Vernonia lettermannii - Ironweed
Vernonia lettermannii - Ironweed
Vernonia lettermannii - Ironweed
Vernonia lettermannii - Ironweed
Vernonia lettermannii
Narrow-leaf Ironweed
Arrived in a sad state upon delivery. Despite my efforts, they did not recover.
Eliane, 14/09/2024
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Description
Vernonia lettermannii is a wild vernonia native to Arkansas, a perennial plant that hides great robustness under its graceful appearance. It forms a large clump of stems adorned with very fine foliage and displays numerous inflorescences composed of fine, tousled aster flowers in a beautiful purple colour at the end of summer. North American vernonias are relatively underused, charming plants, highly resistant to cold, and easy to grow in sunny locations with good, slightly moist soil in summer. Just like asters, which bloom at the same time, they are excellent plants for flower beds.
Vernonia lettermanii belongs to the Asteraceae family. This species is found in the central west of Arkansas and neighbouring Oklahoma. Its natural habitat consists of gravel banks found along watercourses as well as adjacent rocky outcrops in dry to occasionally flooded areas. It is a herbaceous perennial plant anchored by a strong taproot that will reach 1m (3ft) high and occupy 1.20m (4ft) of ground space without being invasive. Its growth rate is moderate, taking two years to establish, but it has a long lifespan. This vernonia forms a large clump of straight and sturdy, unbranched stems, carrying alternate, simple, thread-like, dark green leaves up to 7.5cm (3in) long. From August to September-October depending on the climate, it has lots of violet, 2.5cm (1in) wide flower heads, gathered in terminal corymbs at the ends of the stems. The flowers all open at the same time, attracting a large number of butterflies for a magnificent spectacle. The deciduous vegetation emerges in spring and dies in winter.
Vernonia lettermannii is very easy to grow and blends well with a multitude of plants to form magnificent autumn compositions with asters, shrubby salvias, masterworts, heleniums, and vervain hastata, for example. In a wilder style, at the back of a flower bed, this imposing perennial forms a very successful combination with Rudbeckia maxima and tall grasses such as Miscanthus 'Malepartus', Panicum, Stipa...
Vernonia lettermannii - Ironweed in pictures
Flowering
Foliage
Plant habit
Botanical data
Vernonia
lettermannii
Asteraceae
Narrow-leaf Ironweed
North America
Planting and care
Vernonia lettermannii is an excellent perennial plant that thrives in very sunny exposures, in rich and deep soils. It tolerates clayey and limestone or rocky soils very well, but not suffocating ones. It can withstand periodically flooded rocky terrains and tolerates occasional drought periods better than other species. Add leaf compost and coarse sand to heavy soil at planting. Clumps that have become too big 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).
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.