Information on Hemp-agrimony

Common Name: Hemp-agrimony
Scientific Name: Eupatorium cannabinum
Irish Name: Cnáib uisce
Family Group: Asteraceae
Distribution: View Map (Courtesy of the BSBI)
Flowering Period

Click for list of all flowering by month
Hemp-agrimony is not easily confused with other wild plants on this web site.

So much loved by butterflies and bees, this tall, hairy perennial can be found throughout Ireland by rivers and pools, in ditches and on sea-cliffs.  Sometimes reaching 150cm high, its robust reddish stems carry broad, flattish heads of numerous little dullish pink flowers (2-5mm across), each floret tubular with five short teeth and protruding stamens.  They blossom from July to late September, the fruit being a 1 seeded pappus.  The leaves are palmately lobed and in opposite pairs. This is a native plant which belongs to the family Asteraceae.    

I first recorded this plant growing close to the beach at Beal Tra, Co Kerry in 1977 and photographed it in the Burren in 2003 and Gibletstown, Co Wexford in 2008.  .   

If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre

I was lucky enough to find Hemp-agrimony growing beside the sea at Hook Head in Co Wexford in 2007 and on it several Red Admirals, Small Tortoiseshells, Peacocks and Painted Ladies were feeding.