Fennel is a licorice flavored, feathery, aromatic herb. It grows to be several feet tall with umbels of small, yellow flowers that look very similar to a dill plant. This digestive herb relieves heartburn, gas, colic, and an upset stomach. The seeds can be chewed to sweeten breath and help a toothache, and a gargle will relieve a sore throat. Fennel also increases breast milk. To use as a compress, put crushed seeds in hot water for relief of swollen, tender, nursing breasts.