Medicinal use : 

The dandelion is a commonly used herbal remedy. It is especially effective and valuable as a diuretic because it contains high levels of potassium salts and therefore can replace the potassium that is lost from the body when diuretics are used. All parts of the plant, but especially the root, are slightly aperient, cholagogue, depurative, strongly diuretic, hepatic, laxative, stomachic and tonic. The root is also experimentally cholagogue, hypoglycaemic and a weak antibiotic against yeast infections. The dried root has a weaker action. The roots can be used fresh or dried and should be harvested in the autumn when 2 years old. The leaves are harvested in the spring when the plant is in flower and can be dried for later use. A tea can be made from the leaves or, more commonly, from the roots. The plant is used internally in the treatment of gall bladder and urinary disorders, gallstones, jaundice, cirrhosis, dyspepsia with constipation, oedema associated with high blood pressure and heart weakness, chronic joint and skin complaints, gout, eczema and acne. The plant has an antibacterial action, inhibiting the growth of Staphylococcus aureus, Pneumococci, Meningococci, Bacillus dysenteriae, B. typhi, C. diphtheriae, Proteus etc. The latex contained in the plant sap can be used to remove corns, warts and verrucae. The latex has a specific action on inflammations of the gall bladder and is also believed to remove stones in the liver. A tea made from the leaves is laxative.

Edible parts : 

Leaves - raw or cooked. When used in salads, they are rather bitter, though less so in the winter. Tender young leaves are considerably less bitter than older leaves.  A very nutritious food, 100g of the raw leaves contain about 2.7g. protein, 9.2g. carbohydrate, 187mg Calcium, 66mg phosphorus, 3.1mg iron, 76mg sodium, 397mg potassium, 36mg magnesium, 14000iu vitamin A, 0.19mg vitamin B1, 0.26mg vitamin B2, 35mg vitamin C. 

Root - raw or cooked. Bitter. A turnip-like flavor. 

Flowers - raw or cooked.  A rather bitter flavor, the unopened flower buds can be used in fritters and they can also be preserved in vinegar and used like capers. Both the leaves and the roots are used to flavor herbal beers and soft drinks such as "Dandelion and Burdock". The roots of 2 year old plants are harvested in the autumn, dried and roasted to make a very good coffee substitute. It is caffeine-free. A pleasant tea is made from the flowers. They are also used to make wine - all green parts should be removed when making wine to prevent a bitter flavor. The leaves and the roots can also be used to make tea.

Other uses : 

The flowers are an ingredient of "QR" herbal compost activator. This is a dried and powdered mixture of several herbs that can be added to a compost heap in order to speed up bacterial activity and thus shorten the time needed to make the compost. A liquid plant feed can be made from the root and leaves. A low quality latex, which can be used for making rubber, can be obtained from the roots of this plant. A magenta-brown dye is obtained from the root. The plant releases ethylene gas, this stunts the growth of nearby plants and causes premature ripening of fruits. A distilled water made from the ligules (thin appendages at the base of the leaf blades) is used cosmetically to clear the skin and is particularly effective in fading freckles