Aconitum 'Stainless Steel'

RHS Plant Profile

monk's hood 'Stainless Steel'

Synonyms

Aconitum septentrionale 'Stainless Steel'
Aconitum × cammarum 'Stainless Steel'

Herbaceous Perennial

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Upright, clump-forming perennial about 1-1.2m tall, with deeply cut dark green foliage with 5 to 7-lobes, and spikes of steely-blue hooded flowers with white centres, from early summer to autumn

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

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

Chalk Clay Loam Sand

Moisture: Moist but well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun 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 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 well-drained soil in partial shade but will tolerate most soils and full sun. Staking (see staking perennials) may be necessary

Propagation

Divide every third year in autumn or late winter to maintain vigour but sometimes plants are slow to re-establish. Use protective gloves when handling any part of the plant

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

May be susceptible to aphids

Diseases

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