spring and winter.

Growing conditions

Best soil and position for Rhododendron

Sunlight
Partial shade
Soil type
Loam
Soil pH
Acid
Soil moisture
Moist but well-drained
Aspect
East-facing, West-facing
Exposure
Sheltered
UK hardiness
H5

Plant details

Rhododendron sidereum 'Glen Rosa' size, habit and characteristics

Plant type
Shrubs
Habit
Bushy
Foliage
Evergreen
Suggested uses
Woodland gardens, Containers on shaded patios

Care notes

Pruning and caring for Rhododendron sidereum 'Glen Rosa'

Propagation
Semi-ripe cuttings, Layering, Grafting
Pest resistance
Vine weevil, Rhododendron leafhopper, Pieris lacebug, Scale insects, Caterpillars, Aphids
Disease resistance
Powdery mildews, Rhododendron petal blight, Rhododendron bud blast, Silver leaf, Honey fungus

Frequently asked questions

Where is the best place to plant Rhododendron sidereum 'Glen Rosa'?

Rhododendron sidereum 'Glen Rosa' prefers partial shade. It suits sheltered positions.

What soil does Rhododendron sidereum 'Glen Rosa' need?

Rhododendron sidereum 'Glen Rosa' grows best in loam soil. It prefers acid soil. Aim for soil that stays moist but well-drained.

Is Rhododendron sidereum 'Glen Rosa' hardy in the UK?

Rhododendron sidereum 'Glen Rosa' has an RHS hardiness rating of H5, meaning it is hardy in most of the UK, tolerating -15 to -10°C.

How do I propagate Rhododendron sidereum 'Glen Rosa'?

Semi-ripe cuttings, Layering, Grafting.

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