Our rock rose grows wild on the plains of Almaden de la Plata outside Seville, Spain. In late summer, the leafy stems of the plant are sickle harvested and plunged into hot carbonated water. This mixture is then distilled to obtain a honeyed, amber resin - labdanum. The plant remains are used as biofuel. Traditionally, labdanum was taken from the coats of goats who grazed the rock rose-covered hillsides of Crete - but times have changed.