Flowers can represent several different things, from holidays to friendships. Knowing the flowers that represent the months of the year helps to know what the best time to buy each of these flowers are. Some of the flowers, such as the lily in May and the poinsettia in December, correspond to the holiday within the month. Other flowers, such as the daisy in April, grow in their respective month. This graphic is a detailed outline of the flowers of each birth month.