Burdock

This biennial forms a rosette of large broad leaves in its first year and then has thistle-like flowers on a tall stalk the next. The flower bracts end in hooked bristles such that if you were feeling in a particularly childish mood then you might, for example, accidentally stick them on the back of someone’s jumper. It’s the root that is used for the flavouring in the drink Dandelion and Burdock. Also, there are a couple of species that are difficult to tell apart (even for me), which is why it says Arctium species for the Latin name.