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Cirsium vulgare (spear thistle) is listed in the United States (where as a non-native invasive species it has been renamed "bull thistle") as a noxious weed in nine states. [6] Some species in particular are cultivated in gardens and wildflower plantings for their aesthetic value and/or to support pollinators such as bees and butterflies.
Spear thistle is designated an "injurious weed" under the UK Weeds Act 1959, [19] and a noxious weed in Australia [18] [20] [21] and in nine US states. [22] Spread is only by seed, not by root fragments as in the related creeping thistle C. arvense. It is best cleared from land by hoeing and deep cutting of the taproot before seeds mature ...
Carduus nutans is a monocarpic herb and is classified as a biennial thistle, though it can have varying phenology depending on climate and habitat. [5] Mature plants can reach 2.7 m (9 ft) in height with multi-branched stems.
Creeping thistle is a herbaceous perennial plant growing up to 150 cm, forming extensive clonal colonies from thickened roots that send up numerous erect shoots during the growing season. [14] It is a ruderal species. [15] Given its adaptive nature, Cirsium arvense is one of the worst invasive weeds worldwide. Through comparison of its genetic ...
Common names include Texas thistle, Texas purple thistle or southern thistle. [2] The species is native to northern Mexico ( Coahuila , Durango , Nuevo León , San Luis Potosí , Tamaulipas ) and the southern Great Plains of the south-central United States (primarily Texas , Oklahoma , and eastern New Mexico with additional populations in ...
Cirsium horridulum, called bristly thistle, purple thistle, or yellow thistle is a North American species of plants in the tribe Cardueae within the family Asteraceae. It is an annual or biennial . [ 2 ]
Cirsium discolor, the field thistle, [2] is a North American species of plants in the tribe Cardueae within the family Asteraceae. It is native to thirty-three states in the United States as well four Canadian provinces. [3] It occurs across much of eastern and central Canada as well as eastern and central United States.
Carduus pycnocephalus, with common names including Italian thistle, Italian plumeless thistle, and Plymouth thistle, [1] is a species of thistle. It is native to the Mediterranean region in southern Europe, North Africa , and Western Asia ; Eastern Europe and the Caucasus ; and the Indian Subcontinent .