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Cirsium crassicaule
Slough thistle is a tall annual or biennial thistle endemic to freshwater wetlands of California's San Joaquin Valley, found in only a few sites. It grows best in moist, wetland-type conditions with full sun.
Cirsium crassicaule is a species of thistle known by the common name slough thistle. It is endemic to the San Joaquin Valley of California, where it is known primarily from freshwater wetlands. It has been found in only a few locations in Kern, Kings, and San Joaquin Counties.
Cirsium crassicaule is an annual or biennial herb known to reach 300 cm (10 feet) in height. The thick stem is hollow and may be nearly 10 centimeters (4 inches) wide at the base. It is coated in hairs and cobwebby fibers. The woolly, webby, spiny leaves are deeply cut into many lobes, the lobes often lined with teeth. The longest leaves near the base of the plant may be 70 centimeters (28 inches) long.
Dwarf Thistle · Tall thistle · Rose thistle · Franciscan thistle · Alishan Thistle · Arizona thistle · Creeping Thistle · Barneby's thistle · Cirsium boninense · Cirsium brachycephalum · Palouse thistle · Clustered thistle
Text excerpted from the Wikipedia article Cirsium crassicaule by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
