Vernonia baldwinii - Ironweed
Vernonia baldwinii - Ironweed
Vernonia baldwinii - Ironweed
Vernonia baldwinii
Western Ironweed
Hasn't sprouted yet, is that normal?
patricia, 21/05/2025
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This plant carries a 12 months recovery warranty
More information
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 baldwinii is wild vernonia native to the central-southern United States, a robust plant capable of competing with the tall grasses of the North American prairie. This perennial, with its large leafy stems, often exceeds 1 metre (3 feet) high. It produces large terminal inflorescences composed of small pink-violet, tousled heads for about a month in the heart of summer. It is related to asters and loved by bees and butterflies. It withstands harsh winters, scorching summers, and accepts all types of soils if they are not too dry. It can be a bit invasive where it is happy and will settle in a natural garden, at the back of a flower bed or near water.
Vernonia baldwinii belongs to the Asteraceae family. It is a majestic plant, widespread in Missouri, Texas, Oklahoma, and Arkansas, where it grows in meadows and along roads and waterways, sometimes reaching a height of 2m (7ft). Here, it is a herbaceous perennial with a powerful rhizomatous crown that reaches a height of 1.30m (4ft) and occupies 50cm (20in) of ground space, spreading over time. It grows quite quickly, but takes two years to establish itself. It forms a clump of tall and sturdy, straight, hairy, unbranched stems, bearing alternate, simple lance-shaped leaves with toothed margins. The dark green leaves are 12cm (5in) long and 5cm (2in) wide. From July-August to September-October, depending on the climate, it has many flowers, like small tousled, pink-violet pompoms gathered in flattened terminal corymbs at the ends of the stems. The long-lasting flowers all open at the same time, attracting lots of butterflies. Goldfinches feast on its seeds at the end of the season.
Vernonia baldwinii is very hardy and easy to grow and sometimes becomes invasive in favourable conditions. For this reason, it is best reserved for large gardens, along watercourses, and in natural meadows, where there is no problem with it spreading. It pairs well with a multitude of plants and forms beautiful autumn compositions. On the banks of a pond, it blends with similar-looking joe-pye weeds, Lythrum salicaria, Filipendula rubra 'Venusta', Euphorbia palustris. In a more wild style, at the back of a flower bed, this imposing perennial forms a very successful combination with Rudbeckia maxima and tall grasses like Miscanthus 'Malepartus', Panicum, Stipa...
Vernonia baldwinii - Ironweed in pictures
Flowering
Foliage
Plant habit
Botanical data
Vernonia
baldwinii
Asteraceae
Western Ironweed
North America
Planting and care
Vernonia baldwinii is an excellent perennial plant that deserves to be used more. It thrives in sunny locations and prefers relatively rich and deep soils, but will tolerate clayey and rocky soils, as long as they are not waterlogged. It is more drought-tolerant than other species and blooms earlier. In heavy soil, leaf compost and coarse sand should be incorporated when planting. Clumps that have become too large can be divided in spring or autumn. Cut back 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).
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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