If left to their own devices, they will eventually grow into tall ... thistle (Cirsium vulgare), also sometimes called spear thistle, Fuller's thistle, and lance-leafed thistle, is a biennial weed ...

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As sow thistle can grow up to 1 m tall, it can be quite a competitive weed. It gets its common name from being an attractive food for pigs, and for having a vague similarity in appearance while young ...