Vernonia crinita var. alba - Ironweed
Vernonia crinita var. alba - Ironweed
Vernonia crinita var. alba
Arkansas Ironweed
A good plant in purple. So I guess it's a good plant in white. With my thanks.
PATRICK, 16/08/2019
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This plant carries a 12 months recovery warranty
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We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
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Description
Vernonia crinita var. alba is a tall perennial reaching 2m (7ft) high, the white form of the purple species with beautiful clusters of small white flowers in early summer. Related to asters and resembling eupatoriums, it withstands harsh winters and scorching summers without weakening and tolerates all soil types as long as they are not too dry. It undoubtedly deserves a place in the garden, at the back of a border or near water features, where it will add height.
Vernonia crinita var. alba belongs to the Asteraceae family. It is a majestic plant native to North American meadows where it can reach 3m (10ft) high. In our gardens, it is a herbaceous perennial with a woody crown that will reach 2m (7ft) high and spread 50cm (20in) wide. It grows rapidly but takes two years to establish. It forms a clump of large, sturdy, upright and sparsely branched stems, with alternate, single, lance-shaped, dark green leaves. From July-August to September-October, it produces many small, white, tousled pompon flowers in clusters at the ends of the stems, which turn rusty with age. The flowers appear all at once, and last a long time, attracting lots of butterflies to create a magnificent spectacle.
Vernonia crinita var. alba is hardy and easy to grow and blends well with many plants to create stunning autumn compositions. On the banks of a pond it pairs well with eupatoriums, Lythrum salicaria, Filipendula rubra 'Venusta' or Euphorbia palustris. For a wilder style, at the back of a border, this imposing perennial works well with tall grasses like Miscanthus 'Malepartus', Panicum, Stipa...
Vernonia crinita var. alba - Ironweed in pictures
Flowering
Foliage
Plant habit
Botanical data
Vernonia
crinita
var. alba
Asteraceae
Arkansas Ironweed
North America
Planting and care
Vernonia crinita var. alba is an excellent perennial plant that deserves to be better known. It thrives in sunny locations and prefers moist, rich, and deep soils, even clayey ones if they are not waterlogged. In heavy soils, leaf compost and coarse sand should be incorporated when planting. The clumps can be divided in spring or autumn if they get too big. Trim back after 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).
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.
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