pfaf.org/user/Plant.aspx.../user/Plant.aspx

Young leaves are sometimes used as a spinach substitute. A nutritional analysis is available[218]. Flowers - raw or cooked. They can also be made into a kind of pickle or used as a purple dye for colouring foods such as preserved fruits and cooked vegetables. A nutritional analysis is available. Root - it is edible but very fibrous. Mucilaginous, without very much flavour