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Wisteria frutescens var. macrostachya Clara Mack

Wisteria frutescens var. macrostachya Clara Mack
American Wisteria

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A stunning American wisteria that produces dense clusters of up to 50 beautifully fragrant white flowers. They are 20 to 30cm (8 to 12in) long. It is a particularly cold-resistant variety as its flowers are produced on the current year's wood. Slightly less vigorous than Asian wisterias, this 5 to 6m (16 to 20ft) tall climber first blooms in June, among the foliage, and then more sporadically during summer. 
Flower size
30 cm
Height at maturity
5.50 m
Spread at maturity
4 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -23°C
Soil moisture
all types
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Best planting time March, October
Recommended planting time February to May, September to November
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Flowering time June to September
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Description

Wisteria 'Clara Mack' is a beautiful variety of American wisteria with pure white flowers. It is renowned for its unparalleled cold resistance and appreciated for its moderate growth. Its dense clusters of flowers exude a sweet grape scent that is particularly pleasant. This climber first blooms in June, among foliage that is darker and shinier than that of Chinese and Japanese wisterias. They are produced again, more sporadically, throughout summer. Like most American wisterias, this species blooms from a young age

 

American wisteria is a woody and deciduous climbing plant belonging to the large Fabaceae family, just like clover, alfalfa, and lupins. Its subspecies macrostachya, which is more northern, is native to moist forests and stream banks in a geographical area ranging from the south of Missouri and Illinois to the east of Kentucky. Its long voluble stems, slightly less vigorous than those of Chinese wisteria, are hairy when young and quickly lignify. It is undemanding in terms of soil (although it fears active limestone), and can grow in periodically waterlogged or, conversely, poor and fairly dry soils in summer, if they are deep. This species is considered more cold-resistant than Asian wisterias because it produces flower buds on the current year's wood rather than in summer, which protects the flowering from heavy frosts.

The stems of 'Clara Mack' can easily reach 5 to 6m (16 to 20ft) in length, and they naturally wrap around supports in a counterclockwise direction. The growth of new shoots is very rapid, reaching 1 to 2m (3 to 7ft) in a single season if planted in moist soil. The main flowering of this variety occurs in May-June, depending on the climate, on young plants. It is less abundant than that of Chinese and Japanese wisterias, and it develops among the leafy foliage. It produces long clusters measuring 25 to 30cm (10 to 12in), in which up to 50 small white papilionaceous flowers are tightly packed. They emit a pleasant fragrance in calm weather. They open from the base to the tip of the cluster. The plant easily re-blooms during summer. The young bronze leaves then turn a slightly shiny dark green colour, before turning yellow in autumn and falling. They are 10 to 30cm (4 to 12in) long and divided into 9 to 15 ovate leaflets, giving the foliage a light appearance. Its flowering is nectar-rich and attractive to bees. The brown fruit is a flattened pod, 5 to 10cm (2 to 4in) long, which persists until winter. It contains numerous small brown kidney-shaped seeds. It can live well over 50 years.

 

'Clara Mack' is the perfect choice for gardens in areas with long, cold winters. This grand romantic plant can enhance any facade or structure, no matter how modest. It is particularly useful for covering a wall or unsightly fence, wrapping around any sufficiently sturdy support. Plant it in a solitary position, in full sun or partial shade in warm climates. Alternatively, plant it with vigorous climbers such as Clematis montana, a trumpet creeper, or even an aristolochia. With patient and regular pruning, this climber can become a magnificent small tree that can be prominently placed in the garden.

However, be patient! Its first flowering only appears after 2 to 3 years, depending on growing conditions.

 

Wisteria frutescens var. macrostachya Clara Mack in pictures

Wisteria frutescens var. macrostachya Clara Mack (Flowering) Flowering
Wisteria frutescens var. macrostachya Clara Mack (Plant habit) Plant habit

Plant habit

Height at maturity 5.50 m
Spread at maturity 4 m
Growth rate fast

Flowering

Flower colour white
Flowering time June to September
Inflorescence Cluster
Flower size 30 cm
Fragrance Fragrant, Grape and honey.
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Deciduous
Foliage colour dark green

Botanical data

Genus

Wisteria

Species

frutescens var. macrostachya

Cultivar

Clara Mack

Family

Fabaceae

Other common names

American Wisteria

Origin

Cultivar or hybrid

Product reference1009361

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Planting and care

American wisteria is an easy-to-grow plant if the soil is sufficiently deep and moist. It can grow in any garden soil, with a preference for poor and slightly acidic soils. It may wither in overly calcareous soil (pH>7.5). Once established, it can withstand summer drought fairly well and does not require watering in most of our regions, except perhaps in warmer climates. Conversely, it can tolerate soils that are occasionally waterlogged. Plant it along a wall or train it on a pergola. Pruning is recommended to achieve better flowering, and even multiple flowerings in the season.

Wisterias can be trained as trees by growing them on a "parasol" stake measuring 1.5 to 2m (5 to 7ft), or used as ground cover in a large wild garden.

Planting period

Best planting time March, October
Recommended planting time February to May, September to November
Type of support Arbour, Tree

Intended location

Suitable for Meadow, Woodland edge
Type of use Free-standing, Climbing
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Beginner
Exposure Sun, Partial shade
Soil pH Acidic, Neutral
Soil moisture all types, Deep, loose, and moist

Care

Pruning instructions Pruning is recommended to achieve better flowering. In March-April, after the last true frosts and when the buds have appeared, cut the new branches after two or three buds, and remove weak branches. Formative pruning is done in August.
Pruning Pruning recommended once a year
Pruning time March to April, August
Soil moisture all types
Disease resistance Very good
Overwinter Can be left in the ground

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