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Herbaceous Perennial

Aconitum japonicum

Japanese monk's hood

A clump-forming perennial to around 1m tall with divided foliage. Panicles of hooded, deep blue to purple flowers are borne in late summer

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Size
Ultimate height
0.5–1 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Clay
Loam
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Blue Purple Green
Autumn Green
Winter
Position
  • Full sun
  • Partial shade
Aspect

West–facing or East–facing or North–facing

Exposure
Sheltered
Hardiness
H7
Botanical details
Family
Ranunculaceae
Native to the UK
No
Foliage
Deciduous
Habit
Columnar upright
Potentially harmful
All parts are highly toxic if eaten, all parts may be harmful through skin contact. Wear gloves and other protective equipment when handling
Genus

Aconitum can be herbaceous perennials or biennials with lobed leaves and racemes or panicles of showy, hooded flowers

Name status

Correct

Plant range
Japan

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How to grow

Cultivation

Best grown in moisture-retentive fertile soil in partial shade but sun and most soils are tolerated

Propagation

Divide in autumn or late winter to maintain vigour, although plants can be slow to re-establish. Use gloves when handling plants

Suggested planting locations and garden types
  • Cottage and informal garden
  • Flower borders and beds
Pruning

Tall stems can be pruned down later in autumn when flowering is finished

Pests

May be susceptible to aphids

Diseases

Fungal stem rot and Verticillium wilt may occasionally be troublesome

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