Rhododendron degronianum

Yakushima Azalea

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Evergreen shrub native to Japan with fuzzy new growth and vibrant spring blooms. Requires acidic soil, partial shade, and cool conditions. Ideal for temperate gardens or conservatories.
yard Outdoor plants wb_sunny Shade / Half-shade pets Not pet-safe
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Plant Details

Common Name Yakushima Azalea
Family Ericaceae
Genus Rhododendron
Species Degronianum
Origin Japan (Yakushima), Korea
Blooming Spring flowers, typically April-May
Leaf Color Dark green with greyish fuzz on new growth
Sunlight Shade / Half-shade
Category Outdoor plants
Pet Friendly close No
yard

Care & Maintenance

terrain
Soil

Acidic peat-based mix (ericaceous), excellent drainage required

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Watering

Keep consistently moist but not waterlogged. Use rain or distilled water if tap is alkaline

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Sunlight & Care

Partial shade; protect from hot direct sun to prevent leaf scorch and bleaching

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Fertilization

Apply acid-loving plant fertilizer in spring after flowering, avoid high nitrogen

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Pruning

Light pruning immediately after flowering to remove spent blooms and shape

Pest Control Aphid Lace Bug 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 2 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° – 86°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
40% – 75%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
1500 – 10000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
20 – 80
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
water
Soil Moisture
45% – 65%
% 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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