Photo by Melody

PlantFiles: Wavyleaf Thistle, Wavy-Leafed Thistle
Cirsium undulatum

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Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Cirsium (SIR-see-um) (Info)
Species: undulatum (un-dew-LAY-tum) (Info)

Synonym:Cirsium undulatum var. undulatum
Synonym:Carduus undulatus
Synonym:Carduus helleri
Synonym:Cirsium megacephalum
Synonym:Cnicus undulatus var. megacephalus

One member has or wants this plant for trade.

Category:
Biennials
Perennials

Height:
24-36 in. (60-90 cm)

Spacing:
18-24 in. (45-60 cm)

Hardiness:
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)

Sun Exposure:
Full Sun

Danger:
Plant has spines or sharp edges; use extreme caution when handling

Bloom Color:
Magenta (Pink-Purple)

Bloom Time:
Late Summer/Early Fall
Mid Fall

Foliage:
Herbaceous

Other details:
May be a noxious weed or invasive
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater

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:
Unknown - Tell us

Propagation Methods:
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; sow indoors before last frost

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored

Click thumbnail
to view:

By kennedyh
Thumbnail #1 of Cirsium undulatum by kennedyh

By frostweed
Thumbnail #2 of Cirsium undulatum by frostweed

By frostweed
Thumbnail #3 of Cirsium undulatum by frostweed

By frostweed
Thumbnail #4 of Cirsium undulatum by frostweed

By frostweed
Thumbnail #5 of Cirsium undulatum by frostweed

By frostweed
Thumbnail #6 of Cirsium undulatum by frostweed

By Xenomorf
Thumbnail #7 of Cirsium undulatum by Xenomorf

There are a total of 14 photos.
Click here to view them all!

Profile:

1 positive
2 neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive KSBaptisia On Jul 31, 2008, KSBaptisia from Beatrice, NE (Zone 5b) wrote:

A very beautiful native thistle.

Neutral Xenomorf On Jul 4, 2007, Xenomorf from Valley of the Sun, AZ (Zone 9b) wrote:

Seen growing along the side of the road between Concho & Showlow, Arizona. Apache County, Highway 61, June 30th, mid Summer, zone 6b, elevation 6300 ft.

Neutral frostweed On May 3, 2007, frostweed from Josephine, Arlington, TX (Zone 8a) wrote:

Wavyleaf Thistle, Wavy-Leafed Thistle Cirsium undulatum is native to Texas and other Satates.

Regional...

This plant has been said to grow in the following regions:

Concho, Arizona
Beatrice, Nebraska
Roswell, New Mexico
Arlington, Texas



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