Azalea mollis Viscosa
Azalea mollis Viscosa
Azalea mollis Viscosa
Rhododendron (Azalea) mollis Viscosa
Chinese Azalea, Soft Rhododendron
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Description
The Rhododendron or Viscose Azalea mollis is an upright, deciduous shrub that thrives in partial shade and acid soil. It is known for its delicate, deliciously fragrant white spring flowers, as well as its vibrant autumn colours. Its leaves are sticky on the underside, earning it the name 'Viscosa'. Too little known and too little used, deciduous Azaleas are very graceful plants growing in chalk-free soil, with a whole host of qualities, just waiting for a place in the garden or in a large pot on the terrace!
Rhododendron x knaphill 'Viscosa' is descended from the Rhododendron molle, which is the parent of most cultivated deciduous Azaleas. It belongs to the heath or Ericaceae family and is native to central and eastern China. This slow-growing shrub initially has a loose habit, but over time, its branches thicken, giving the plant an upright, bushy appearance. At maturity, this Azalea will reach about 1.50m (4 ft 11 in) in height and 1m (3 ft 4 in) in spread. Under optimal conditions, it can grow up to 2m (6 ft 7 in) by 1.20m (3 ft 11 in). It flowers in April-May, with the appearance of new leaves on the branches. The blooms resemble lilies and are arranged in terminal clusters. They are pure white, adorned with 5 long, pink, curved stamens. In the evening, they exude a spicy fragrance. The deciduous foliage consists of simple, oval-lanceolate leaves with smooth edges, arranged alternately on the branches. They vary from 5 to 10 cm (2 to 3.9 inches) in length and turn dark green in summer before changing to orange and bright red in October before falling. Azaleas and Rhododendrons have a shallow root system that always needs to be kept moist, but they also dislike waterlogged soil which would suffocate the roots.
Deciduous Chinese Azaleas have fewer requirements than evergreen, Japanese Azaleas: they are very hardy and tolerate sunny positions, and even dry soil on occasion, depending on the hybrids. However, they give their best in cool climates, with distinct winters, planted in humus-rich, fertile, lime-free soil. They are beautiful shrubs for borders, with an attractive, informal habit, blooming twice a year and the perfect accompaniment to Japanese maples, which also change colour with the seasons, as well as Japanese camellias, or their graceful, often fragrant, autumn-flowering cousins, the Camellia sasanqua hybrids. They can also be grown in a large, carefully chosen pot, in suitable soil, and watered with lime-free water. The undeniable beauty of deciduous Azaleas merits the changes needed to create the conditions they prefer.
Azalea mollis Viscosa in pictures
Plant habit
Flowering
Foliage
Botanical data
Rhododendron (Azalea)
mollis
Viscosa
Ericaceae
Chinese Azalea, Soft Rhododendron
Cultivar or hybrid
Other Chinese Azalea
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Planting and care
The Azalea mollis thrives in a sunny location, unlike the Japanese Azalea, but its favourite position is in partial shade or east-facing for the morning sun, especially in very hot and sunny regions. Plant it in ericaceous or humus-rich, well-drained, lime-free soil. Make sure not to plant the root ball too deep, it should be level with the surface of the soil. Water copiously with alkaline-free water during dry periods, at least once a week in the first year. In spring, apply a fertilizer for ericaceous plants. Pruning is not essential but it is a good idea to prune lightly after flowering to keep the plant looking neat. Remove spent flowers to encourage new growth. The Azalea suffers from very few diseases when well-established outdoors. It can be attacked by weevils that eat the edges of the leaves and rootlets, and by the famous "Rhododendron lace bug", though not often causing significant damage. If the soil is chalky or poorly drained, or if the root ball is too deep, the leaves may turn yellow and eventually die.
Some cultivars are quite susceptible to powdery mildew.
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Planting period
Intended location
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Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
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