Rhododendron calendulaceum

Flame Azalea

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Deciduous shrub native to the SE USA, known for fiery orange-red blooms in spring. Requires acidic soil and cool roots.
yard Outdoor plants wb_sunny Half-shade pets Not pet-safe
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Plant Details

Common Name Flame Azalea
Family Ericaceae
Genus Rhododendron
Species Calendulaceum
Origin United States (Appalachians)
Blooming Spring, vibrant orange-red flowers
Leaf Color Dark green turning red in autumn
Sunlight Half-shade
Category Outdoor plants
Pet Friendly close No
yard

Care & Maintenance

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Soil

Acidic peat moss mixed with pine bark and perlato (ericaceous mix), pH 4.5-6.0 essential

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Watering

Keep soil consistently moist but not waterlogged; sensitive to chlorinated tap water and lime

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Sunlight & Care

Morning sun preferred, protect from harsh afternoon heat to prevent leaf scorch in summer

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Fertilization

Use acid-loving plant fertilizer in early spring before blooming, avoid high nitrogen late season

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Pruning

Prune immediately after flowering to shape, remove dead wood in late winter

Pest Control Aphid Azalea Lace Bug Rhododendron Borer 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
5° – 86°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
40% – 70%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
3000 – 35000
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
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Soil Moisture
60% – 80%
% volumetric
Water content in the growing medium
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Soil EC
350 – 1200
mS/cm
Electrical conductivity (nutrient concentration in soil water)

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