It is generally considered indigenous to the shores of theMediterranean, but has become widely naturalised elsewhere.
Fennel is a perennial herb. It is erect, glaucous green, and grows to heights of up to 2,5 m, with hollow stems. The leaves grow up to 40 cm long; they are finely dissected, with the ultimate segments filiform, about 0,5 mm wide. The flowersare produced in terminal compound umbels 5–15 cm wide, each umbel section having 20–50 tiny yellow flowers on short pedicels. The fruit is a dryseed from 4–10 mm long, half as wide or less, and grooved.