Rhododendron racemosum

Tree Rhododendron

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An evergreen shrub from the Himalayas, prized for its red flowers and leathery leaves. Requires acidic soil and cool climates.
yard Outdoor plants wb_sunny Half-shade pets Not pet-safe
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Plant Details

Common Name Tree Rhododendron
Family Ericaceae
Genus Rhododendron
Species Racemosum
Variety N/A (Synonym of R. arboreum)
Origin Himalayas (Nepal/India)
Blooming Spring, vibrant red clusters
Leaf Color Dark green with pubescence underneath
Sunlight Half-shade
Category Outdoor plants
Pet Friendly close No
yard

Care & Maintenance

terrain
Soil

Acidic ericaceous mix (pH 4.5-6.0), rich in organic matter and well-draining

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Watering

Keep soil consistently moist but not waterlogged, use rainwater or soft water if possible

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Sunlight & Care

Bright indirect light or partial shade, avoid harsh midday sun especially indoors

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Fertilization

Feed with ericaceous fertilizer in spring during active growth phase only

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Pruning

Remove dead flowers and shape after flowering to maintain structure

Pest Control Aphid Rhododendron 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 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
45° – 82°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
50% – 90%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
1000 – 15000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
300 – 1200
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
water
Soil Moisture
35% – 65%
% volumetric
Water content in the growing medium
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Soil EC
400 – 1200
mS/cm
Electrical conductivity (nutrient concentration in soil water)

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