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Cirsium oleraceum, the cabbage thistle [3] or Siberian thistle, is a species of thistle in the genus Cirsium within the family Asteraceae, native to central and eastern Europe and Asia, where it grows in wet lowland soils. [4] Cirsium oleraceum is a herbaceous perennial plant growing to 1.5 m tall, the stems unbranched or with only a very few ...
The cardoon (Cynara cardunculus / ˈ s ɪ n ər ə k ɑːr ˈ d ʌ n k j ʊ l ə s /), [2] [3] also called the artichoke thistle, is a thistle in the family Asteraceae. It is a naturally occurring species that also has many cultivated forms , including the globe artichoke .
The flowers are insect pollinated, and various thistle species are widely known as important food sources for butterflies, as well as bees. Goldfinches love to feed on this abundant thistle ...
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.
Cirsium palustre is a tall thistle which reaches up to 2 metres (7 ft) in height. The strong stems have few branches and are covered in small spines. In its first year the plant grows as a dense rosette, at first with narrow, entire leaves with spiny, dark purple edges; later, larger leaves are lobed.
It was rated in the top 10 for most nectar production (nectar per unit cover per year) in a UK plants survey conducted by the AgriLand project which is supported by the UK Insect Pollinators Initiative. [10] Marsh thistle, Cirsium palustre, was ranked in first place while this thistle was ranked in sixth place. It also was a top producer of ...
The leaves along the stem are alternate and measure up to 23 cm (9 in) long and 8 cm (3 in) wide. [4] Leaves vary in shape, with larger leaves generally lanceolate, and smaller leaves elliptic. They could be uncut to deeply pinnately lobed, varying from plant-to-plant and even on the same plant. [3]
Thomas Nuttall (1786-1859) described var. megacanthum as "one of the most terribly armed plants in the genus." [8] [9] Cirsium horridulum is a biennial herb up to 250 centimetres (100 in) tall, with a large taproot and fleshy side roots that sometimes sprout new shoots. Leaves are up to 40 centimetres (16 in) long with thick, sharp spines along ...