Bernard Castelein / Close up of leaves {Acorus calamus} Argonne, north-east France

Bernard Castelein / Sweet-flag {Acorus calamus} introduced from Turkey now naturalised in Europe by rivers

Will Watson / Ice-age pool in the Wye Valley with non-native Sweet Flag (Acorus calamus), tree reflections, Herefordshire, England, UK. May, 2021.

Linda Pitkin / Sweet-flag (Acorus calamus). Hampton Court, Richmond on Thames, England, UK. August.