Oenotherra Biennis To purchase Oenotherra Biennis and other homeopathic remedies online, please click the button above. Remedy info unavailable. Oenotherra Biennis is available to buy through our online shop from WHP in USA, Boiron in USA, Boiron in Canada, Weleda in UK (not for export), by clicking the red 'View Purchase Options' button. Alternative names, keywords, and common mis-spellings Oenothera Biennis