Contents

Rhododendron Species, Dwarf Rhododendron

Category:

Shrubs

Height:

6-12 in. (15-30 cm)

Spacing:

12-15 in. (30-38 cm)

15-18 in. (38-45 cm)

18-24 in. (45-60 cm)

Hardiness:

USDA Zone 5b: to -26.1 °C (-15 °F)

USDA Zone 6a: to -23.3 °C (-10 °F)

USDA Zone 6b: to -20.5 °C (-5 °F)

USDA Zone 7a: to -17.7 °C (0 °F)

USDA Zone 7b: to -14.9 °C (5 °F)

USDA Zone 8a: to -12.2 °C (10 °F)

USDA Zone 8b: to -9.4 °C (15 °F)

USDA Zone 9a: to -6.6 °C (20 °F)

USDA Zone 9b: to -3.8 °C (25 °F)

Sun Exposure:

Full Sun

Danger:

All parts of plant are poisonous if ingested

Bloom Color:

Blue-Violet

Bloom Time:

Late Winter/Early Spring

Mid Spring

Foliage:

Evergreen

Shiny/Glossy

Other details:

Unknown – Tell us

Patent Information:

Non-patented

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Foliage Color:

Blue-Green

Bloom Characteristics:

Unknown – Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown – Tell us

Regional

This plant has been said to grow in the following regions:

Lexington, Kentucky

Watertown, New York

, Newfoundland and Labrador

Euclid, Ohio

Hilliard, Ohio

Oklahoma City, Oklahoma

Coos Bay, Oregon

Portland, Oregon

Dover, Pennsylvania

Sweetwater, Tennessee

Saint Albans, Vermont

Manchester, Washington

Sequim, Washington

Spokane, Washington

Woodinville, Washington

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Rhododendron ‘Album’ (Rhododendron ‘Album’)

Botanical name

Rhododendron ‘Album’

Other names

Rhododendron ‘Album’, Rhododendron impeditum ‘Album’, White cloudland rhododendron, Dwarf white rhododendron

Genus

Rhododendron Rhododendron

Variety or Cultivar

Native to

Garden origin

Foliage

Evergreen

Habit

Cushion or Mound Forming, Compact, Spreading

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Colour

Flower

Flushed pink, White in Spring

Dark-green in All seasons

How to care

Watch out for

Specific pests

Aphids , Caterpillars , Lacebugs , Leafhoppers , Vine weevil

Specific diseases

Powdery mildew , Rhododendron bud blast , Rhododendron petal blight , Silver leaf

General care

Pruning

Pruning group 8

Propagation methods

Grafting, Layering, Seed, Semi-hardwood cuttings

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Where to grow

Rhododendron ‘Album’ (Rhododendron ‘Album’) will reach a height of 0.8m and a spread of 1m after 10-20 years.

Suggested uses

Hedging/Screens, Cottage/Informal, City, Beds and borders

Cultivation

Thrives in moist, humus-rich, acid soil in partial shade. Will not tolerate deep planting. Do not allow to dry out. Protect from strong winter winds.

Soil type

Sandy, Loamy

Soil drainage

Moist but well-drained, Moisture-retentive

Soil pH

Acid

Light

Partial Shade

Aspect

North, South, East, West

Exposure

Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4)

USDA zones

Zone 9, Zone 8, Zone 7

Defra’s Risk register #1

Plant name

Rhododendron ‘Album’ (Rhododendron ‘Album’)

Common pest name

Ramorum leaf blight; Ramorum shoot dieback; Rhododendron twig blight; Sudden oak death

Scientific pest name

Phytophthora ramorum

Type

Oomycete

Current status in UK

Present (Limited)

Likelihood to spread in UK (1 is very low – 5 is very high)

Impact (1 is very low – 5 is very high)

General biosecurity comments

Pathogen of larch and other hosts subject to EU emergency legislation. A containment strategy is in place in the UK; reflecting its presence in wider environment/forestry settings in some areas. EU regulatory status is under review.

Defra’s Risk register #2

Rhododendron ‘Album’ (Rhododendron ‘Album’)

leaf rust of blueberry

Thekopsora minima

Fungus

Absent

Likelihood to spread to UK (1 is very low – 5 is very high)

Rust fungus affecting blueberry and hemlock. This fungus has been detected in Europe (Germany; Netherlands and Portugal). Some uncertainty about the suitability of UK native host species. But the case for regulation should be considered based on the EPPO PRA.

Defra’s Risk register #3

Rhododendron ‘Album’ (Rhododendron ‘Album’)

Elm spanworm; Ennomid; white; Linden moth; snow-white

Ennomos subsignaria

Insect

Absent

Polyphagous moth pest which defoliates deciduous trees and; with repeated infestation; can cause tree death. Present in North America and current import requirements do not fully mitigate the risk of introduction. A PRA will help to assess the level of risk more fully.

