Aconitum carmichaelii Arendsii Group

RHS Plant Profile

monk's hood Arendsii Group

RHS

Synonyms

Aconitum × arendsii hort.

Herbaceous Perennial

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Arendsii Group is a somewhat variable, clump-forming perennial comprising erect stems to around 1.2m tall with deeply divided, dark green leaves. Unbranched spikes bear hooded, lavender-blue flowers in autumn

Position

Full sun, 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
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: East–facing or North–facing or West–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 eatenavoid skin contact. Wear gloves and other protective equipment when handling. Pets: TOXIC if eatenavoid 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 moisture retentive, fertile soil in partial shade. Staking may be necessary. See staking perennials for further advice

Propagation

Propagate by division every third year in autumn or late winter to maintain vigour, although plants can be slow to re-establish

Suggested planting locations and garden types

Cottage and informal garden
Architectural
Wildlife gardens
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 and verticillium wilt