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Evergreen

English Roseum rhododendron

Rhododendron 'English Roseum'

Rhododendron 'English Roseum' forms a dense, rounded evergreen shrub with dark green leaves and clusters of pale lilac-pink flowers in late spring or early summer. Its eventual size can vary: allow for about 4–10 feet of height and 5–11 feet of spread, rather than treating a young plant's footprint as permanent. In Southwest Washington, place it where partial shade and enough room for its broad form suit a woodland garden, border, hedge, or screen. Give its roots acidic, moist but well-drained soil, and keep the soil from drying out in summer. Its persistent foliage gives the planting structure through winter.

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At a glance

Mature height
About 4–10 feet
Mature spread
About 5–11 feet
Light
Partial shade
Hardiness
Generally USDA zones 4–8

The right plant, the right place

Make room for something good.

The dense, rounded form can fill a woodland border or serve as a hedge or screen. Its dark evergreen foliage remains after the flowers fade.

Where to plant

Choose partial shade and leave room for a spread of about 5–11 feet. Allow enough space from paths and nearby plants for its mature form.

Through the seasons

Pale lilac-pink to rose-lilac clusters flower in late spring to early summer. Dark green leaves remain through winter.

Southwest Washington gardens

Give it a good start.

In Southwest Washington, give this shrub a site that drains well during wet weather. Check soil moisture during dry summer periods.

Soil, drainage & water

Plant in acidic, moist but well-drained soil. Maintain moisture while allowing excess water to drain away.

A little care goes a long way

Growing well, season after season.

Keep the soil moist through summer without letting it become waterlogged. Check moisture during dry spells and water before the soil dries out.

Know what to look for

Common growing concerns.

Symptoms can have more than one cause. These notes are a starting point for observing your plant and improving its growing conditions.

Phytophthora root rot

Stunted growth, yellowish-green leaves, wilting, branch dieback, or rotting roots.

Help your plant thrive

Plant in well-drained soil and start with disease-free plants. Remove and destroy infected plants and debris.

Rhododendron lace bug

Pale stippling on leaf tops and dark, crusty deposits underneath; repeated infestations can yellow the foliage.

Help your plant thrive

Check leaf undersides for insects. Remove them by hand or with a strong stream of water.

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