According to the USDA Bulletin #8, "Composition of Foods" (Haytowitz and Matthews 1984), dandelions rank in the top 4 green vegetables in overall nutritional value. Minnich, in "Gardening for Better Nutrition" ranks them, out of all vegetables, including grains, seeds and greens, as tied for 9th best. According to these data, dandelions are nature's richest green vegetable source of beta-carotene, from which Vitamin A is created, and the third richest source of Vitamin A of all foods, after cod-liver oil and beef liver! They also are particularly rich in fiber, potassium, iron, calcium, magnesium, phosphorus and the B vitamins, thiamine and riboflavin, and are a good source of protein.
These figures represent only those published by the USDA. Studies in Russia and Eastern Europe by Gerasimova, Racz, Vogel, and Marei (Hobbs 1985) indicate that dandelion is also rich in micronutrients such as copper, cobalt, zinc, boron, and molybdenum, as well as Vitamin D.
Dandelion greens can be stored in a bag in the fridge for up to a week.