Clethra alnifolia

Summersweet / Sweet Pepperbush

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Deciduous shrub native to Eastern North America, prized for fragrant white racemes in late summer and vibrant autumn foliage.
yard Outdoor plants wb_sunny Half-shade pets Pet Friendly
info Pot sizes shown are estimations. Real dimensions may vary depending on the merchant.
Merchant Pot Size Availability Price
Amazon.com 11-12 in In Stock $66.99 Buy
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Plant Details

Common Name Summersweet / Sweet Pepperbush
Family Clethraceae
Genus Clethra
Species Alnifolia
Origin Eastern North America
Blooming Late summer, fragrant white racemes attract pollinators.
Leaf Color Green turning orange/red in autumn
Sunlight Half-shade
Category Outdoor plants
Pet Friendly check Yes
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Care & Maintenance

terrain
Soil

Moist, acidic to neutral soil rich in organic matter; tolerates wet conditions.

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Watering

Keep soil consistently moist during growing season; drought tolerant once established but prefers moisture.

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Sunlight & Care

Full sun for best flowering and fall color; tolerates partial shade.

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Fertilization

Apply slow-release granular fertilizer in early spring before new growth emerges.

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Pruning

Prune after flowering to maintain shape and remove dead wood; minimal pruning required.

Pest Control Aphid Leafhopper Scale Insect

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 4 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
eco Leaf Persistence 8 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
thermostat

Growing Parameters

thermostat
Temperature
-0° – 95°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
30% – 90%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
2000 – 50000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
1200 – 3800
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
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Soil Moisture
40% – 90%
% volumetric
Water content in the growing medium
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Soil EC
400 – 2500
mS/cm
Electrical conductivity (nutrient concentration in soil water)

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