They forget to add that they taste like shit.Dandelion (Taraxacum officinale)
This suburban lawn scourge boasts a truly useful nature. Flowers (minus the green parts) are edible and have more beta-carotene than carrots. Add them to salads, bread and fry them, or ferment into a fruity wine. Young leaves offer the mildest flavor and are a gourmet salad green, rich with vitamins. Harvest the roots, dry, roast and brew them for a coffee substitute.