• Evergreen
    Leaves 5-10cm (2-4in) long, densely scaly below
  • Cream
  • White
  • Height
    3m (10ft)
  • Spread
    2m (6½ft)
  • Tall Shrub
    Funnel-shaped flowers are carried in trusses of 3 or 4
  • Half hardy - unheated greenhouse / mild winter
    Hardy in coastal and relatively mild parts of the UK except in severe winters and a risk from sudden (early) frosts. May be hardy elsewhere with wall shelter or good micro-climate. Likely to be damaged or killed in cold winters. Plant can withstand temperatures down to -5°C (23°F)

RHODODENDRON johnstoneanum

 

 

  • Additional Features
    Burncoose speciality
    See Burncoose Speciality group for more details
    Good to know
    Shallow planting is essential.
    Pests & Diseases
    Vine weevils, scale insects, honey fungus, powdery mildew, bud blast.
    Place of origin
    India. Named for George Johnstone, Trewithen, Truro, Cornwall
  • Burncoose Specialities
    Rhododendrons
  • Core Plants
    Rhododendron
  • Garden Location/Conditions
    Greenhouse / conservatory
    Not the sort of plants to be grown outside where there are likely to be frosts. These plants need to be grown in a conservatory or cool greenhouse or at least brought inside for the winter
    Shade from hot sun
  • Hardiness
    Frost hardy (down to -5)
  • Leaf margin
    Entire
    (see photos above)
  • Leaf shape
    Elliptic
    (see photos above)
    Obovate
    (see photos above)
  • Pruning group
    Pruning group 5
    Suitable for: Evergreen shrubs that require minimal pruning.
    Action: Trim or lightly cut back shoots that spoil symmetry. Deadhead regularly.
    When: Annually after flowering.

  • Scented Plants
    Scented flowers
    Scented Rhododendrons
  • Seasonal Interest
    Spring
  • Soil Conditions
    Acid / ericaceous loving
    Ideally pH 4.5-6.0
    Fertile moist well-drained soil
    Humus-rich
    Neutral to acid soil
  • Toxic - Category C
    Harmful if eaten
    (People & Pets)
  • Wildlife
    Rabbit Resistant
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Cold weather damage to evergreen plants
Rhododendron - Care Guide
Rhododendron - Propagation
Rhododendron - 'The Smellies'
Rhododendron - Video Spotlights
Shrubs and Trees - Seeds - 1) Collecting Seeds
Shrubs and Trees - Seeds - 2) Storing Seeds
Shrubs and Trees - Seeds - 3) Planting Seeds
3m (10ft)
Tall Shrub - guide for size not form Average Person
  2m (6½ft)
 

Useful extras...

Fertilisers & Feeds - Levington
Sulphate of Iron
Boosts soil acidity. Feeds ericaceous plants and helps prevent moss. Corrects leaf yellowing caused by iron deficiency. Easy to use, low dust granules
Only £11.00

Fertilisers & Feeds - Vitax
Q4 Pelleted Fertiliser
A useful fertiliser suitable for use on a wide variety of plants. Q4 provides all the nutrients and trace elements essential for vigorous growth, abundant flowering and ripening of fruit.
3 options from £6.00

Fertilisers & Feeds - Empathy
Afterplant - Grow Your Own
AFTER PLANT GROW YOUR OWN seaweed is ready to use liquid concentrate that was specially formulated be used on all edible plants.
Only £8.00

Fertilisers & Feeds - Empathy
Afterplant - Tomatoes
AFTER PLANT TOMATO FEED Liquid Concentrate with Bio stimulant is a high potash liquid concentrate containing seaweed extract, plant derived amino acids and other nutrients specifically formulated to benefit tomatoes and greenhouse plants.
Only £8.00

Fertilisers & Feeds - Empathy
Rootgrow mycorrhizal fungi
Recommended by the RHS. Contains Rootgrow™ mycorrhizal fungi. Suitable for all trees and shrubs (except rhododendrons, azaleas, heathers, cranberries and blueberries)
3 options from £3.00

Fertilisers & Feeds - Empathy
Rootgrow Ericoid mycorrhizal fungi
This specially adapted Rootgrow™ mycorrhizal fungi will boost the growth of acid-loving plants like rhododendrons, azaleas, heathers and blueberries. It contains ericoid and arbuscular mycorrhizal fungi, which are found in poor acidic soils where ericaceous plants naturally grow.
Only £7.50

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