For more information, see Noxious Weed Lists and Laws or visit the website of the Washington State Noxious Weed Contro… Ask any butterfly! Scientific name: Eryngium castrense Family: Apiaceae (carrot) Habitat: vernal pools Size: plant 8 to 18 inches tall, flower 2 to 3 mm in the summer Fun facts: Plant has two different forms: when in water the leaves are hollow to carry air to the roots; later the leaves are solid and prickly like a thistle. It is sometimes confused with Sonchus sp., or sow-thistle, probably because they are both called thistles and have spiny leaves. The seeds of Cirsium can be sown in either autumn or after the last frost of spring. Purple flowers add richness and depth to any landscape design, be it a formal or informal type. About The Creeping thistle is our most common species of thistle and can be found on disturbed and cultivated ground, such as rough grassland, roadside verges and field edges from June to October. Common Sow-thistle can differ in leaf shape and overall appearance. Species - Field Sowthistle - Sonchus arvensis Field Sowthistle - Sonchus arvensis Other Names: Perennial Sow-thistle, Perennial Sowthistle, Corn Sow Thistle, Gutweed, Swine Thistle, Tree Sow Thistle Canada thistle (Cirsium arvense) is a root-creeping perennial. Philosophy. Field thistle is a member of the Asteraceae, the Sunflower family. Carduus crispus, the Welted Thistle, or Field Thistle, is one of the taller species. Its creeping roots enable it to quickly spread across an area, forming large colonies. It is an invasive weed native to Europe and Asia. Canada thistle (note that it's NOT 'Canadian' thistle) is in the family Asteraceae. Hembree, UC Cooperative Extension Fresno County. • Light green stems with white hairs, but they are without spines. Foliage Leaves are dark green and lanceolate to oblong-lanceolate. Canada thistle is native to Europe. Spreng.) If grown indoors first, then Cirsium takes about 2 to 3 weeks to germinate at a temperature of 70 to 75 degrees Fahrenheit (21 to 24 degrees Celsius). (7.6-30.5 cm) long, lance-shaped and very hairy. It was introduced to North America in the 1600s, probably in agricultural seed shipments and is now widespread throughout the United States and Canada. Cirsium arvense var. Thistle, Tall: Cirsium arvense: Thistle, Canada: Cirsium carolinianum: Thistle, Carolina: Cirsium discolor: Thistle, Field : Cirsium vulgare: Thistle, Bull: Claytonia caroliniana: Spring Beauty, Carolina: Claytonia virginica: Spring Beauty, Virginia: Clematis viorna: Leather Vasevine: Clematis virginiana: Virgin's Bower: Cleome spinosa: Spiderflower: Clethra acuminata: Summer-sweet Cirsium arvense var. Scotch thistle flower head. Biennial thistles, such as musk (Carduus nutans L.), plumeless (Carduus acanthoides L.) and bull thistle [Cirsium vulgare (Savi) Tenore], are not as difficult to control as the perennial thistle species, but spread rapidly and can become severe problems in some areas. Today at Longwood. The stem, 3 to 4 feet high, is erect, branched, continuously spinous-winged throughout. Synonyms (former Scientific Names): Cirsium setosum . Canada thistle is a perennial thistle that grows 1.5-5 ft. tall, and is distinguished from other thistles by its extensive lateral root system, dense clonal growth, an J.K. Hasey, UC Cooperative Extension Sutter and Yuba Counties. Life Cycle. Key characteristics Biology Impacts Control Further information Key characteristics. horridum . The generic name Cirsium is derived from the Greek word kirsos which means 'swollen vein' (Clark, 1998). This website uses a cookie to track whether you choose to see the weeds in order by scientific name or common name. In older manuals and guides, this family is called the Compositae because the 'flowers' are a composite of many flowers, often of different types. Cirsium discolor, Field Thistle. Field Thistle ( Cirsium discolor (Muhl. field thistle (Cirsium discolor) • Native, rare but very similar • Floral bracts enfold the flower heads that have slender golden spines. Common names refer to the attractiveness of the plant to hares, rabbits and pigs. The stem, 3 to 4 feet high, is erect, branched, continuously spinous-winged throughout. Gardens Open 10:00 am–6:00 pm. K.J. Biennial thistles spread only by seed (achenes) that are produced in great number by all the noxious species, ran… By David Taylor. integrifolium . Other names for this plant include: Common names: creeping thistle, field thistle, perennial thistle; Scientific names: Carduus arvensis; Cirsium incanum; Ecological threat: It invades undisturbed areas such as prairies, savannas, glades, dunes, streambanks, sedge meadows and forest openings. The Alabama Plant Atlas is a source of data for the distribution of plants within the state as well as taxonomic, conservation, invasive, and wetland information for each species. • Alternate leaves are quite spiny, pinnately lobed, and up to 9" long and 3" … ex Willd.) Scientific name: Cirsium arvense. Appearance Cirsium arvense, a rhizomatous perennial grows from 1-5 ft. (0.3-1.5 m) tall.Roots can grow deep into the ground. Planning to start a flower garden! Breea incana . Plants of this genus were used as an herbal remedy to relax swollen veins. Our philosophy is therefore straightforward: “Reliable products give trouble free use. Considered noxious under the BC Weed Control Act, Canada thistle is commonly found on roadsides, cultivated fields, pastures, logged forests, riverbanks, and other disturbed areas. Its flowers attract insects and its seeds feed birds. Common name: Yellow Star-thistle. A common plant of disturbed ground like roadside verges and field edges, the Spear thistle has purple, fluffy flower heads that appear in summer. The spiny, spreading, winged stems are up to 7 ft. (2.1 m) tall. The stems are winged, very branched and very spiny, giving the plant a candelabrum appearance (Figure 1A). How to Grow and Care. The entire Province/State is coloured, regardless of where in that Province/State it occurs. Herbaceous plants are also known as forbs or wildflowers . 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