Wonder what Native Plant Poetry Month is? See my explanation here. We wrapped up week one of Native Plant Poetry month with three poems from poets past and present on three different native plants! Day 1: “The Blue-Flag in the Bog” The purple-blue flower of Iris versicolor (blue-flag iris). By USFWSmidwest - Blue Flag Iris, Public Domain Our first poem for Native Plant Poetry month was Millay’s “The Blue-Flag in the Bog,” which celebrates the Iris versicolor (blue-flag iris), one of our native irises.