Description: The most handsome of the Epilobium species; occurring on lowland river and lake-sides in abundance across Northern Ireland. It usually has purple flowers, but populations with a very high proportion of white flowers occur at some sites e.g. in Antrim Bay, Lough Neagh.

Unlike other Epilobium species, it rarely hybridizes: there are no reports of hybrids from Northern Ireland, except for two records of the cross with the small-flowered willowherb (E. parviflorum).

All names: Epilobium hirsutum L.

Distribution Map from NBN: Epilobium hirsutum at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Epilobium hirsutum at iNaturalist World Species Observations database.