Hemp agrimony / Byddon chwerw / Bedwen chwerw / Eupatorium cannabinum
Flowers July-September

| This tall plant, which can grow up to about 4ft, is sometimes confused with valerian. However, the leaves are quite a bit different, resembling those of cannabis, hence both the English and Latin names. The plant is fairly common in marshes and by rivers. I found this specimen in Cwm Darren, Caerphilly, growing in a marshy patch. |
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