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Cirsium discolor (Muhl. ex Willd.) Spreng.
Synonym(s): Carduus discolor
USDA Symbol: cidi
USDA Native Status: L48 (N), CAN (N)
Field Thistle is a member of the aster family (family Asteraceae) which includes herbs, sometimes shrubs or vines, rarely trees, with simple or compound, alternate or opposite leaves. Flowers small, but organized into larger heads resembling a single, radially symmetrical flower cupped by a ring of green bracts. Flower-like heads: tiny, radially symmetrical central flowers form the disk; larger flowers around the edge, the rays, strap-shaped and resembling petals; however, all flowers in one had may be disk flowers or rays.
Plant CharacteristicsDuration: Biennial Habit: Herb Size Notes:
Height 80-200 cm. Fruit:
Brown Size Class:
Bloom InformationBloom Color: Pink , Purple
Bloom Time: Jun , Jul , Aug , Sep
, WV Canada: MB
Growing ConditionsLight Requirement: Sun
Soil Moisture: Dry
BenefitUse Wildlife: Goldfinches are fond of this thistle seed.
Conspicuous Flowers: yes
Larval Host: Painted Lady
Butterflies and Moths of North America (BAMONA)
is a larval host and/or nectar source for:
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Mt. Cuba Center
- Hockessin, DE
Record Last Modified: 2012-12-07
Research By: TWC Staff