Fennel, Foeniculum vulgare, is a perennial herb. It is erect, glaucous green, and grows to heights of up to 2.5 metres (8 ft), with hollow stems. A raw fennel bulb (235 g) consists of 212 g of water, 2.91 g of protein, 0.47 g of fat, and 17.2 g of carbohydrate (including 7.28 g of dietary fiber and 9.24 g of sugars), providing a total of 72.8 Calories (kcal) of energy. The 235g bulb provides 115 mg of calcium, 1.72 mg of iron, 40 mg of magnesium, 188 mg of phosphorus, 973 mg of potassium, 122 mg of sodium, trace amounts of zinc, copper, and selenium, 28.2 mg of vitamin C, as well as choline, several B vitamins, folate, beta-carotene, lutein, zeaxanthin, vitamin E, and vitamin K. The vitamin and mineral content in fennel contributes to building and maintaining bone structure and strength