Evergreen

Rhododendron 'Vulcan'

Rhododendron 'Vulcan' is a mounding evergreen shrub with dark green leaves and clusters of red flowers in late spring. It reaches about 5 feet high and wide after ten years; some mature estimates extend to about 8 feet high and 10 feet wide. Give it room in a shrub border or near a woodland edge where its foliage remains visible throughout the year. In Southwest Washington, choose a site with sun to partial shade, preferably with filtered afternoon light. Acidic, moist, well-drained soil and regular watering during dry weather support growth. The flowers can attract bees and hummingbirds.

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At a glance

Mature height: About 5 ft at ten years; may reach 8 ft
Mature spread: About 5 ft at ten years; may reach 10 ft
Light: Sun to partial shade
Hardiness: To about −10°F

The right plant, the right place

Make room for something good.

The mounding form and dark evergreen leaves give this shrub a year-round presence in a border. Red flower clusters provide a late-spring focal point.

Where to plant

Allow generous room around the shrub because mature spread may exceed its ten-year size. A position with filtered afternoon light is suitable.

Through the seasons

Red flowers appear in mid-to-late spring. Dark green leaves remain through the year.

Southwest Washington gardens

Give it a good start.

This cultivar is listed for maritime Northwest gardens. In Southwest Washington, avoid damp, crowded positions with poor air movement, which have been associated with more severe rust.

Soil, drainage & water

Plant in acidic, moist, well-drained soil. Water regularly during dry spells.

A little care goes a long way

Growing well, season after season.

Water regularly during dry weather, keeping the soil moist and well drained. Check foliage for lace bugs, particularly where the shrub receives more sun.

Know what to look for