Check the listing for details. Cinquefoil Herb ( Five Fingers Grass ) 1 oz.. Condition: New. Listed at 11.11 USD. Cinquefoil Herb - 1 oz. ( 28g) - Resealable Bag. Cinquefoil was a popular ingredient in magical potions during the Middle Ages, and thought to be especially powerful as a love potion. Alleged spell to remove a curse : boil one tablespoonful of Cinquefoil herb in one quart of water for five minutes.