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RHODODENDRON 'J.C. Williams'
RHODODENDRON HYBRIDS
Good purplish-blue form of R. impeditum. Extremely floriferous and grows to 6 feet
Plant Details
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Floweringlocal_floristJanlocal_floristFeblocal_floristMarlocal_floristAprlocal_floristMaylocal_floristJunlocal_floristJullocal_floristAuglocal_floristSeplocal_floristOctlocal_floristNovlocal_floristDec
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Burncoose specialitySee Burncoose Speciality group for more details
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Pests & DiseasesVine weevils, scale insects, honey fungus, powdery mildew, bud blast.
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Place of originGarden origin. UK. 1988. Williams, Caerhays Estate, Cornwall
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Caerhays bred plants
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Rhododendrons
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Rhododendron
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Evergreen
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Blue
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PurpleShades of purple/mauve/lilac/violetPurple / blue
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Fully hardy
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Height2m (6½ft)
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Spread2m (6½ft)
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Medium shrubTypically grow to around 4-6 feet in height
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Hardy - cold winterHardy in most places throughout the UK even in severe winters. May not withstand open/exposed sites or central/northern locations. Plant can withstand temperatures down to -15°C (5°F)
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Spring Seasonal Interest
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harmful if eatenPeople and pets, i.e. cats, dogs, rabbits, rodents, tortoises
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Rabbit Resistant
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Mature Size2m (6½ft)
2m (6½ft)
Planting Tips and Care Advice
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Pruning group
Pruning group 5Suitable for: Evergreen shrubs that require minimal pruning.
Action: Trim or lightly cut back shoots that spoil symmetry. Deadhead regularly.
When: Annually after flowering.
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Soil Conditions
Fertile moist well-drained soilHumus-richNeutral to acid soilIdeally pH 4.5-6.0
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Sun Requirements
Full sunShelter from strong windsPartial shade
Cold weather damage to evergreen plants
Rhododendron - Care Guide
- Dead Heading
- Dead Heading - Video Tip ondemand_video
- Pruning
- Pruning - Video Tip ondemand_video
- Dwarf Rhododendrons for smaller spaces - Video Tip ondemand_video
- Weed Killing
- Pests and Diseases
- Drought issues - Video Tip ondemand_video
- Honey Fungus - Video Tip ondemand_video
- Maintenance - fallen tree - Video Tip ondemand_video
- General Pictures
- Further Reading
- Planting out rhodies - Video Tip ondemand_video
Rhododendron - Propagation
- Growing from seed
- Rhododendron Seed Collecting - Video Tip ondemand_video
- Potting on Rhododendron seedlings - Video Tip ondemand_video
- Propagation Program - Video Tip ondemand_video
- Growing from cuttings
- Propagation by taking semi-ripe cuttings - Video Tip ondemand_video
- Propagation by layering - Video Tip ondemand_video
- Propagation by other means
- Making a hybrid - Video Tip ondemand_video
- Making a hairy or scaly cross - Video Tip ondemand_video
- Caerhays bred 'Red Centurian'
Rhododendron - Video Spotlights
- R. augustinii, edgeworthii x leucaspis, 'Anne Teese', loderi 'King George' - Video Tip ondemand_video
- Rhododendron 'Cilpinense' - Video Tip ondemand_video
- Rhododendron decorum (pink form) - Video Tip ondemand_video
- Rhododendron genestrianum - Video Tip ondemand_video
- Five late flowering rhodies - Video Tip ondemand_video
- R. loderi 'King George' - Video Tip ondemand_video
- R. niveum - Video Tip ondemand_video
- R. 'Ostara' - Video Tip ondemand_video
- Rhododendron ‘Pink Polar Bear’ - Video Tip ondemand_video
- Scented Rhododendrons - Video Tip ondemand_video
Shrubs and Trees - Seeds - 1) Collecting Seeds
- When is the right time to collect seeds?
- When are seeds actually ripe and ready for collection?
- Magnolia seed collection - Video Tip ondemand_video
- Cornus capitata seed collection - Video Tip ondemand_video
- Lithocarpus Seed Collection - Video Tip ondemand_video
- Rhododendron seed collecting - Video Tip ondemand_video
- Camellia seed collection - Video Tip ondemand_video
Shrubs and Trees - Seeds - 2) Storing Seeds
Shrubs and Trees - Seeds - 3) Planting Seeds