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PlantFiles: Sea Thistle, Japanese Thistle, Plumed Thistle
Cirsium japonicum

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Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Cirsium (SIR-see-um) (Info)
Species: japonicum (juh-PON-ih-kum) (Info)

10 members have or want this plant for trade.

Category:
Perennials

Height:
36-48 in. (90-120 cm)

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

Hardiness:
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)

Sun Exposure:
Full Sun

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

Bloom Color:
Red
Purple
White/Near White

Bloom Time:
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall

Foliage:
Grown for foliage
Herbaceous

Other details:
May be a noxious weed or invasive
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater
Self-sows freely; deadhead if you do not want volunteer seedlings next season
This plant is resistant to deer

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:
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds

Click thumbnail
to view:

By poppysue
Thumbnail #1 of Cirsium japonicum by poppysue

Profile:

No positives
2 neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Neutral ma1550 On Jul 3, 2011, ma1550 from Brighton, MA wrote:

I have a similar plant that I've been trying to identify -- the flowers are exactly as they appear here (color, shape, bloom) however, the foliage is softer (not coarse, more fernlike) -- any ideas? My plant diary lists it as Centranthum Rose Thistle but can't seem to find a plant connected to that name. Thanks.

Neutral dmj1218 On May 8, 2006, dmj1218 from west Houston, TX (Zone 9a) wrote:

A short-lived, native Japanese perennial that flowers in the first year, like an annual. The 1"-2" "thistle-like" flowers are deep magenta and bloom singly or in small clusters above the foliage. The prickly leaves have spiny edges.

Regional...

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

Brighton, Massachusetts
Wallkill, New York



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