About this section

Our plants are under greater threat than ever before. There is increasing movement of plants and other material traded from an increasing variety of sources. This increases the chances of exotic pests arriving with imported goods and travellers, as well as by natural means. Shoot is working with Defra to help members to do their part in preventing the introduction and spread of invasive risks.

Traveling or importing plants? Please read “Don’t risk it” advice here

Suspected outbreak?

Date updated: 7th March 2019 For more information visit: https://planthealthportal.defra.gov.uk/

American Rhododendron Society Blog

In 1977 I purchased from a local nursery which was closing forty R. yakushimanum hybrids, 20 cm tall in pots at what seems now a ridiculous price of 40p each. These remained in pots until we moved to our present garden at Radlett in Hertfordshire in 1982 when they were planted out.

Among this collection were a group named the “Seven Dwarfs”, created by Percy Wiseman, the well-known hybridizer at Waterers Nursery. In the ensuing years, these plants have grown considerably and are not so dwarf anymore! The following descriptions are of interest to those starting a rhododendron collection in their garden.

‘Bashful’
Registered 1971. R. yakushimanum x ‘Doncaster’. Pale pink with a brown blotch. A very hardy plant, needs little attention and goes a long time without watering. Now measures 1.6 meter in height by 2.5 meter width.

‘Doc’
Registered 1972. Half yakushimanum and half unknown. Pink. Awarded the HC in 1978. This is a fine plant with magnificent blooms and superb compact habit. One of my favorites, blooming in late May. Now measures 1.5 meter in height by 2.3 meter width.

‘Dopey’
Registered 1971. Only a quarter yakushimanum with much other blood in its veins; facetum, dichroanthum and griersonianum. From its appearance one would think it had no yakushimanum in it at all. A deep rich red. Award of Merit 1977, FCC 1979. A favorite at Glendoick, I have read. While this is a fine plant, it suffers badly from mildew here in the South East in our long dry summers. Now measures 1.5 meter in height by 2.5 meter width.

‘Grumpy’
Half yakushimanum, half unknown. Award of Merit 1979. Peach fading to cream. This is the only true semi-dwarf plant of the group suitable for a rockery or border. It is prone to bark split caused by the late frosts after periods of warm weather here in Hertfordshire. It has fine foliage with brown indumentum, and has a superb hummock-shape with the excellent tight round yakushaimanum-type truss. Only two of the original four have survived. These now measure 1.0 meter in height by 2.5 meter width.

‘Hoppy’
Registered 1972. Half yakushimanum and quarter ‘Doncaster’ and quarter unknown. Award of Merit 1977. The name ‘Hoppy’ was used rather than ‘Happy’ as Rothschild registered a rhododendron of this name in 1940. This is also one of my favorite in flower opening pale lavender, fading to pure white. A wonderful sight in a woodland setting. This is “The Giant” dwarf which, in time, will grow into a plant of some size. Now measure 2.5 meter in height by 3 meter width.

‘Sleepy’
Registered 1971. Half yakushimanum, quarter unknown, quarter ‘Doncaster’. Pale mauve, spotted brown. This is the runt of the litter which I found very difficult to grow. Despite all my efforts, the leaves always showed signs of cholorsis, and the plants lacked any vitality and slowly died one by one probably due to our very dry summers. One plant, which I gave to a friend locally, survived but in a stunted, miserable condition. I have not seen this plant for sale in the nursery trade for some years which I think speaks for itself.

‘Sneezy’
Registered 1971. Half yakushimanum, quarter unknown, quarter ‘Doncaster’. This is an easy vigorous plant which layers very readily, with good dark green foliage but is not to my taste as it is a rather garish red/pink which fades badly in sunlight and does not sit easily with the surrounding plants in my collection. If you do try it, I suggest placing it amongst white flowering varieties. Now measures 1.7 meter in height by 2.8 meter width.

Amongst the others in the original collection were: ‘Venetian Chimes’, ‘Percy Wiseman’, ‘Golden Torch’, and ‘Chelsea Seventy’. The first three have proved to be excellent garden plants, very hardy, keeping their semi-miniature stature. They are beautifully compact in habit, and will fit in every well with smaller garden schemes. ‘Chelsea Seventy’ while having a startling flower with strong dichroanthum influence has a leggy habit with not particularly inspiring foliage.

