Any plant with three leaves was revered in the Middle Ages as a symbol of the Trinity. A four-leaved cover was especially lucky as the extra leaf was supposed to impart the gift of second sight.
Red clover was used to make a cough mixture by adding the red blossoms into a boiling mixture of honey and water. A skin lotion could be made by infusing both flowers and leaves and used to treat skin rashes.
White clover was used to aid the rotation of crops every four years a clover crop was grown and plough back into the soil thus enriching the soil.