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Duo of Vernonias crinitas

Vernonia crinita sp., Alba
Tall Ironweed

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Collection contains 2 plants

  • 1 x Vernonia crinita - Ironweed
  • 1 x Vernonia crinita var. alba - Ironweed

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This plant carries a 12 months recovery warranty

More information

This duo of Vernonia crinita brings together two different varieties of vernonias, remarkable perennial plants for their late flowering and adaptability to other soil types. Vernonia crinita produces purple flower clusters, while V. crinita 'Alba' stands out with its white flowers. These plants usually bloom in late summer and autumn. Frequently used in the back of flower beds or as bank plants, they attract pollinators thanks to their abundance of nectar.
Exposure
Sun
Hardiness
Hardy down to -20°C
Soil type
Clayey (heavy), Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light)
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Best planting time March, October
Recommended planting time February to May, September to November
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Flowering time August to October
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Collection items (2 plants)

Description

This duo of Vernonia crinita and Vernonia crinita 'Alba' will delight gardeners looking for late-flowering melliferous and nectariferous plants. These tall perennials bloom from August to October with small pom-pom flowers in deep pink and white. Vernonia crinita mainly thrives in rich, moist soil in full sun. They withstand harsh winters and scorching summers without weakening and tolerate all types of soil, from moist to moderately dry. The Arkansas Ironweed deserves a place in the garden, either at the back of a border or near water features, where it will add a lot of verticality.

The duo consists of:

1 x Vernonia crinita: A perennial plant that can reach up to 2m in height, characterised by its small clusters of deep pink flowers. It usually flowers from August to October.

1 x Vernonia crinita 'Alba': This variety is mainly distinguished by its white flowers, contrasting with the deep pink version. It reaches a slightly lower height, around 1.50m, and blooms at the same time.

These Vernonia crinita will ideally thrive in full sun, in deep, loose, moist to wet, well-drained soil. Plant the taller Vernonia crinita at the back and the 'Alba' variety in front. Allow for 3 to 4 plants per square metre, with a spacing of 60cm between each plant.

To create a harmonious border, combine these Vernonia crinita with plants that have similar needs. Small blue-flowered asters, such as Aster 'Little Carlow', can be planted in the foreground. A tall grass like Panicum virgatum 'Shenandoah' will blend perfectly with these two Vernonia. In the background, plant late-flowering shrubs such as Hydrangea paniculata 'Limelight', a hydrangea with spectacular green and white panicles.

Flowering

Flower colour two-tone
Flowering time August to October
Inflorescence Flower head
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Plant habit

Height at maturity 2 m
Growth rate normal

Botanical data

Genus

Vernonia

Species

crinita

Cultivar

sp., Alba

Family

Asteraceae

Other common names

Tall Ironweed

Botanical synonyms

Vernonia arkansana

Origin

Cultivar or hybrid

Planting and care

Vernonia crinita thrives in sunny locations, moist but not too dry, rich and deep soils, even clayey ones if they are loose and malleable. It is a very cold-resistant plant that does not require much maintenance.

Planting period

Best planting time March, October
Recommended planting time February to May, September to November

Intended location

Suitable for Meadow, Pond edge
Type of use Back of border
Hardiness Hardy down to -20°C (USDA zone 6b) Show map
Ease of cultivation Amateur
Planting density 4 per m2
Exposure Sun
Soil pH Any
Soil type Clayey (heavy), Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light)
Soil moisture Moist soil, Damp soil, deep, loose, fertile

Care

Pruning instructions Prune the dry stems in late winter.
Pruning Pruning recommended once a year
Pruning time March
Disease resistance Very good
Overwinter Can be left in the ground

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