Aconitum napellus subsp. vulgare 'Albidum'

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white monk's hood

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white monk's hood RHS
white monk's hood RHS

Synonyms

Aconitum carmichaelii 'Album', Aconitum compactum album, Aconitum napellus 'Albidum', Aconitum napellus 'Albiflorus', Aconitum napellus 'Album'

Herbaceous Perennial
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Clump-forming herbaceous perennial to about 1.5m in height, with dark green, finely divided, dark green leaves with narrow leaf lobes, and unbranched spires of hooded white flowers, slightly flushed grey, from mid to late summer

Position

Partial shade

Soil Types

Clay, Loam

Max Height

1-1.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
1-1.5 metres

Growing Conditions

Clay Loam
Moisture
Moist but well–drained or Well–drained
pH
Acid or Alkaline or Neutral

Position

Partial shade
Aspect
North–facing or West–facing or East–facing
Exposure
Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Ranunculaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Potentially harmful
TOXIC if eaten; avoid skin contact. Wear gloves and other protective equipment when handling. Pets: TOXIC if eaten; avoid skin contact - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus
Aconitum can be herbaceous perennials or biennials with lobed leaves and racemes or panicles of showy, hooded flowers
Name Status
Accepted

How to Grow

Cultivation

Best grown in cool, moist, fertile soil in partial shade, but will tolerate most soils and full sun if soil is improved with well-rotted organic matter and mulched

Propagation

Propagate by division in autumn or late winter to maintain vigour but plants may be slow to re-establish. Use protective gloves when handling any part of the plant

Suggested planting locations and garden types

  • Cottage and informal garden
  • Wildlife gardens
  • Architectural
  • Flower borders and beds

Pruning

No pruning required except cutting back dead stems; use protective gloves

Pests

Generally pest-free but may be susceptible to aphids

Diseases

May be susceptible to fungal stem rot, Powdery mildews, and Verticillium wilt