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Sow Thistle (Sonchus oleraceus), a quick growing annual daisy with succulent stems and leave that exude a milky sap when cut. The leaves have deep lobes that are sharply toothed but not spiny. Sow thistle can grow to 15m tall, occurs in many parts of the world and is considered to be a weed that grows strongly enough to compete with cultivated crops. The stems often develop a purplish tint in winter.