You can make wine from the petals, or add them to salads. wine recipe here.
Make Coffee from the Roots, dried then slow roasted.
Mix with Burdock Root for traditional Dandelion and Burdock.
Eat the blanched (or plain if you like bitter) greens.
Cure your warts (tested and works) with the milky sap. Also reputed to work on skin tags and moles- will be testing on skin tags this year.
A tea from the leaves is strong diuretic, (pis en lit), but one that spares potassium, of which it is a good source. (That's generally a good thing, but beware if you have certain kidney diseases).
The root is Hepatic i.e. good for the liver - therefore according to Traditional Chinese Medicine, good for Depression.
The root is rich in vitamin A and so useful in skin prepartions. Try using the tea/coffee as a rinse.
Interesting article here lists it as good for Osteoporosis, Alzheimer’s, Bladder Infections, and Pneumonia, all accompanied by reasons why. E.g. the petals are rich in lecithin and choline, precursors to acetylcholine.
Im sure that the flowers could work as a pigment, after playing with them the other day I had very yellow hands. The roots make a red or purple dye.