The article explores the unique cultural aspects of hibiscus and daylily flowers in Vietnam and China, where these flowers are consumed only once a year due to their brief bloom period and toxic nature. Despite their danger, these flowers are incorporated into various dishes and have therapeutic values. In China, daylilies are valued for their taste, texture, and medicinal properties, including heat clearance, diuretic effects, and swelling reduction. They are also used to treat jaundice, edema, and difficulty urinating. The article highlights the high cost and popularity of daylilies in China and Vietnam, with prices reaching up to 1 million VND/kg for the dried variety.