Rhododendron ‘PURPLE PILLOW’

Purple Pillow is a fantastic, dwarf variety of rhododendron. It makes profusion of lilac-pink to purple-violet small flowers in April and May. Once in full bloom the shrub is totally covered with flowers for 2-3 weeks. It often makes some flowers in early autumn again. Its evergreen leaves are dark green, narrowly elliptic.
Purple Pillow grows very slowly into a cushion-like shrub, some 60 cm tall and twice as wide 15 years. Being a sun-tolerant species it can be placed in a large rockery or a border with other sun-loving ericaceous plants like heather and deciduous azaleas. It is a perfect ground cover under tall trees and a low companion for compositions with large shrubs. Unless you are making a bonsai of it do not prune.
Grow this dwarf type in any location from full sun to full shade, just make sure it is always well mulched. The roots are shallow, spreading to sides in search for nutrients. Never plant it too deep. The soil has to be acidic (pH 4.5-5.5), rich in humus, cool and always moist. Ideal soil mixture is peat with lime-free, light garden soil topped with leaf mould. Fully hardy to approx. -27°C (USDA zone 5), possibly more.

Last update 20-01-2012

Rhododendron

Rhododendron Shrub

This family of plants contains an option for every landscape, from the giant rhododendrons of East Asian mountainsides to the rosebay rhododendrons native to Eastern U.S. woodlands. These often-broadleaf evergreen plants boast large clusters of showy blooms at their growing tips in spring. In areas where dry winters tend to desiccate evergreen types, deciduous varieties of rhododendrons can fill in the gap.

genus name
  • Rhododendron
light
  • Part Sun,
  • Shade
plant type
  • Shrub
height
  • 3 to 8 feet,
  • 8 to 20 feet
width
  • Up to 25 feet
flower color
  • Purple,
  • Red,
  • Orange,
  • White,
  • Pink,
  • Yellow
foliage color
  • Blue/Green
season features
  • Spring Bloom,
  • Fall Bloom,
  • Summer Bloom,
  • Winter Interest
problem solvers
  • Deer Resistant,
  • Good For Privacy
special features
  • Fragrance,
  • Good for Containers
zones
  • 3,
  • 4,
  • 5,
  • 6,
  • 7,
  • 8,
  • 9
propagation
  • Layering,
  • Seed,
  • Stem Cuttings

Colorful Combinations

A classic shade garden plant, rhododendrons are prized for their glossy green foliage and showy clusters of blooms. Coming in a wide variety of colors, the most common flowers are borne in ranges of purples and pinks into whites. Many of the deciduous types also boast bright yellow and orange hues that work wonders in brightening up shady corners of the garden.

Rhododendron Care Must-Knows

The rhododendron is a wonderful addition to any shade garden. Deciduous varieties can hold up much better to more sun, as many of the evergreen types can be susceptible to burn in winter where they are exposed. To prevent this, plant evergreen types in sheltered areas, avoiding southern exposures since warm and sunny winter days can be fatal. Keep them sheltered from drying winter winds as well. Evergreen types may begin to curl their leaves during the winter, and this is actually a physiological response to dry winter weather. By curling their leaves, they are protecting themselves from cold temperatures and winds in order to prevent potential winter burn.

Why your rhododendron’s leaves are curling.

Rhododendron plants, much like many other plants in the Ericaceae family, prefer acidic soils. Ideal soil pH for rhododendron plants is somewhere between 4.5 and 6.0. If you have had problems growing rhododendrons in the past, perform a soil test. You can amend the soils with peat moss, compost, and other soil acidifiers to keep them happy.

Rhododendron also appreciates organically rich soil. This will keep the shrubs decently moist and prevent them from drying out—dry winters and late falls can be particularly fatal to rhododendrons. On the other end of the spectrum, overly wet soils can also be fatal to rhododendrons. Finding the right balance of moisture in soils can be tricky.

Pruning may be necessary to create a more desirable shape and overall more visually appealing plant. After the plants have bloomed, spent blossoms can be cut back to the new growing tips. After bloom is also the ideal time to do any other pruning. Damaged or diseased growth should always be removed to prevent the spread of disease. You can also do rejuvenation pruning by cutting older plants back more severely to encourage better branching.

More Evergreen Shrub Varieties

Rhododendron or Azalea?

Rhododenrons and azaleas often get confused. A while back, azaleas were considered a separate genus of plants, but since they have been found very genetically similar to rhododendrons, today they are lumped in the same genus. Now, azalea has become more of a common name within certain types of rhododendrons. People tend to think of rhododendrons as larger evergreen plants with big clusters of blooms. “Azaleas” are what people tend to associate with deciduous rhododendrons, and generally have smaller leaves and shorter plant habits.

