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Annual Biennial

Carduus crispus

welted thistle

The welted thistle is a branched biennial reaching up to 1.5m in height. Leaves are pinnately lobed. Downy stems are spiny and winged until just below the terminal clusters of purpleflowers. These are encased in woolly bracts, opening in June and August.

Synonyms
Carduus acanthoides misapplied
Size
Ultimate height
1–1.5 metres
Time to ultimate height
1–2 years
Ultimate spread
0–0.1 metre
Growing conditions
Chalk
Clay
Loam
Sand
Moisture
Moist but well–drained, Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Purple Green
Autumn Green
Winter Green
Position
  • Full sun
Aspect

East–facing or North–facing or South–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H5
Botanical details
Family
Asteraceae
Native to the UK
Yes
Foliage
Semi evergreen
Habit
Bushy
Name status

Correct

Plant range
Europe, N Asia

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How to grow

Cultivation

Occurs naturally in w wide range of soils in scrub, woodland glades and verges

Propagation

Propagate by seed

Suggested planting locations and garden types
  • Wildflower meadow
  • Wildlife gardens
Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free

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