Evergreen

Rhododendron 'Edith Bosley'

Rhododendron 'Edith Bosley'

Rhododendron 'Edith Bosley' is an upright evergreen shrub with clusters of purple flowers marked darkly in late spring. Its foliage provides structure through the rest of the year, while the flowers provide a seasonal focus. Allow about 5 to 8 feet in both height and spread at maturity; this long-term size calls for generous space. In Southwest Washington, place it where partial shade and acidic, moist but well-drained soil are available. It suits a shrub border or a planting with enough room for its full width. Water during dry periods so the root area does not dry out.

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At a glance

Mature height
About 5–8 ft
Mature spread
About 5–8 ft
Light
Partial shade
Hardiness
USDA zones 4–9

The right plant, the right place

Make room for something good.

The upright evergreen habit gives shrub borders year-round structure. Late-spring purple flowers add a seasonal display.

Where to plant

Allow for a mature spread of about 5 to 8 feet. Choose a partially shaded position with room for that width.

Through the seasons

Dark-marked purple flowers appear in late spring. The foliage remains evergreen.

Southwest Washington gardens

Give it a good start.

This cultivar is suited to maritime Northwest gardens. In Southwest Washington, its partial-shade preference makes site selection important.

Soil, drainage & water

Plant in acidic, moist but well-drained soil. Keep it watered through dry periods without leaving the roots in poorly drained ground.

A little care goes a long way

Growing well, season after season.

Water during dry periods to keep the root area from drying out. Pruning is generally minimal.

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 leaves, wilting or branch dieback; roots may rot.

Help your plant thrive

Plant in well-drained soil and use disease-free plants. Remove infected plants.

Rhododendron lace bug

Pale stippling above the leaves and dark, crusty deposits underneath.

Help your plant thrive

Check leaf undersides. A strong stream of water can reduce the insects; partial shade may limit severe infestations.

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for your place.

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