Germaine Cousin-Zermatten (22 April 1925 â 4 January 2026) was a Swiss herbalist and author who, following personal research aimed to compile an ancestral knowledge only transmitted orally, wrote several books devoted to the phytotherapeutic properties of medicinal plants located in the Val dâÂÂHérens region. She died on 4 January 2026, at the age of 100.