Dandelion is an extremely common plant through temperate North America and Europe. It is widely recognized as a weed, a word that generally means that it is an undesirable plant, undesirable because i...Dandelion is an extremely common plant through temperate North America and Europe. It is widely recognized as a weed, a word that generally means that it is an undesirable plant, undesirable because it grows in places where people are trying to grow something else, and, at least to some people, undesirable because of its looks — perhaps not so much the bright yellow flowers, but more likely because of the fruit heads and the rosettes of leaves in an otherwise uniform carpet of grass.