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Clethra alnifolia Anne Bidwell

Clethra alnifolia Anne Bidwell
Panicled White Alder, Sweet Pepper Bush

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Variety with spikes of 20 to 25 cm (7.9 to 9.8 in) of small white flowers turning cream in late summer. It forms an upright and compact bush measuring 2 m (6 ft 7 in) tall and 1.2 m (3 ft 11 in) wide with glossy dark green foliage. Flowering for about 2 weeks, it is an interesting selection to complement the flowering of other cultivars. Its flowering has the merit of emitting a slight aniseed and almond scent, while its bright yellow autumn foliage extends its decorative interest until early winter. Hardy, it is an easy and low-maintenance plant that thrives in partial shade in moist, neutral to acidic soil.
Flower size
20 cm
Height at maturity
2 m
Spread at maturity
1.50 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -29°C
Soil moisture
Moist soil
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Best planting time March to April, September to October
Recommended planting time March to May, September to November
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Flowering time July to August
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Description

The Clethra alnifolia 'Anne Bidwell' is a variety appreciated for its numerous and large white and then cream spikes in late summer, slightly scented with aniseed and almond! Its bright flowering contrasts beautifully with its dark green, shiny foliage and reddish stems ! It is a small bush with a particularly erect habit, adapted to less sunny locations and cool, well-drained and acidic soils. Its leaves, similar to those of alders, turn a decorative bright yellow in autumn. Use this shrub to decorate flowerbeds or as a standalone plant, in shaded areas or smaller gardens.

 

Clethra alnifolia is a small shrub that grows spontaneously in the swamp forests of the eastern coast of the United States. It forms a small dense, wide, rounded, and slightly spreading bush, 2.5 m (8 ft 2 in) to 3 m (9 ft 10 in) tall. 

The 'Anne Bidwell' variety is a version of the Alder-leaved Clethra with large white and then cream spikes, particularly numerous in August. It forms a small bush about 2 m (6 ft 7 in) tall and 1.20 m (3 ft 11 in) wide, with an upright and bushy silhouette. When it likes its environment, it spreads through suckers to form small groves. Its multiple and upright branches bear deciduous foliage consisting of fine ovate, dentate and glabrous leaves with strongly marked veins. They appear late in spring in shades of yellow-green and then light green when mature. In autumn, the shrub turns a decorative intense yellow before the foliage falls.

The Alder-leaved Clethra 'Anne Bidwell' stands out for its abundant, large, white turning cream blooms. In July and August, the shrub is covered with numerous upright white spikes 20 to 25 cm (7.9 to 9.8 in) long. Its spiky flowers are comprise small bell-shaped flowers with feathery stamens that open from bottom to top along the cluster. The flowering of this delicately scented dwarf clethra attracts butterflies, hummingbirds, and bees beneficial to biodiversity in the garden! The flowers then give rise to small fruits in the form of brown capsules in September. This decorative fruiting persists on the shrub until winter and provides a valuable food source for birds.

 

Due to its origins, Clethra alnifolia appreciates shaded locations and cool, rich, loose soil with an acidic tendency. It is averse to high temperatures and drought, therefore, it can only be planted in full sun in moderately warm summer climates. While Alder-leaved Clethras tolerate full shade, their growth may be slower and their flowering less abundant. Very resistant to diseases and hardy (can withstand temperatures of at least -15°), this Clethra is easy to grow and will offer all its splendour with minimal care!

 

In a small garden, Clethra alnifolia 'Anne Bidwell' can be planted as a standalone plant and enliven the space with its exceptional flowering and beautiful autumn colours. This attractive small shrub will also find its place in a bed of acid-loving plants associated with the ENCORE Lily Azalea, an Early Sensation Hydrangea paniculata, or the Camellia sasanqua Choji Guruma to spread and vary the blooms. The Alder-leaved Clethra can also be used in a low hedge, combined with shrubs with decorative foliage. Its suckers make it highly appreciated for stabilising sloping soils, it will easily find its place on a slope, in damp areas, and will develop into a small grove. Its small size allows it to be grown in containers to decorate terraces and balconies, provided that it is watered regularly. Don't hesitate to plant it near a living or thoroughfare area to enjoy its delicate spicy fragrance!

Clethra alnifolia Anne Bidwell in pictures

Clethra alnifolia Anne Bidwell (Flowering) Flowering
Clethra alnifolia Anne Bidwell (Foliage) Foliage
Clethra alnifolia Anne Bidwell (Plant habit) Plant habit

Plant habit

Height at maturity 2 m
Spread at maturity 1.50 m
Habit upright, columnar
Growth rate slow

Flowering

Flower colour white
Flowering time July to August
Inflorescence Spike
Flower size 20 cm
Fragrance Fragrant, Spicy, with an almond and aniseed scent.
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Deciduous
Foliage colour dark green

Botanical data

Genus

Clethra

Species

alnifolia

Cultivar

Anne Bidwell

Family

Clethraceae

Other common names

Panicled White Alder, Sweet Pepper Bush

Origin

Cultivar or hybrid

Product reference1004522

Planting and care

Clethra alnifolia are native to the swampy forests of boreal America. They therefore appreciate shady, cool locations and rich, loose soil with an acidic tendency. They are averse to high temperatures and drought and can only be planted in full sun in moderately warm summer climates. Clethras alnifolia can tolerate full shade but their growth may be slower and their flowering less abundant.

Plant Clethra alnifolia 'Anne Bidwell' in a wide hole. Mix peat or heather compost with your garden soil to lighten and acidify it. A pine bark mulch will help retain moisture and maintain a pH conducive to growth. Water generously during the growing season, especially during the first two years after planting.

Pruning of Clethra alnifolia should be carried out at the end of winter to remove dead, diseased, or broken branches. It is also advisable to deadhead at the end of flowering to preserve the energy of the bush.

Highly resistant to diseases and hardy (it can withstand temperatures of at least -15°C (5 °F)), the Alder-leaf Clethra is enjoyable to grow and will offer all its splendour with minimal care!

Planting period

Best planting time March to April, September to October
Recommended planting time March to May, September to November

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Slope
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Acidic, Neutral
Soil type Clayey (heavy), Silty-loamy (rich and light)
Soil moisture Moist soil, Rich, cool, well-drained with a slightly acidic tendency.

Care

Pruning No pruning necessary
Soil moisture Moist soil
Disease resistance Very good
Overwinter Can be left in the ground

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