GardenWizzPlant Care Card

Rhododendron Racemosum

Rhododendron racemosum · Shrub

Hardiness
H6 Hardy — very cold winter (to −20 to −15°C)
Position
Partial shade
Height × Spread
1.5–2.5 m × 100–150 cm
Soil
moist but well-drained, leafy, humus-rich acid soil
Flowering
March–May
Toxicity
Harmful if eaten. Wear gloves and other protective equipment when handling. Harmful to pets (dogs, cats, rabbits and tortoises) if eaten.

The Gardening Year

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🪴 Plant out
🌸 In flower

Watch out for

Vine weevil: Apply nematodes to moist soil in autumn or use a systemic insecticide for severe infestations.

Rhododendron budworm: Prune out affected shoots or apply a biological insecticide like spinosad when larvae emerge.

Powdery mildew: Improve air circulation and spray with a fungicide containing myclobutanil if severe.

Phytophthora root rot: Ensure well-drained acid soil and avoid overwatering; remove severely infected plants.

Pieris lacebug: Spray with a horticultural oil or insecticidal soap during early summer outbreaks.

Full guide: gardenwizz.com/plants/rhododendron-racemosum © GardenWizz — UK gardening encyclopedia