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Height: 12-18 in. (30-45 cm) 18-24 in. (45-60 cm) 24-36 in. (60-90 cm) 36-48 in. (90-120 cm) 4-6 ft. (1.2-1.8 m) 6-8 ft. (1.8-2.4 m)
Spacing: 24-36 in. (60-90 cm)
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) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F) USDA Zone 10a: to -1.1 °C (30 °F) USDA Zone 10b: to 1.7 °C (35 °F) USDA Zone 11: above 4.5 °C (40 °F)
Sun Exposure: Full Sun
Danger: Plant has spines or sharp edges; use extreme caution when handling
Bloom Color: Pink Magenta (Pink-Purple)
Bloom Time: Mid Summer Late Summer/Early Fall Mid Fall
Foliage: Herbaceous
Other details: May be a noxious weed or invasive Drought-tolerant; suitable for xeriscaping Average Water Needs; Water regularly; do not overwater Self-sows freely; deadhead if you do not want volunteer seedlings next season
Propagation Methods: From seed; direct sow outdoors in fall From seed; winter sow in vented containers, coldframe or unheated greenhouse From seed; stratify if sowing indoors From seed; sow indoors before last frost From seed; direct sow after last frost
Seed Collecting: N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed
On Nov 3, 2007, distantkin from Saint Cloud, MN (Zone 4b) wrote:
On Minnesota DNR invasive list
"Ecological Threat:
It generally does not pose a threat to high quality areas. It colonizes primarily in disturbed areas.
Musk thistle is distasteful to grazing animals, giving the thistle a competitive edge.
It grows best in disturbed areas such as pastures, roadsides, and ditch banks, but also in hayfields and disturbed prairies.
A native of western Europe it was introduced to the U.S. in the early 1800s, and is declared an agricultural pest.
Musk thistle and Plumeless thistle are on the MDA Prohibited noxious weed list in Minnesota. "
On Apr 1, 2007, Joan from Belfield, ND (Zone 4a) wrote:
This plant is listed on the North Dakota invasive/troublesome list and this information is being distributed in a guide developed by the ND Weed Control Association and other agencies.
Plant Features:
Biennial or winter annual, up to 7 feet tall
First year rosettes up to 2 feet wide
Rose to violet flowers up to 3 inches wide
Flower heads droop or nod
Bracts on flower heads coarse, pinecone-like
Leaf edges spiny
Leaf tips and leaf lobes spine-tipped
Leaves dark green with a light midrib
Fleshy taproot, hollow near ground surface
Branching stems with spiny wings
Distribution
Widespread invasive found on disturbed areas, rangeland, pastures, hay land, and road sides. Most abundant in Northeast ND
Interesting Facts:
Spreads by seeds only
Seeds remain viable up to 10 years
Also known as nodding thistle
On Aug 30, 2004, Windy from Belleville , IL (Zone 6b) wrote:
I was driving a back road one day and noticed a government vehicle driving slowly in the opposite direction. There was a man riding shot gun spraying these things that grew on the side of the road.
My property was once a cattle grazing land and I get these growing in my lawn. If given the chance they will creep into a flower bed or fence perimeter. I try to pull them from the root with heavy rubber gloves on. They have a long tap root.
Unfortunately, bees and butterflies love these guys.
