Thistle Weed

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Thistle weed, also called thistle, grows in clusters, spreads quickly and can be difficult to control. Agriculturists typically take measures to prevent growth of thistle weed. It is the common name of a group of flowering plants characterized by leaves with sharp prickles on the margins
Thistle weed grows best after cool, wet summers and falls. They are typically found in pastures, range land and forests. Depending on the specific species, thistle weed can grow to be 1 to 4 feet tall. They typically grow purple or white flowers.
Depending on the species, thistle weed is either biennial or perennial. Biennial thistle weed requires two years to complete its life cycle. Perennial thistle can survive for many growing seasons.