Rhododendron Azalea Mary Helen, in 9cm Pot, White Blooms Growing Details: Common Name: Rhododendron Mary Helen Skill Level: Beginner Exposure: Full sun / Partial Shade Hardiness: Hardy Soil type: Well-drained/light, Acidic, Moist Height: 60cm Spread: 60cm Description: A spreading evergreen shrub with glossy green, small leaves and large, white flowers with a wavy margin up to 5cm across with a yellow spotting and dark anthers, produced in early June.