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Rhododendron Rocket

Rhododendron Rocket
Rhododendron

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This bushy rhododendron, reaching a height of 1.50 m (5 ft) and a width of 1.20 m (4 ft), has beautiful evergreen shiny green foliage and is covered with clusters of shimmering pink flowers in spring, and sometimes also in autumn. Decorative throughout the year, this hardy bush can be grown both in the ground and in pots, in acidic soil, in partial shade or even in the morning sun if the soil remains consistently moist.
Flower size
5 cm
Height at maturity
1.50 m
Spread at maturity
1.20 m
Exposure
Partial shade, Shade
Hardiness
Hardy down to -20°C
Soil moisture
Moist soil
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Best planting time March to April
Recommended planting time February to May, September to October
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Flowering time May
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Description

Rhododendron 'Rocket' is an old bush with bright pink flowers that is widely planted in gardens, as well as in large pots to adorn terraces and balconies. Naturally compact and vigorous, this medium-sized bush is covered with beautiful evergreen foliage of a glossy bronze-green colour. It blooms abundantly in spring, and sometimes again in autumn depending on the climate. Its large frilly flowers of vibrant pink will bring life to shaded areas from the first warm days. 'Rhodos', as spectacular as they are exclusive, only thrive in acidic, rich, moist but well-drained soil. 

  

Rhododendrons are plants of the Ericaceae family, just like heathers, preferring for the most part soils devoid of limestone, tending to be acidic, and humid climates. Derived from the hybridization of the variety 'Cunningham's White' and a red R. catawbiense seedling, Rhododendron 'Rocket' remains to this day one of the most popular cultivars. It forms a dense bush with a rounded habit, reaching approximately 1.50 m (5 ft) in height and 1.20 m (4 ft) in width at maturity. Its growth is rather slow, generally reaching 1.20 m (4 ft) in height at the age of 10. Its large evergreen leaves are elliptical in shape and cover the plant well. They are glossy bronze-green on the upper side and show a lighter and fuzzy underside. In May, for about 3 weeks, a remarkably abundant flowering submerges the bush: grouped in large, rounded corymbs of 9 units, beautiful large funnel-shaped flowers in bud red-pink open to pure and vibrant pink, with a deeper hue on the edges and a lighter shade in the throat. The petals of 'Rocket' are highly frilly on the edges, opening to long pink stamens. 

  

Rhododendron 'Rocket' is a flowering plant and quite hardy, down to -15°C or even -20°C. Although they prefer partial shade, hybrid Rhododendrons can tolerate morning sun as long as it is not scorching and their base remains moist. "Rocket", with its abundant and vibrant flowering, will easily adorn a small shaded space in the garden, alongside ferns, hostas, Pieris, heathers, Kalmias, Azaleas, Japanese Maples, or other rhododendrons from the same group to create stunning patchworks of textures and colours in spring. Large rhododendrons can be used to create magnificent hedges, alone or with camellias or mimosa (in mild climates). Cultivating in pots requires regular watering with lime-free water and specific fertilizers for acid-loving plants. 

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Rhododendron Rocket in pictures

Rhododendron Rocket (Flowering) Flowering
Rhododendron Rocket (Foliage) Foliage

Plant habit

Height at maturity 1.50 m
Spread at maturity 1.20 m
Habit Irregular, bushy
Growth rate slow

Flowering

Flower colour pink
Flowering time May
Inflorescence Corymb
Flower size 5 cm
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Evergreen
Foliage colour green

Botanical data

Genus

Rhododendron

Cultivar

Rocket

Family

Ericaceae

Other common names

Rhododendron

Origin

Cultivar or hybrid

Product reference842691

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Planting and care

Plant the 'Rocket' Rhododendron in a semi-shaded or even shaded position, protected from cold and drying winds, in a moist, humus-rich and light soil, with a tendency towards acidity or neutrality. Like all heathland plants, it does not tolerate chalky soils or heavy soils saturated with water in winter. If the soil remains moist in summer, this rhododendron can also tolerate morning sun exposure. Avoid planting at its base, as its shallow roots do not tolerate competition from other plants, especially for water resources. 

Dig a hole three times larger than the pot. Soak the root ball in lime-free water and plant the bush at the collar level, in a mixture composed of leaf compost, gravel or pumice, and loam. Water thoroughly and keep the soil moist in the summer. Azaleas and Rhododendrons have a shallow root system. As a result, they are susceptible to long periods of drought. That's why humus-rich soil and abundant watering during dry periods are recommended. In addition, this root system is not very strong, so it is essential to lighten heavy soils with draining materials (gravel, pumice, clay balls) at planting. Apply a layer of shredded pine bark mulch at the base of the bush every spring to maintain soil moisture while keeping an acidic pH. 

Maintenance consists of removing faded flowers in summer and removing dead branches. Azaleas and Rhododendrons can sometimes be attacked by weevils that eat the edges of leaves and rootlets, as well as the infamous "rhododendron beetle" which does not often cause severe damage. Effective biological solutions exist today against weevils. Yellowing of the leaves (chlorosis) in Rhododendrons indicates poor assimilation of iron from the soil and can lead to premature death of the plant. While limestone is often the cause, poorly drained soil or deeply planted root balls can also explain the phenomenon. 

"Rhodos" thrive in cooler climates, planted in limestone-free soil and in a humid environment. Their cultivation in our hotter and drier climates is often doomed to failure in the long run, despite all the efforts to acclimate them. 

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Planting period

Best planting time March to April
Recommended planting time February to May, September to October

Intended location

Suitable for Woodland edge, Undergrowth
Type of use Border, Container, Hedge
Hardiness Hardy down to -20°C (USDA zone 6b) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Partial shade, Shade
Soil pH Acidic
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, Humus-rich or peaty, or even sandy, fertile and well-drained

Care

Pruning No pruning necessary
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground
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