One of the most cheerful plants in nature, daisies are native to all continents except Antarctica and thrive in most parts of the U.S. Aside from being cultivated by gardeners in flowerbeds, they also grow wild in many places. Although daisies have no leaves, they are known for their star-shaped heads and discs of florets made of black or yellow material. In fact, daisies are not actually flowers at all but instead are composed of many smaller florets.