GardenWizzPlant Care Card

Rhododendron edgeworthii

Rhododendron edgeworthii · Shrub

Hardiness

H3 Half-hardy (to −5 to 1°C)

Position

Partial shade

Height × Spread

— × —

Soil

—

Flowering

April–May

Toxicity

All parts are harmful if eaten (grayanotoxins); also toxic to pets and livestock, and honey from the flowers can be toxic. (RHS: harmful if eaten.)

The Gardening Year

🌸 In flower

Watch out for

Chlorosis: Switch to rainwater, treat with chelated iron, and repot container plants into fresh ericaceous compost; mulch with acidic organic matter.

Bud blast: Remove and destroy affected buds; improve growing conditions; consider a suitable fungicide if the problem persists.

Powdery mildew: Improve air circulation, avoid overhead watering, and apply a suitable fungicide if the attack is severe.

Phytophthora root rot: Improve drainage, avoid deep planting, and remove and destroy severely affected plants; do not replant susceptible species in the same spot.

Aphids: Encourage natural predators; treat with insecticidal soap if needed; rarely kills established plants.