May - Lily of the Valley
This beautiful flower featuring tiny little bell like blooms is a popular choice for bridal bouquets. Princess Grace of Monaco and the Duchess of Cambridge Catherine Middleton chose Lilly of the Valley for their bouquets. This flower is the symbol of spring in many countries. Although it may smell sweet (designers like to replecate the scent), and it signifies happiness, Lily of the Valley is a highly poisonous.