Clethra alnifolia
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Clethra alnifolia

Coastal sweetpepperbush · Summersweet · Coastal sweet pepperbush · Pink-spire · Sweet pepperbush

Tier 2 Difficulty: easy Water: low Light: partial_sun Toxicity: low
0
Soil pH
4–6
Hardiness
Zone 3–9
Click count
1,135
Observations
839

Description

Source: leafsnap

Clethra alnifolia, commonly known as Sweet Pepperbush, is a deciduous shrub native to the eastern United States. It typically reaches a height of 3-8 feet and spreads 4-6 feet wide. In late summer, the plant produces fragrant white or pink flowers that attract bees and butterflies. The dark green leaves turn yellow in the fall before dropping off for winter dormancy. Sweet Pepperbush thrives in moist, acidic soils and partial shade but can tolerate full sun if it receives adequate moisture. It is often used as an ornamental plant for its attractive flowers, lush foliage, and vibrant fall coloration. Besides its aesthetic appeal, Clethra alnifolia has several practical uses. Native Americans used various parts of the plant for medicinal purposes, such as treating fevers and headaches. The bark was used to make baskets, and the wood was used for tool handles. Overall, Clethra alnifolia is a versatile shrub with both ornamental and practical value. Its ability to thrive in diverse growing conditions makes it a popular choice among gardeners across North America.

🌳 Summersweet is an unusual shrub that blooms late in the summer. It can be used as a hedge and also looks attractive in a shrub border. This plant is an excellent addition to naturalistic, woodland, or cottage-style gardens. Pair it with dogwood, asters, and purple coneflowers for a stunning combination.

Care Guide

💧 Water
☀️ Light Partial sun
Ideal: Partial sun
🌡️ Temperature 0–35°C
Ideal temperature: 0–35°C
💨 Humidity
Humidity:
🪴 Soil 4-6
Soil pH: 4-6
🌱 Fertilizer
🪴 Pot & Repot
✂️ Pruning
🌿 Propagating
🐛 Diseases & pets
☠️ Toxicity

Characteristics

Plant Type
Shrub
Life Cycle
Perennial
Genus
Clethra
Family
Clethraceae
Hardiness Zone
3-9
Mature Height
1.52 m to 3.05 m
Mature Spread
1.22 m to 1.83 m
Leaf Color
Green, Yellow, Brown
Leaf Type
Deciduous
Flower Color
White
Flower Size
7.62 cm to 15.24 cm
Bloom Time
Mid summer
Planting Time
Spring, Autumn
Harvest Time
Mid summer, Late summer

Tags (21)

Common Names (15)

en Coastal sweetpepperbush
en Summersweet
en Coastal sweet pepperbush
en Pink-spire
en Sweet pepperbush
en Summersweet Clethra
en Coastal sweet pepper bush
en White alder
en Sweet pepper bush
en 'Indian' soap
en Ruby Spice (Arnold Arboretum )
en Mansori
en "Pepper bush
en Summer Sparklers
en Coastal pepperbush