FENNEL SEED Fennel (Foeniculum vulgare) is a plant species. It is a highly aromatic and flavorful herb with culinary and medicinal uses. Fennel is widely cultivated. Fennel is highly beneficial in digestive disorders. This is helpful in treating indigestion, biliousness, flatulence, constipation. Chewing its seeds after meals prevents foul breath, indigestion, constipation and vomiting.