Vernonia missurica - Ironweed
Vernonia missurica - Ironweed
Vernonia missurica - Ironweed
Vernonia missurica - Ironweed
Vernonia missurica - Ironweed
Vernonia missurica
Ironweed
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Description
Vernonia missurica is a large, hardy, robust and beautiful wild vernonia native to the banks of the Missouri River. At the end of its tall leafy stems, inflorescences composed of many small, tousled heads in shades of pink-purple to bright magenta bloom in the middle of summer. This cousin of asters is loved by butterflies and birds, endures harsh winters and scorching summers, and accepts all types of soil, including those which are sometimes dry in summer. It will thrive in a natural garden, at the back of a border, or near water.
Vernonia missurica belongs to the Asteraceae family. It is a majestic plant, widespread in the central United States (south of Ontario, Michigan, and Nebraska to the south of Alabama and Texas), where it can reach a height of 2 m (7ft). It prefers moist soils, although it can withstand temporary droughts. It is a herbaceous perennial anchored to a powerful rhizomatous crown that reaches 1.60 m (5ft) high and 50-60 cm (20-24in) wide. Its mature size will vary, depending on the growing conditions. It grows quickly but takes two years to establish. It forms a cluster of large and robust, straight, hairy, unbranched stems, bearing alternate, simple, hairy, narrow, lanceolate to ovate, dark green leaves, up to 17 cm (7in) long. In July-August, it has lots of small tousled pompom flowers in shades of violet-pink, gathered in wide, flattened terminal corymbs at the ends of the stems. The flowers all open at the same time and last a long time, attracting many butterflies and creating a magnificent spectacle. Goldfinches feast on its rusty-coloured seeds at the end of the season.
Very easy to grow and perfectly hardy, Vernonia missurica should be planted in our gardens more often. It is as easy to grow as large asters, but immune to diseases and pairs well with a multitude of plants to create magnificent autumn compositions with asters, shrubby salvias, astrantias, heleniums, and hastata verbenas, for example. In a wilder style, at the back of a border, this imposing perennial forms a very successful combination with Rudbeckia maxima and tall grasses like Miscanthus 'Malepartus', Panicum, and Stipa. It will thrive on the banks of a pond, with Joe-Pye weeds, Lythrum salicaria, Filipendula rubra 'Venusta', and Euphorbia palustris.
Vernonia missurica - Ironweed in pictures
Flowering
Foliage
Plant habit
Botanical data
Vernonia
missurica
Asteraceae
Ironweed
North America
Planting and care
Vernonia missurica is an excellent perennial plant that deserves to be better known. It thrives in sunny locations in rich and deep soils and tolerates clay and/or limestone soil very well. It withstands moderate periods of drought better than other species and also blooms quite early. In heavy soil, leaf compost and coarse sand should be incorporated when planting. The clumps can be divided in spring or autumn if they get too big. Prune 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).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
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 planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
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.