spiny annual sow thistle

With reduced tillage, the top There are three forms of the tall, dandelionlike noxious weed called the sow thistle: Sonchus arvensis, or perennial sow thistle; Sonchus oleraceus, or annual sow thistle; and Sonchus asper, the spiny annual sow thistle. The leaves are alternate with spiny and deeply lobed margins. Some authorities believe that populations of Clammy Sow-thistle (Sochus tenerrimus) found in Australia are actually one of these forms of Common Sow-thistle.Common Sow-thistle belongs to a group of mainly yellow-flowered daisies in the Tribe Lactuceae. Description Sonchus oleraceus, or Sowthistle, is a genus of annual herbs, considered a winter and summer weed, and includes several species that are common in nurseries and landscapes. The leaves are alternate with spiny and deeply lobed margins. The stems are hollow and contain hair on only the lower portion. The stems only branch in the inflorescence. An annual that may reach as much as 6 feet in height with bluish-green leaves and stems that emit a milky sap when cut. The leaves of spiny sowthistle have. The root of spiny sowthistle is a taproot. Lower leaves are petiolate while the upper leaves are sessile. The leaves are bluish-green, simple, lanceolate, with wavy and sometimes lobed margins, covered in spines on both the margins and beneath. Figure 2. It is found throughout the United States. The leaves have very prickly margins that initially develop as a basal rosette and then occur alternately along the flowering stem, the bluish-green color of the leaves, and the yellow flowers with a ‘puff-ball’ seedhead are all characteristics that help in the identification of spiny sowthistle. It is also found in gardens, on roadsides, waste places and other disturbed … Annual sowthistle is a widespread winter or summer annual broadleaf plant. They then alternate on stems. The leaves form basal and are deeply lobed. This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Clemson, SC. Also, the leaf margins of spiny sowthistle are much more spiny or prickly than those of annual sowthistle. Spiny sowthistle (Sonchus asper) is a summer annual weed with a basal rosette and an upright flowering stem. Spiny milk-thistle’s close relative smooth sow-thistle (S. oleraceus) has similar demands with regards to habitat, so the two species can grow close to and even right next to each other. Sows thistles. Common Sow-thistle can differ in leaf shape and overall appearance. An annual that has bluish-green leaves and stems that emit a milky sap when cut. The leaves form basal and are deeply lobed. Spiny Sowthistle (Sonchus asper) is very similar in appearance, however this species has rounded lobes that clasp the stem whereas annual sowthistle has distinctly pointed lobes. It can also be confused with Canada thistle ( Cirsium arvense ), bull thistle ( Cirsium vulgare ), and Scotch thistle ( Onopordum acanthium ). The stems are erect, 1-4 ft. high, hollow, and glabrous. Prickly sow-thistle is a troublesome annual or overwintering weed common on arable land. The root system consists of a stout taproot. The leaves of perennial sowthistle are also not as deeply lobed as annual sow-thistle. Spiny sow thistle has a taproot. Both the leaves and stems contain a milky solution. Habitat: Spiny annual sow-thistle occurs throughout Ontario in waste places, along fence lines, roadsides, around buildings and occasionally in gardens. Reproducing by seed and from buds on widely spreading, creamy white, brittle, underground roots. REMEMBER: THE LABEL IS THE LAW!  Always read the pesticide label before using. The species can overlap the winter and summer annual categories. 21 September, 2017. Next, make up a marinade from the remainder of the first group of ingredients, using a splash of soy sauce, slugs of water and wine, seasoning and pinches of corn flour and sugar. Sonchus asper is an annual or biennial herb sometimes reaching a height of 200 cm. Leaves are lanceolate to oblanceolate in shape, hairless and dark green in color with pale white to purple veins. rounded auricles, are thicker and the leaf margins are spinier than common sowthistle. Spiny sowthistle has yellow flowers that appear in late spring, and the leaves and stems emit a milky-white latex when crushed. The seeds of spiny sowthistle are broader and are less wrinkled. All biennial thistles considered noxious are native to Europe or Eurasia, and were introduced into North America as seed contaminants. The upper leaves are less lobed but have spiny edges. Sonchus asper is an annual herb considered native to Europe, Africa and Asia that has … AgriLife Extension's online Bookstore offers educational information and resources related to our many areas of expertise and programming; from agriculture, horticulture, and natural resources to nutrition, wellness for families and youth, and much more. It does not invade pastures because it is eaten by livestock. the similar spiny sowthistle (Sonchus asper), but can be distinguished by its leaves and seeds. The main difference between the two is that the annual sow thistle has much smaller flowers (less than 2.5 cm across) than the perennial sow thistle. The plant will germinate in spring or in fall, becoming a … Sonchus oleraceus is an annual herb, upto 4 ft. in height. Flower heads are numerous, yellow, and appear in corymbs. 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