Sea Thistle, Japanese Thistle, Plumed Thistle
Cirsium japonicum

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

Category:

Perennials

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us

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

This plant is resistant to deer

Other details:

May be a noxious weed or invasive

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

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds

Regional

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

Brighton, Massachusetts

Wallkill, New York

Gardeners' Notes:

0
positives
2
neutrals
0
negatives
RatingContent
Neutral

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

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.