Aconitum Arendsii
Aconitum Arendsii
Aconitum Arendsii
Aconitum Arendsii
Aconitum Arendsii
Aconitum Arendsii
Aconitum Arendsii

Aconitum Arendsii
Free Gift



Good for cutting

Perfect for pots

Loved by pollinators

RHS Award of Garden Merit

Packed in peat-free compost

Hardy throughout the UK


Few plants in late summer and autumn provide such intense blue flowers as Aconitum 'Arendsii'. Blooming later than most other Aconitum species, this beautiful hardy perennial is sometimes referred to as the autumn-flowering Monkshood, (the name of which is given because its hooded flowers resemble the hoods worn by medieval monks). From July onwards, it produces dense spires of rich azure-blue flowers. Stems are generally thicker than most other forms of Aconitum, this plant is less likely to need staking! It is also suitable for growing in a patio container.

Aconitum is the perfect cottage garden plant, and it is great for planting in front of tall shrubs, or under garden trees – provided the soil does not become too dry. This plant has a special relationship with bumble bees, as they are one of the few insects that are able to reach the nectar, hidden deep inside the hooded flower. In trials, Aconitum carmichaelii (Arendsii Group) 'Arendsii' has performed so well that it has received an Award of Garden Merit from the Royal Horticultural Society (RHS).

Caution: Toxic if eaten, and it is best to use gloves when handling.


Intense blue


90-150 cm / 36-60"

Planting season:


Flowering time:


Botanical name:

Aconitum carmichaelii (Arendsii Group) 'Arendsii'

Light requirements:

Partial shade / full sun

Soil moisture:

Any soil, well-drained





  • Plant your Aconitum bare roots outside during spring or autumn
  • Select an area with moderately fertile, humus-rich soil, that is in full sun or part shade
  • Set plants 50-70cm apart or individually in large containers
  • Select an area with moderately fertile, humus-rich soil, that is in full sun or part shade; avoid any soil that becomes waterlogged
  • If growing Monkshood in a pot, use well-drained soil mix of equal parts loam, leaf mould (or soil-less compost)
  • Water-in after planting and, while in growth, do not let the soil become dry
  • For best foliage and flowers, apply a balanced fertiliser in April and again in July
  • Deadhead as necessary, to prolong the flowering season
  • After several years, lift and divide congested clumps in autumn or spring
  • Read more in our planting guide

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