These miniature, pansy-like flowers in violet, yellow, and white may look sweet and innocent, but don’t be fooled. In Greek and Roman mythology, they were basically the original love potion. Cupid’s arrow allegedly struck one, giving it the power to make people fall hopelessly in love. Shakespeare even used it in A Midsummer Night’s Dream, where a few drops of Heartsease juice had people swooning over the first thing they saw.