Flower of Salt from Castro Marim After the end of the harvest, the crystallization process of Traditional Salt and manual collection of Flower of Salt – from June to September, the remaining waters in the salt pans – mother water – are collected. These waters, with a high density of mineral salts, have a special composition, highly concentrated in mineral compounds that are difficult to precipitate, such as magnesium sulfate and chloride or potassium chloride, and a lower sodium content compared to the extracted salt and flower of salt.