Vernonia noveboracensis White Lightning - Ironweed
Vernonia noveboracensis White Lightning - Ironweed
Vernonia noveboracensis White Lightning - Ironweed
Vernonia noveboracensis White Lightning
New York Ironweed
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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
Flowering
Foliage
Plant habit
Botanical data
Vernonia
noveboracensis
White Lightning
Asteraceae
New York Ironweed
Cultivar or hybrid
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.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
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In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.