Aconitum Napellus

European Monkshood

Aconitum napellus, commonly known as Monkshood, is a classic ornamental perennial valued for its deep blue, hooded flowers, bold vertical form, and ability to thrive in cooler, partially shaded gardens. It brings a dramatic, old-fashioned look to borders and woodland settings.

Key Characteristics and Benefits


Flowers & Color: Tall spikes of intense blue to violet-blue, helmet-shaped flowers that are instantly recognizable.



Bloom Time: Mid to late summer, depending on climate.



Foliage: Deep green, deeply lobed leaves with a bold, architectural texture.



Growth Habit: Upright, clump-forming perennial that adds strong vertical interest.



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 (prefers afternoon shade in warmer regions)



Soil: Thrives in moist, well-drained, fertile soil



Water: Moderate; soil should not dry out completely



Maintenance: Low; cut back after flowering



Important Note: All parts of the plant are highly toxic if ingested; wear gloves when handling and site carefully



Summary:
Aconitum napellus is an excellent choice for perennial borders, cottage gardens, and woodland edges, offering dramatic blue color, strong structure, and late-season interest in cooler garden conditions.

Plant type

Perennial

Height

36-48"

Width

18-24"

Hardiness zones

4–9

Sunlight

Full Sun, Partial Shade

Growth rate

Moderate

Leaf color

Dark Green

Fall color

Dark Green

Soil

Clay, Loamy, Well Drained

Landscape use

Border, Mass Planting

Shape

Clumping

Drought tolerant

No