Rhododendron ‘Blue Danube’

evergreen azalea

  • © Richie Steffen / Geat Plant Picks

Outstanding Qualities

This vigorous selection of evergreen azalea becomes covered with flowers in late April to early May. The large, intensely colored hot magenta flowers glow with a deeper purple red throat adding a sense of depth to the bloom. This old Belgium cultivar has a vigorous growth habit becoming an attractively tiered shrub as it matures.

Quick Facts

Plant Type: shrub

Foliage Type: evergreen

Plant Height: 4 ft. 0 in. (1.22 meters)

Plant Width/Spread: 5 ft. 0 in. (1.52 meters)

Plant Height-Mature: 4 ft. 0 in. (1.22 meters)

Plant Width-Mature: 5 ft. 0 in. (1.52 meters)

Hardiness: USDA Zones 5 to 9

Flower Color: purple

Sun/Light Exposure: full sun to light or open shade

Water Requirements: regular watering

Seasonal Interest: hot magenta colored flowers in spring

Wildlife Associations: bees, hummingbirds

Colors & Combos

Great Plant Combinations: Plant it under spring flowering cherries or dogwoods. The bold silver foliage of Brunnera macrophylla 'Jack Frost' or the silver spotted leaves of pulmonaria would look great with the flowers and foliage of this azalea. Create a spring wonderland by combining with ferns, epimediums, primrose, or wood anemone (Anemone nemorosa).

Great Color Contrasts: cream, silver, gold

Great Color Partners: bronze, dark green, chartreuse

Culture Notes
This azalea is easy to grow in the Pacific Northwest. Plant it in rich well-drained or sandy soil in a location with full sun to light or open shade. Azaleas are shallow-rooted plants requiring regular watering during dry weather. Faded flowers often drop off or are quickly covered by new growth. Almost no pruning is needed to keep azaleas looking good. Adult root weevils can chew on their leaves, but this is less of a problem on plants that receive more light and regular watering.