Frost flowers are delicate ice formations that occur on the surface of certain plants when temperatures drop below freezing. They typically form when moisture from the plant's sap is drawn out and freezes rapidly, creating thin, petal-like structures that resemble flowers. These formations are most commonly seen on winter plants like wildflowers and grasses. The process of frost flower formation requires specific conditions, including high humidity and calm winds. They usually appear in late fall or early winter, often in the early morning when temperatures are at their lowest. Frost flowers are short-lived, melting away as temperatures rise during the day.