Senna hebecarpa (Wild Senna)Attracts pollinators Attracts birds with its seed pods Yellow flowers pop in the end of summer Wild Senna's bright yellow flowers bloom from July August. Their full blossoms attract many bees and butterflies. In the fall, its beautiful leaf colors and the formation of long black pods with seeds bring in many birds. Hardiness Zone 4 8 Height 3 6 ft Spread 2 3 ft