How to Care for Monkshood ‘Arendsii’ (Aconitum carmichaelii)

Aconitum carmichaelii ‘Arendsii’, commonly known as Monkshood ‘Arendsii’, is a stunning perennial plant known for its beautiful, deep purple-blue flowers that resemble hooded monks. This unique and showy plant adds a touch of elegance and charm to any garden, while also providing cut flowers for indoor arrangements. In this article, we will discuss the essential care and maintenance tips for growing and maintaining Monkshood ‘Arendsii’ in your garden, as well as its growth rate, height, size, and spread, ideal growing regions, and companion plants.

Main Caring Considerations


Monkshood ‘Arendsii’ requires average watering to maintain its health and vigor. Keep the soil consistently moist, but not soggy, as over-watering can lead to root rot and other issues. During periods of drought or extreme heat, increase the frequency of watering to prevent the plant from drying out.

Light Care

This perennial plant thrives in both full sun and partial sun exposure. However, it prefers some shade during the hottest part of the day, especially in warmer climates. Providing the right amount of sunlight ensures healthy growth and vibrant blooms.

Soil Care

Monkshood ‘Arendsii’ prefers moist but well-drained soil with a slightly acidic to neutral pH. It can tolerate a wide range of soil types, including clay and loam, making it versatile for various garden settings. If your soil is too alkaline, amending it with organic matter or sulfur can help lower the pH to a more suitable level for this plant.

Growing Region

This plant is well-suited for growing in USDA Hardiness Zones 3 to 8. It can tolerate cold temperatures and is relatively hardy, making it an excellent option for gardens in colder climates.

Growth Rate, Height, Size, and Spread

Monkshood ‘Arendsii’ grows at a moderate rate and can reach heights of 2 to 5 feet (60cm to 150cm) and a spread of 1 to 2 feet (30cm to 60cm). Its size and height make it an excellent choice for planting in beds, borders, and traditional gardens, as well as informal and cottage-style gardens.

Season and Temperature

Monkshood ‘Arendsii’ blooms in late summer and early fall, adding a burst of color to your garden during a time when many other plants have finished flowering. It is hardy in USDA Zones 3 to 8, making it suitable for a wide range of temperatures and climates.


Pruning is not necessary for Monkshood ‘Arendsii’, but if desired, you can trim back any dead or damaged foliage in the spring to promote healthy growth and maintain a tidy appearance. After flowering, you can also cut back the spent flower stalks to encourage a second flush of blooms.


Monkshood ‘Arendsii’ produces showy, deep purple-blue flowers in late summer and early fall. These unique, hooded flowers are eye-catching and make excellent cut flowers for indoor arrangements.


This plant is resistant to deer and rabbit browsing, making it an excellent choice for gardens that struggle with these common pests. However, it can be susceptible to snails and slugs, so take precautions to protect your plant from these pests.


Monkshood ‘Arendsii’ is not particularly attractive to pollinators, but its resistance to deer and rabbit browsing makes it a valuable addition to gardens where these creatures are a problem.

Garden Styles

This plant is well-suited for traditional, informal and cottage-style gardens, as well as beds and borders. Its unique and showy flowers add a touch of elegance and charm to any garden setting.

Companion Plants

Monkshood ‘Arendsii’ pairs well with other late-blooming perennials such as asters, Japanese anemones, and goldenrod. It also complements plants with contrasting foliage, such as hostas or ferns, which provide an attractive backdrop for its vibrant blooms.

Frequently Asked Questions

Is Monkshood ‘Arendsii’ toxic?
Yes, all parts of the plant, including the roots, leaves, and flowers, are toxic if ingested. Keep children and pets away from this plant and always wear gloves when handling it.

Can I grow Monkshood ‘Arendsii’ in a container?
Yes, this plant can be grown in a container, provided it has adequate drainage and is given proper care. Be sure to select a large enough container to accommodate its mature size.

How long does it take for Monkshood ‘Arendsii’ to bloom?
Monkshood ‘Arendsii’ typically blooms in its second or third year, depending on the growing conditions and care it receives.


Monkshood ‘Arendsii’ is a stunning and versatile perennial plant that adds a touch of elegance and charm to any garden. By following the care tips outlined in this article, you can ensure that your Monkshood ‘Arendsii’ thrives and provides you with beautiful, showy blooms for years to come. Happy gardening!

Martin Duran

Hey y'all! My name is Martin Duran and I am from Cali, Colombia. Since 2018 I have been learning about plants and how to take care of them. Here's is my journey... “The clearest way into the Universe is through a forest wilderness.” ― John Muir

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