“Hey, sweet pea” is an expression we’ve all grown up hearing. But few of us have actually spent time thinking about where this phrase actually came from. In the language of flowers, the sweet pea (Lathyrus odoratus) holds the symbolic meaning of blissful pleasure. Sweet peas, pois de senteur, are primarily known for their intensely sweet, honey-like fragrance and delicate, frilly, butterfly-shaped flowers in pastel shades.