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Rhododendron japonicum
filter_vintage Ericaceae Plants yard Outdoor plants

Rhododendron japonicum

Japanese Azalea / Rhododendron

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Evergreen shrub with spring blooms requiring acidic soil and cool roots. Native to Japan, it thrives in humidity but struggles indoors without precise climate control.
yard Outdoor plants wb_sunny Half-shade pets Not pet-safe
info Pot sizes shown are estimations. Real dimensions may vary depending on the merchant.
Merchant Pot Size Availability Price
Amazon.com - Out of Stock $27.99 Buy
Amazon.com - In Stock $32.99 Buy
Amazon.com - Out of Stock $61.49 Buy
Amazon.com - Out of Stock $64.49 Buy
Merchant Pot Size Availability Price
Amazon.com 7-8 in Out of Stock $15.97 Buy
Amazon.com 7-8 in In Stock $76.99 Buy
info

Plant Details

Common Name Japanese Azalea / Rhododendron
Family Ericaceae
Genus Rhododendron
Species Japonicum
Variety Common Cultivar
Origin East Asia
Blooming Spring, clusters of bell-shaped flowers
Leaf Color Dark glossy green
Sunlight Half-shade
Category Outdoor plants
Pet Friendly close No
yard

Care & Maintenance

terrain
Soil

Acidic peat mix with perlite and pine bark, pH 4.5-6.0 required for nutrient uptake

water_drop
Watering

Keep soil consistently moist but never waterlogged; use rainwater or distilled water to prevent lime buildup

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Sunlight & Care

Bright indirect light; direct sun may scorch leaves in summer heat indoors

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Fertilization

Apply acid-specific liquid fertilizer monthly during growing season (Spring to early Autumn)

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Pruning

Trim after flowering to maintain shape and remove deadwood

Pest Control Aphid Rhododendron Leafhopper Scale Insect Spider Mite

These are the insects and pathogens that commonly interact with this plant, including pests, parasites, and organisms typically associated with its care.

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Seasonal Periods

local_florist Flowering Period 3 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
eco Leaf Persistence 12 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
thermostat

Growing Parameters

thermostat
Temperature
41° – 79°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
50% – 85%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
4000 – 12000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
800 – 2500
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
water
Soil Moisture
40% – 70%
% volumetric
Water content in the growing medium
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Soil EC
300 – 1200
mS/cm
Electrical conductivity (nutrient concentration in soil water)
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Common Problems

Something wrong with your Rhododendron japonicum? Select a symptom to diagnose and fix the issue.

eco Yellow Leaves chevron_right
eco Brown Leaf Tips chevron_right
eco Drooping Leaves chevron_right
eco Sticky Leaves chevron_right
eco White Cottony Spots chevron_right
eco Tiny Black Flies chevron_right
eco Sudden Leaf Drop chevron_right
eco Fine Webbing chevron_right
eco White Powder chevron_right

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