Clover

Sweet clover (Melilotus officinalis) grew abundantly across European meadows and was valued in folk medicine long before it entered perfumery. The plant's distinctive sweet scent develops as it cures — a process that releases coumarin through enzymatic reaction. In 1823, French pharmacist Auguste Vogel isolated coumarin from sweet clover seeds, marking the first identification of this now-iconic fragrance molecule. This discovery shaped the trajectory of 19th-century perfumery: once chemists understood coumarin's source, they could eventually synthesise it in 1868, enabling its widespread use in products from toiletries to tobacco. Today, while natural clover absolute appears in fine fragrances as a niche ingredient, coumarin itself — whether from tonka, clover, or laboratory synthesis — remains one of the most encountered aroma molecules in the industry.