Aconitum Carmichaelii 'Arendsii'

Monkshood 'Arendsii'

Aconitum carmichaelii ‘Arendsii’ is a striking late-season perennial prized for its deep blue, hooded flowers and strong vertical presence in the garden. Blooming when many perennials are fading, it brings bold color and structure to late summer and fall landscapes.

Key Characteristics and Benefits


Flowers & Color: Tall spikes of rich violet-blue, helmet-shaped flowers held above clean foliage.



Bloom Time: Late summer through fall, providing valuable late-season interest.



Foliage: Dark green, deeply cut leaves with a bold, architectural texture.



Growth Habit: Upright, clump-forming perennial with strong stems that rarely need staking.



Size: Typically reaches 36–48 in tall with a 18–24 in spread.



Care and Requirements


Hardiness: USDA Zones 3–7



Light: Full sun to partial shade (best with afternoon shade in warmer areas)



Soil: Prefers moist, well-drained, fertile soil



Water: Moderate; do not allow soil to dry out completely



Maintenance: Low; cut back after flowering



Note: All parts are poisonous if ingested; handle with care and site appropriately



Summary:
‘Arendsii’ Monkshood is an excellent choice for perennial borders, woodland edges, and mixed shade gardens, offering dramatic late-season color, strong vertical form, and a classic cottage-garden feel.

Plant type

Perennial

Height

24-36''

Width

18-24"

Hardiness zones

3–7

Sunlight

Full Sun, Partial Shade

Growth rate

Moderate

Bloom time

Early Fall, Fall

Flower color

Dodger Blue

Leaf color

Dark Green

Fall color

Dark Green

Soil

Clay, Loamy, Well Drained

Landscape use

Border, Mass Planting

Shape

Clump

Deer resistant

Yes

Drought tolerant

No