Bull thistle (Cirsium vulgare), also sometimes called spear thistle, Fuller's thistle, and lance-leafed thistle, is a biennial weed found in ... Unlike similar thistles like Canadian thistle ...

Plus, it's prickly to the touch, so it's an invasive weed you'll want to get rid of especially if you have children and pets. Thankfully, you can eradicate thistle weeds with a simple but ...