During the 1920s and 1930s, the May Day tradition reached its peak. In the aftermath of the Spanish Flu Pandemic, individuals would fill tin pots or small baskets with potted plants or fresh flower bouquets. They would leave them anonymously on the porches of loved ones or hang them from the doors of neighbors and friends. To engage in this custom in the traditional way, one would leave the gift anonymously, knock on the door, and quickly leave the scene.