The bitter chrysanthemum blooms with small blue flowers when it enters early summer. It is a one-day vanilla that blooms in the morning and closes at night, but it can continuously develop. The leaves have a bitter taste. After softening, the bitter taste will decrease and become soft. It prefers cold weather. In early summer, the flower stems, flowers and young leaves can be added to salad, or fried and eaten. It has antibacterial, antipyretic, anti-inflammatory, and eyesight effects.