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Hardiness: USDA Zone 3a: to -39.9 °C (-40 °F) USDA Zone 3b: to -37.2 °C (-35 °F) USDA Zone 4a: to -34.4 °C (-30 °F) USDA Zone 4b: to -31.6 °C (-25 °F) USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F)
Sun Exposure: Sun to Partial Shade
Danger: All parts of plant are poisonous if ingested
Bloom Color: Blue-Violet
Bloom Time: Late Summer/Early Fall
Foliage: Herbaceous Blue-Green
Other details: Requires consistently moist soil; do not let dry out between waterings This plant is attractive to bees, butterflies and/or birds
Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline)
Patent Information: Non-patented
Propagation Methods: By dividing rhizomes, tubers, corms or bulbs (including offsets)
Seed Collecting: N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed
I have a blue & purple "themed" flower garden, and saw monkshood at my local nursery in 2011- the fabulous intense blue/violet flowers had a definite WOW factor. Received conflicting info as to where to plant, so at first located it in an area where it got the morning sun-got very leggy with not much of a flower stalk the first year. Relocated to a full sun spot in Spring of 2012, and what a difference; plants did get quite tall, over 7 ft, but the top 2 ft were nothing but flowers, and bloomed from mid-Sept to mid-Oct. The plant did tolerate the transplant very well. Did it in early Spring when new shoots were about 6"-just made sure it was well watered for the first week
On Jul 21, 2012, Bazuhi from Downers Grove, IL (Zone 5a) wrote:
I had gotten these plants in 2008 from someone on Craigslist thinking I was getting Delphinium plants. Of course when they bloomed in fall I figured out it was the wrong plant.
This plant has done very well where it was planted getting nice green leaves and sending up shoots of flowers in the fall over 6ft tall. The flowers are kinda pretty as long as the stalks stay up and they were displayed in groups otherwise kinda eh. With this plant I do recommend staking the flower stalks. The flower bed this plant was growing in really needed to be cleaned up due to the over growth of the Bee Balm, the garden Phlox that have gone wild (and no longer were or represented the original plant) and other issues in this bed. I with careful consideration decided to remove these plants from the flower bed with no relocation being done, they ended up in a trash heap. Several deciding factors played a role in this:
1)The whole plant is extremely toxic to pets and I had obtained 2 small breed puppies and did not want to take any chances since the plant was growing out of its designated fenced in area.
2)The plant just got way to tall for where it was located with the foliage getting3-4 feet and the flower spikes getting to 6ft
3)I wasnt all the impressed with the flowers to make it worth my while
4)The flower stalks needed staking and I am to lazy to do all that for a plant I am not that impressed with.
So I have officially removed this plant this year(2012) and am no longer growing it.
On Mar 6, 2007, berrygirl from Braselton, GA (Zone 7b) wrote:
Arendsii produces amethyst-blue hooded flowers which are great for cut flowers. Stately upright clump has glossy deeply-cut leaves. POISONOUS!
This plant has been said to grow in the following regions:
, Downers Grove, Illinois Plainfield, Illinois Carmel, Indiana Macy, Indiana Woolwich, Maine Jamaica Plain, Massachusetts Lexington, Massachusetts Stephenson, Michigan Brewster, Minnesota Ely, Minnesota Golden Valley, Minnesota St Paul, Minnesota Bozeman, Montana Flanders, New Jersey Buffalo, New York Gates-north Gates, New York Sidney, Ohio East Norriton, Pennsylvania Laflin, Pennsylvania Lexington, Virginia Sandston, Virginia Alger, Washington De Pere, Wisconsin