ers are a different color. thistle and bull thistle have been listed as noxious weeds only in New Mexico. Native to west-ern Asia and Europe and was probably intro-duced as a seed contaminant. Light infestations of perennial sow thistle cause yield losses in field … Although grazing animals (and butterflies) actually prefer the Sonchus to grass farmers rant about the plant because it’s a weed amongst their crop. Perennial sow thistle typically occurs in patches. Determine whether you have perennial or annual sow thistle in your yard. The leaves are also great to use as an antioxidant. 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.It is native to Europe and western Asia.. Its specific epithet oleraceus means "vegetable/herbal". Perennial sow thistle can slow harvest. Some perennials are considered “tender perennials’ and won’t survive a cold winter; those are the vegetables most of us plant fresh each year, treating them as an annual. Annuals vs. perennials. Perennial Sow Thistle is a perennial that is commonly confused with Annual Sow-Thistle and Prickly Lettuce. Threshold/Yield Loss. Examine the leaves of the plant: perennial sow thistle leaves are alternate and have toothed margins, while annual sow thistle leaves fully clasp the main stem, with either rounded or flat spiny lobes. Both Rough Sow-thistle and Smooth Sow-thistle are similar, but Perennial Sow-thistle has larger, more showy and deeper yellow flowers. Common sow thistle is in the Compositae (Asteraceae) family. Green matter in grain can increase drying costs and dockage. An annual plant grows for one season and then it’s done. This field guide serves as the U.S. Forest Service’s recommendations for management of annual and biennial invasive thistles in forests, woodlands, and rangelands associated with its Southwestern Region. Recognizable features: https://www.minnesotawildflowers.info/flower/perennial-sowthistle Perennial weeds grow from root stalks year after year. As for the sow thistle’s botanical name: Sonchus is the ancient Greek name for the plant and means “hollow” referring to the plant’s hollow stem, a point of identification. Smooth Sow-thistle has pointed leaf auricles and Rough Sow-thistle has prickly leaves. Annual sow thistle is very similar but reproduces only by seed and its flowers are smaller. This is a nutritious plant that contains several minerals (calcium, magnesium, iron, phosphorus, sodium, potassium and zinc) and vitamins ( A, B1, B2, B3, B6, & C). A perennial plant grows for more than one season. Effects On Crop Quality. The Southwestern Classification: Noxious Weed. 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