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PlantSnap
Plant Care
Japanese azalea
(Rhododendron japonicum)
Also Known As
Japanese azalea, Japanese rhododendron, Japan azalea
About This Plant
Rhododendron japonicum is an evergreen shrub that produces clusters of pink flowers in the spring. The leaves are dark green and glossy, with a leathery texture. This plant species is native to Japan and is widely cultivated for its ornamental value.
Plant Care Instructions
Outdoor Size Range
6-10 feet (1.8-3 meters)
Light Requirements
Rhododendron japonicum prefers partial shade to full sun. It can tolerate some shade but will not flower as well.
Humidity Needs
This plant species prefers high humidity levels. Mist the leaves regularly or place a tray of water nearby to increase humidity.
Fertilizing Schedule
Fertilize in the spring with a slow-release, acid-forming fertilizer. Avoid fertilizing in the fall, as this can stimulate new growth that may be damaged by winter frost.
Pruning Guidelines
Prune after flowering to shape the plant and remove any dead or diseased wood. Avoid heavy pruning, as this can reduce flowering the following year.
Common Pests and Diseases
Common pests include aphids, spider mites, and scale insects. Diseases such as powdery mildew and root rot can also affect this plant species.
Indoor Size Range
36-48 inches (91-122 cm)
Watering Schedule
Water regularly during the growing season, keeping the soil moist but not waterlogged. Reduce watering in the winter months.
Temperature Range
Rhododendron japonicum prefers cool temperatures between 60-70°F (15-21°C). It can tolerate slightly higher temperatures but may suffer in extreme heat.
Growing Season
The growing season for Rhododendron japonicum is from spring to fall.
Growing Difficulty Level
Rhododendron japonicum is moderately difficult to grow. It requires specific soil conditions and can be susceptible to pests and diseases.
USDA Hardiness Zones
Rhododendron japonicum is hardy in USDA zones 6-9.
Did You Know?
Rhododendron japonicum is the official flower of Tokyo, Japan.
