It is a perennial, with a tap root like the Dandelion. The stems are 2 to 3 feet high, the lateral branches numerous and spreading, given off at a very considerable angle from the central stem, so that the general effect of the plant, though spreading, is not rich and full, as the branches stretch out some distance in each direction and are but sparsely clothed with leaves of any considerable size. The general aspect of the plant is somewhat stiff and angular.
The lower leaves of the plant are large and spreading - thickly covered with hairs, something like the form of the Dandelion leaf, except that the numerous lateral segments or lobes are in general direction about at a right angle with the central stem, instead of pointing downwards, as in similar portions of the leaf of the Dandelion. The terminal lobe is larger and all the segments are coarsely toothed. The upper leaves are very much smaller and less divided, their bases clasping the stems.

The flowerheads are numerous, placed in the axils of the stem-leaves, generally in clusters of two or three. When fully expanded, the blooms are rather large and of a delicate tint of blue: the colour is said to specially appeal to the humble bee. They are in blossom from July to September. However sunny the day, by the early afternoon every bloom is closed, its petal-rays drawing together.
Uses---The leaves are used in salads, for which they are much superior to Dandelion. They may be cut and used from young plants, but are generally blanched, as the unblanched leaves are bitter. This forced foliage is termed by the French Barbe de Capucin and forms a favourite winter salad, much eaten in France and Belgium. A particularly fine strain is known as Witloof, in Belgium, where smallholders make a great feature of this crop and excel in its cultivation. The young blanched heads also form a good vegetable for cooking, similar to Sea Kale.

Enormous quantities of the plant are cultivated on the Continent, to supply the grocer with the ground Chicory which forms an ingredient or adulteration to coffee. In Belgium, Chicory is sometimes even used as a drink without admixture of coffee. For this purpose, the thick cultivated root is sliced kiln-dried, roasted and then ground. It differs from coffee in the absence of volatile oil, rich aromatic flavour, caffeine and caffeotannic acid, and in the presence of a large amount of ash, including silica. When roasted, it yields 45 to 65 per cent of soluble extractive matter. Roasted Coffee yields only 21 to 25 per cent of soluble extract, this difference affording a means of approximately determining the amount of Chicory in a mixture.

When infused, Chicory gives to coffee a bitterish taste and a dark colour. French writers say it is contra-stimulante, and serves to correct the excitation caused by the principles of coffee, and that it suits bilious subjects who suffer from habitual constipation, but is ill-adapted for persons whose vital energy soon flags, and that for lymphatic or bloodless persons its use should be avoided.
-from www.botanical.com