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Vernonia noveboracensis White Lightning - Ironweed

Vernonia noveboracensis White Lightning
New York Ironweed

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Vernonia noveboracensis 'White Lightning' is a tall perennial plant with fluffy white autumn flowers. From August to October, it will enhance the background of flower beds with its large umbels carried on straight and sturdy stems. Its flowers have ruffled petals and contrast nicely with its dark green, narrow and lanceolate foliage. Easy to grow and hardy, this vernonia just needs to be planted in rich and moist soil. It will be perfect in an informal, wild, romantic garden, at the back of a flower bed or along a pond where it will bring hight and light.
Flower size
8 cm
Height at maturity
2 m
Spread at maturity
80 cm
Exposure
Sun
Hardiness
Hardy down to -23°C
Soil moisture
Moist soil, Damp soil
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Best planting time March, October
Recommended planting time February to April, September to November
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Flowering time August to November
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Description

Vernonia noveboracensis ‘White Lightning’ is a tall perennial with fluffy white autumn flowers. From August to October, it will enhance the back of borders with its large umbels carried on straight and sturdy stems. Its flowers have ruffled petals and contrast beautifully with its dark green, narrow and lanceolate foliage. Easy to grow and very hardy, this vernone just needs to be planted in rich and moist soil. It will be perfect in an informal, wild, romantic garden, at the back of borders or on the edge of a pond where it will bring height and light.

 

Vernonia noveboracensis ‘White Lightning’ belongs to the Asteraceae family. Native to the Northeast of the United States, Vernonia is named after the English botanist William Vernon. Vernonia noveboracensis means "Vernone from New York"; the cultivar ‘White Lightning’ was a new introduction in 2014 by the German company Jelitto Staudensamen. This herbaceous perennial with a woody base will reach approximately 2m (7ft) high with a spread of 80cm (32in). Its grows quite quickly, but takes two years to establish. It forms a clump of large and robust, straight and sparsely branched stems, carrying alternate, simple, narrow lanceolate, dark green leaves. From August to October, or even November, it has lots of small, fluffy, bright white pompons flowers, arranged in larger terminal corymbs than the species, turning rust-coloured with age (hence the name "ironweed"). The flowers all open at the same time, last a long time and attract a large number of butterflies, providing a magnificent spectacle.

 

This very hardy vernone is easy to grow, pairs well with lots of plants and creates magnificent autumn compositions on the edges of a pond. Plant it alongside eupatoires, which it resembles, or Lythrum salicaria, Filipendula rubra 'Venusta' and Euphorbia palustris. In a wilder style, at the back of borders, this imposing perennial forms a very successful combination with large grasses: Miscanthus, Panicum, Stipa...

Vernonia noveboracensis White Lightning - Ironweed in pictures

Vernonia noveboracensis White Lightning - Ironweed (Flowering) Flowering
Vernonia noveboracensis White Lightning - Ironweed (Foliage) Foliage

Flowering

Flower colour white
Flowering time August to November
Inflorescence Umbel
Flower size 8 cm
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Deciduous
Foliage colour dark green

Plant habit

Height at maturity 2 m
Spread at maturity 80 cm
Growth rate normal

Botanical data

Genus

Vernonia

Species

noveboracensis

Cultivar

White Lightning

Family

Asteraceae

Other common names

New York Ironweed

Origin

Cultivar or hybrid

Product reference858911

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Planting and care

Vernonia noveboracensis 'White Lightning' is an excellent perennial plant that deserves to be better known. It thrives in sunny locations and prefers moist, rich, and deep soils, even clay if not waterlogged. Add leaf compost and coarse sand to heavy soil when planting. The clumps can be divided in spring or autumn if they get too big. Cut back the dried vegetation at the end of flowering.

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Planting period

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

Intended location

Suitable for Meadow, Pond edge
Type of use Back of border
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun
Soil pH Neutral
Soil type Clayey (heavy), Silty-loamy (rich and light)
Soil moisture Moist soil, Damp soil, Fresh, fertile, well-draining

Care

Pruning instructions Cut the faded flowers to prevent self-seeding. Pruning the stems at the end of spring (Chelsea chop) will limit the height.
Pruning Pruning recommended once a year
Pruning time May, November
Disease resistance Good
Overwinter Can be left in the ground

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