Vernonia noveboracensis
New York ironweed
A tall, herbaceous perennial to 2m with stiff, upright stems carrying narrow, pointed leaves and topped with open, branched clusters of purple, thistle-like flowers in late summer and early autumn
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Size
Ultimate height
1.5–2.5 metresTime to ultimate height
2–5 yearsUltimate spread
0.5–1 metresGrowing conditions
Moisture
Moist but well–drained, Poorly–drainedpH
Acid, Alkaline, NeutralColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | Green | |||
|---|---|---|---|---|
| Summer | Purple | Green | ||
| Autumn | Purple | Green | ||
| Winter |
Position
- Full sun
- Partial shade
Aspect
South–facing or West–facing
Exposure
Exposed or Sheltered Hardiness
H7Botanical details
- Family
- Asteraceae
- Native to GB / Ireland
- No
- Foliage
- Deciduous
- Habit
- Columnar upright
- Genus
Vernonia are annuals, perennials, climbers, sub-shrubs, shrubs and trees, though only the perennials are in cultivation. They have upright stems, simple, stalkless leaves and flat branched heads of tubular purple or reddish pink, occasionally white, flowers
- Name status
Correct
- Plant range
- E USA & New Mexico
How to grow
Cultivation
Grow in any light, moist soil in full sun or partial shade
Propagation
Propagate by seed or division
Suggested planting locations and garden types
- Cottage and informal garden
- Prairie planting
- Flower borders and beds
Pruning
Deadhead regularly to prolong flowering
Pests
May be susceptible to slugs
Diseases
Generally disease-free
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