This is hemp agrimony (Eupatorium cannabinum) from the Asteraceae or daisy family
Well, that was a great week! Claire, FEARN, Anne and Fran and Bobby Freelove all got 15 out of `15 on identifying the plant families correctly, so well done to everyone. For those who also tried to identify the plants, both Anne and Fran and Bobby got 13 out of the 15 plants correct, though with common names there is a bit of room for negotiation – for example, I had plant 1 as spear thistle rather than milk thistle, and plant 13 as goat’s rue rather than bird vetch. If you can convince me that this is how you know Cirsium vulgare and Galego officinalis I will give you your points back :-).