More Varieties for Rhododendron

Autumn Chiffon Encore azalea

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Rhododendron ‘Robled’ offers light pink flowers in spring, summer, and fall. It grows 3 feet tall and wide. Zones 7-9

Bloom-A-Thon® series rhododendron

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A series of semi-evergreen azaleas that feature a re-blooming habit for season long color. Zones 6-9

Blue Diamond rhododendron

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Rhododendron ‘Blue Diamond’ is a dwarf evergreen rhododendron that bears violet-blue flowers. It grows 5 feet tall and wide. Zones 7-9

Bollywood® rhododendron

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Beautiful cream variegated foliage sets this variety apart, with bright magenta flowers in the spring on dwarf plants that make great container plants. 2-3 feet tall and wide. Zones 6-9.

Capistrano rhododendron

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Rhododendron ‘Capistrano’ is a compact, mounding selection, growing to 4 feet tall and wide, bearing trusses of frilled greenish-yellow flowers. Zones 6-8

Cecile azalea

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Rhododendron ‘Cecile’ grows vigorously to become a dense, 7-foot-tall and 7-foot-wide shrub with trusses of large, salmon-pink flowers. Zones 5-8

Hydon Dawn rhododendron

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Rhododendron ‘Hydon Dawn’ is one of the few rhododendrons that tolerates full sun. It has a low, compact habit to 5 feet tall and wide and bears clusters of small, clear pink flowers that fade to white. Zones 7-9

Hiryu azalea

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Rhododendron obtusum amoenum is a dense, low-growing evergreen azalea that bears reddish-violet to crimson flowers. It grows 18 inches tall and 3 feet wide. Zones 6-9

‘Fielder’s White’ azalea

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Rhododendron ‘Fielder’s White’ is blanketed with single white blossoms in mid-spring. Evergreen foliage complements the 3-inch-wide flowers on this variety. Zones 8-9

Gibraltar hybrid azalea

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Rhododendron ‘Gibraltar’ grows vigorously to 5 feet tall and wide, bearing bright orange flowers. Can tolerate full sun. Zones 5-8

Karen azalea

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Rhododendron ‘Karen’ is a hardy evergreen azalea bearing purple flowers in spring. It grows 3 feet tall and wide. Zones 4-9

‘Mandarin Lights’ rhododendron

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A deciduous type azalea, it features bright orange blooms in spring on naked stems before the foliage emerges. 4-5 feet tall. Zones 3-7

‘Purple Dragon’ azalea

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Rhododendron ‘Purple Dragon’ features striking dark purple-red flowers that open at the branch tips in late spring. The shrub grows 3-4 feet tall and wide. Zones 7-9

Hino Crimson azalea

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Rhododendron ‘Hino Crimson’ is a dwarf, densely growing azalea that produces bright red flowers. It grows 2 feet tall and wide. Zones 5-8

Korean azalea

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Rhododendron yedoense poukhanense bears lilac to deep-rose funnel-shaped flowers in spring. In fall, leaves change to a gold or reddish purple. Grows 6 feet tall and wide. Zones 5-9

Nova Zembla rhododendron

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Rhododendron ‘Nova Zembla’ is a large evergreen shrub that bears trusses of deep red flowers with spotted throats. It grows 5 to 10 feet tall and wide. Zones 5-8

‘Nuccio’s Carnival’ azalea

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Rhododendron ‘Nuccio’s Carnival’ presents a profusion of large, single to semidouble magenta blossoms that add a burst of color to the landscape. Flowers are backed by rich green evergreen foliage. Zones 8-9

Olga Mezitt rhododendron

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Rhododendron ‘Olga Mezitt’ is an evergreen selection that produces small trusses of deep peach-pink flowers. The leaves redden in fall. It grows to 4 feet tall and wide. Zones 4-8

Rosy Lights azalea

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Rhododendron ‘Rosy Lights’ is a deciduous azalea that offers extra cold hardiness. The shrub grows to 4 feet tall and wide and features deep purple-pink flowers. Zones 3-8

‘Rose Queen’ azalea

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Sun Chariot rhododendron

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Rhododendron ‘Sun Chariot’ is an upright, dense-growing spring-blooming variety that grows 6 feet tall and wide. It bears yellow blooms with orange blotches in large clusters. Zones 6-9

Trude Webster rhododendron

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Rhododendron ‘Trude Webster’ forms a compact, upright plant with clustered, clear pink flowers. It grows 5 feet tall and wide. Zones 6-9

‘White Grandeur’ azalea

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Rhododendron ‘White Grandeur’ has long-lasting white flowers dotted with green speckles in mid-spring. This small evergreen cultivar grows 2-3 feet tall and wide.

Garden Plans For Rhododendron

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