Sonchus oleraceus
Common Name(s):
  • Annual sow thistle, spiny-leaved sow thistle, spiny milk thistle, prickly sow thistle, sharp-fringed sow thistle
Origin: (Is it introduced?...from cultivation or accidentally,invasive,native)
  • This weed isn't native it's introduced from Europe
Identification: (Characteristics/traits that will help anyone identify your weed)
  • Leaves are deeply lobed and basal leaves end with a large, pointed segmet
  • Mature plants are 0.1-1.0 meters tall, and the single stems are erect and branched only near the top
Characteristics: (Why is it a weed?What makes your weed successful? What gives it a competitve advantage? How does it spread? Be thorough... how plants adapt and survive in their environment are one of the things that make them interesting.)
  • My weed is a weed because it is common in cultivated crops, grain fields, and orchards.
  • This weed is also a host to aphids, several viral diseases, and nematodes.
  • It grows in a wide range of environments, but does best on fertile, moist soils in full sunlight
Habitat: (Where does it live? Where would it be found in B.C.?)
  • In B.C. this weed is common in the province's southern coastal regions but its present in all agricultural reporting regions
  • It also occurs in all Canadian provinces and throughout the northern U.S.
Control/ eradication recommendations: (Use the principles of IPM. Include at least one cultural, one biological and one chemical control method as described in the resources you have accessed. Be specific.)
References: (at least 2)
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