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Rhododendron (x) impeditum Ramapo

Rhododendron x impeditum Ramapo
Impeditum Rhododendron, Dwarf Purple Rhododendron

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This Rhododendron forms a low bush with a rounded and wide habit. Its evergreen leaves are greyish-green and slightly shiny. They provide an ideal backdrop to showcase its magnificent lavender to mauve-lilac flowering, which lasts for about three weeks between April and May. Well suited to border plantings, it can also be planted in a container to brighten up a terrace. Thriving in not-too-bright sunlight or partial shade, in acidic and slightly moist soil, this ericaceous plant is very cold-resistant.
Height at maturity
60 cm
Spread at maturity
1 m
Exposure
Partial shade
Hardiness
Hardy down to -23°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time February to April, September to November
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Flowering time May to June
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Description

Rhododendron impeditum 'Ramapo' is a compact bush adorned with evergreen leaves, shiny and grey-green with a bluish hue. This spring variety will surprise you with its superb flowering in shades of mauve to lavender. It thrives in the sun in cooler regions, or in partial shade. An acidic and moist soil is essential for successful cultivation. Forming a low and spreading bush, this graceful little rhododendron is perfect for small gardens. Very hardy, it can also be grown in a container to decorate a terrace.

Rhododendrons are plants from the Ericaceae family, which includes a hundred genera, many of which are widespread in our gardens. Heathers, Kalmia, Andromeda, Leucothoe, Oxydendrum or Gaultheria are precious in ornamental beds, while Arbutus and especially Blueberries delight us with their fruits. In the vast majority, these are plants that prefer soils devoid of limestone, with an acidic tendency and humid climates.

Resembling an Azalea in its foliage and flowering, Rhododendron impeditum 'Ramapo' forms a dense and spreading bush, 60cm (24in) high and 1m (3ft) wide at maturity. Its small evergreen leaves have a beautiful glossy appearance and range in colour from green to blue and grey. Elliptical in shape, they are slender and leathery, with a fairly prominent central vein.
During the months of April and May, this bush flowers in clusters of 3 to 6 flowers, sometimes more, in shades of lavender to pink-mauve. This magnificent display lasts for about 3 weeks. Very hardy down to around -24°C, this Rhododendron impeditum 'Ramapo' shows slow growth.

The 'Ramapo' Rhododendron will be ideal in a border, in a pot, or even as a standalone plant in a small garden. For planting in a container, choose a pot made of terracotta or "double skin" if it is a plastic model. This insulating layer of air will prevent the substrate from overheating in summer, which can be detrimental to the roots. Also, remember to water very regularly in this case, as container cultivation is more stressful than in open ground.
In beds, this miniature Rhododendron will occupy the foreground, in front of taller plants of the heath family, such as the beautiful Kalmias, or Mountain Laurels, with their beautiful dark green foliage and lovely small flowers in May-June. It will also thrive in the light shade of an Oxydendrum arboreum, whose summer flowering in long clusters of white bells and dazzling autumn foliage will provide a spectacle for much of the year. And to ensure flowers all year round, complete this picture with an Autumn Camellia like the magnificent Camellia sasanqua Yuletide, whose bright red flowers with yellow stamens will enchant you from November to January...

Rhododendron (x) impeditum Ramapo in pictures

Rhododendron (x) impeditum Ramapo (Flowering) Flowering

Plant habit

Height at maturity 60 cm
Spread at maturity 1 m
Habit Irregular, bushy
Growth rate slow

Flowering

Flower colour mauve
Flowering time May to June

Foliage

Foliage persistence Evergreen
Foliage colour green

Botanical data

Genus

Rhododendron

Species

x impeditum

Cultivar

Ramapo

Family

Ericaceae

Other common names

Impeditum Rhododendron, Dwarf Purple Rhododendron

Origin

Cultivar or hybrid

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Planting and care

Plant the 'Ramapo' Rhododendron impeditum in a sunny (in cooler areas) to partially shaded (in hotter areas) location, protected from cold and drying winds, in a moist, humus-rich and light soil with an acidic tendency (pH between 4.5 and 6). Like all plants of the heath family, it does not tolerate chalky soils or heavy soils saturated with water in winter. And like the majority of rhododendrons, it does not tolerate drought or heatwaves. If the soil remains moist in summer, this rhododendron can also tolerate exposure to non-burning sunlight.

Dig a hole three times larger than the pot. Soak the root ball in non-chalky water for fifteen minutes and plant the bush at the collar level, in a mixture consisting of leaf compost, gravel or volcanic rock, and loam. Water generously and keep the soil moist in summer. Rhododendrons have a shallow root system, therefore, they are sensitive to long periods of drought. That's why it is recommended to have a humus-rich soil and abundant watering during dry periods. Moreover, this root system is not very strong, which is why it is essential to lighten heavy soils with draining materials (gravel, volcanic rock, clay pellets) at planting. Apply a mulch of shredded pine bark around the base of the bush every spring to retain soil moisture and maintain an acidic pH.

Maintenance consists of removing faded flowers in summer and cutting out dead branches. Azaleas and Rhododendrons can sometimes be attacked by weevils that eat the edges of the leaves and rootlets, as well as the infamous "rhododendron beetle" which rarely causes significant damage. Effective biological solutions are available today against weevils. Yellowing of the leaves (chlorosis) in Rhododendron indicates poor iron assimilation from the soil and can lead to premature death of the plant. While limestone (from the soil or irrigation water) is often the cause, poorly drained soil or deeply planted root balls can also explain the phenomenon.

Planting period

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

Intended location

Suitable for Shaded rockery, Woodland edge
Type of use Border, Edge of border, Container
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Partial shade
Soil pH Acidic
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, rich 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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