Aconitum carmichaelii 'Arendsii'
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Aconitum carmichaelii 'Arendsii'

Aconitum carmichaelii 'Arendsii'

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SKU: S20466
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Quick Facts
Common Name: Monkshood
Hardiness Zone: 3-6S/8W Exposure: Sun to Part Shade
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Blooms In: Sep-Oct
Mature Height: 2-5' Spacing: 18-24"
Read our Growing Guide Ships as: BAREROOT
Deer Resistance: Yes
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Product Details

Product Details

When the perennial garden slips into its late summer slump, stately Aconitum carmichaelii 'Arendsii' steps up with tall spikes of azure-blue flowers that continue on into autumn. This Monkshood plant is a handsome partner for Japanese Anemones. A bonus: Deer generally avoid Monkshood.

The genus Aconitum includes many stunningly beautiful varieties whose shapely late-summer flowers and handsome, deeply cut foliage can carry a border through the dog days until Chrysanthemums come into flower. Aconitums thrive on good soil and do as well in light shade as in sun. They need reliable moisture during droughty spells and will perish where water stands, but otherwise seem willing to prosper for many years with minimal attention. All parts are very poisonous and should not be planted near vegetables or where children play.

For more information on growing and care, click on Growing Guide.




The size of the plants we ship has been selected to reduce the shock of transplanting. For some, this means a large, bareroot crown. Others cannot travel bareroot or transplant best if grown in containers. We ship these perennials and annuals in 1 pint pots, except as noted. We must point out that many perennials will not bloom the first year after planting, but will the following year, amply rewarding your patience. We ship bulbs as dormant, bare bulbs, sometimes with some wood shavings or moss. Shrubs, Roses, vines, and other woody plants may be shipped bareroot or in pots. The size of the pot is noted in the quick facts for each item.


We ship our bulbs and plants at the right time for planting in your area, except as noted, with orders dispatched on a first-come, first-served basis by climate zone. We also ship a wide range of containers and planters, tools, supplies, fertilizers, garden wear, garden decor items, as well as indoor decorations like wreaths and dried bouquets when available. Estimated dates for shipping are indicated in the green Shipping Details box for each item. Please supply a street address for delivery. Kindly contact us with two weeks notice, if you'll be away at the expected time of delivery.


We guarantee to ship plants that are in prime condition for growing. If your order is damaged or fails to meet your expectations, we will cheerfully replace or refund it. Please contact our Customer Service Department at 1-800-503-9624 or email us at [email protected]. Please include your order number or customer number when contacting us.



Average Customer Rating: 3.5 out of 5 stars (3 Reviews) Write a Review

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Bloomed the First Year

I planted these in March when they arrived. We had a freak freeze in early April. I thought they were going to die, but, they survived and bloomed from August to November. I love the color and the height they provide behind the Japanese anemone.

8 of 8 people found this review helpful. Do you? yes no  Certified buyer

Beautiful and beneficial for the ecosystem

It's a mistake to give this plant a 1 star review, or a low rating, simply because it's toxic. It's a beautiful plant that is beneficial for bumblebees, which are important pollinators. A lot of garden plants are toxic. Take precautions. Worse yet, some, like nandina, will kill beneficial wildlife. This plant, by contrast, is a valuable source of nectar for long-tongued bumblebees. Plants like nandina are 1 star plants. This plant is certainly not. Many garden plants are next to worthless for wildlife, too.

72 of 74 people found this review helpful. Do you? yes no

Caution should be used

As lovely as this plant is, it is toxic and protective gloves should be worn when handling any part of the plant. Do not leave pieces of the roots around in case of ingestion by animals.

12 of 60 people found this review helpful. Do you? yes no

Growing guide

Growing guide
Print Grow Guide

Latin Name Pronunciation: a-ko-nye'tum 

SPACING: 18-24in, DEPTH: Level (potted)/1in (bareroot).

CULTURE: Good rich, evenly moist but well-drained soil. Full sun to partial shade (partial shade is required in warm inland areas of the West). Fares poorly in hot, dry sites. Slow to become established but in time forms impressive clumps. Long lived where conditions suit it. In partial shade, 'Sparks Variety' may require staking, or a sturdy neighbor, to keep it upright. Deer and rabbit resistant.

PROBLEMS: Seldom has disease or pest problems. All parts are very poisonous and should not be planted near vegetables or where children play.

SUGGESTED USE: Good addition for the back of the border, or for a cutting garden. Combines well with Echinacea, Helenium and fall-blooming Anemone.