Common Sowthistle Invasive Plant Information


Common Sowthistle has been reported in the following 51 states:

Alaska, Arizona, Colorado, Connecticut, District Of Columbia, Georgia, Idaho, Illinois, Indiana, Kansas, Kentucky, Maryland, Minnesota, Mississippi, Montana, Nebraska, New Hampshire, New Mexico, North Carolina, Oklahoma, Pennsylvania, South Carolina, South Dakota, Utah, Vermont, Wisconsin, Wyoming, Oregon, West Virginia, Alabama, Arkansas, California, Delaware, Florida, Hawaii, Iowa, Louisiana, Maine, Massachusetts, Michigan, Missouri, Nevada, New Jersey, New York, North Dakota, Ohio, Rhode Island, Tennessee, Texas, Virginia, Washington


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Information about Common Sowthistle:


The following information is licensed as Creative Commons content from Wikipedia and the USDA.
More information about Common Sowthistle may be found here, or from the US Department of Agriculture.

The Latin name Sonchus refers to the hollow stem, while oleraceus refers to its good taste. The common name sow thistle refers to its attractiveness to swine, and the similarity of the leaf to younger thistle plants. The common name hare's thistle refers to its purported beneficial effects on hare and rabbits.Sonchus oleraceus is native to Europe and western Asia.Sonchus oleraceus, with many common names including common sowthistle,sow thistle,smooth sow thistle, annual sow thistle, hare's colwort, hare's thistle, milky tassel, milk thistle,soft thistle, or swinies, is a plant in the dandelion tribe within the daisy family.

Prefers full sun, and can tolerate most soil conditions. The flowers are hermaphroditic, and common pollinators include bees and flies. It spreads by seeds being carried by wind or water.
This plant is considered an invasive species in many parts of the world, where it is found mostly in disturbed areas. In Australia it is a common and widespread invasive species, with large infestations a serious problem in crops.
Leaves are eaten as salad greens or cooked like spinach. This is one of the species used in Chinese cuisine as kŭcài (; lit. bitter vegetable). Blanching or boiling removes bitter flavour.
Nutritional analysis reveals 30 - 40 mg of vitamin C per 100g, 1.2% protein, 0.3% fat, 2.4% carbohydrate. Leaf dry weight analysis per 100g (likely to vary with growing conditions) shows: 45g Carbohydrate, 28g protein, 22g ash, 5.9g fibre, 4.5g fat; in all, providing 265 calories.
Minerals Calcium: 1500 mg Phosphorus: 500 mg Iron: 45.6 mg Magnesium: 0 mg Sodium: 0 mg Potassium: 0 mg Zinc: 0 mg;
Vitamins A: 35 mg Thiamine (B1): 1.5 mg Riboflavin (B2): 5 mg Niacin: 5 mg B6: 0 mg C: 60 mg
Sonchus oleraceus has a variety of uses in herbalism. It also has been ascribed medicinal qualities similar to dandelion and succory.
This plant can often be controlled by mowing, because it does not regrow from root fragments. Attempts at weed control by herbicide, to the neglect of other methods, may have led to proliferation of this species in some environments.


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Reported Urban
Infected Regions:

Anchorage, AK