Modern science has validated the ancient name "Sorrow-Forgetting Grass" for the daylily. A 2022 study published in Frontiers in Pharmacology confirms its significant antidepressant properties. The research revealed that the most potent antidepressant activity comes from the water extract of the daylily flower, outperforming the commonly consumed buds. A key active compound identified is Rutin. The mechanism works through the gut-brain axis: the extract enriches beneficial bacteria (like Bacteroides that produce GABA) and suppresses pro-inflammatory bacteria, thereby improving mood from the gut up. This research bridges traditional wisdom with modern science, showing that the most effective part of this common food may have been overlooked.