Vernonia crinita Mammuth - Ironweed
Vernonia crinita Mammuth - Ironweed
Vernonia crinita Mammuth - Ironweed
Vernonia crinita Mammuth - Ironweed
Vernonia crinita Mammuth
Arkansas Ironweed
Planted by the book, I didn't get any results. I'm waiting for spring to see if the plant regrows.
Andrian, 02/03/2024
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Description
Vernonia crinita 'Mammuth' is a very tall perennial related to asters and resembling eupatoriums. It forms a large clump adorned in late summer with numerous compound, violet mauve and slightly crumpled flowers. Withstanding harsh winters and scorching summers without weakening, it will grow in all types of soil as long as they are not too dry. Still relatively uncommon in Europe, this sturdy American plant explodes in a fireworks display when in bloom. It will fit well in informal, somewhat wild gardens, where its robustness makes a difference. It is an ideal plant to bring height to the back of a border, or near water features.
Vernonia crinita 'Mammuth' belongs to the asteraceae family. It is a herbaceous perennial with a woody base that reaches 1.70 m (6ft) high and spreads 50 cm (20in) across. Its growth is quite rapid, but it takes two years to establish. It forms a clump of large and robust, straight and sparsely branched stems, bearing alternate, simple, lance-shaped, dark green leaves. From July-August to September-October, it has violet-mauve flowers, resembling fluffy little pompoms, which turn rusty as they age, in broader terminal corymbs than the species, at the end of the stems. The long-lasting flowers all open at the same time and attract a large number of butterflies, creating a magnificent spectacle.
This highly hardy vernonia is easy to grow and pairs well with a multitude of plants to create magnificent autumn compositions, especially on the banks of a pond. Plant it alongside similar-looking eupatoriums, Lythrum salicaria, Filipendula rubra 'Venusta', and Euphorbia palustris, for example. In a wilder style, at the back of a border, this imposing perennial forms a very successful combination with tall grasses: Miscanthus, Panicum, Stipa...
Vernonia crinita Mammuth - Ironweed in pictures
Flowering
Foliage
Plant habit
Botanical data
Vernonia
crinita
Mammuth
Asteraceae
Arkansas Ironweed
Cultivar or hybrid
Planting and care
Vernonia crinita 'Mammuth' 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 as long as they are not waterlogged. Incorporate leaf compost and coarse sand when planting in heavy soil. The clumps can be divided in spring or autumn if they become too large. 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.