Frost flowers form when thin layers of ice are extruded from long-stemmed plants in autumn or early winter and freeze. They appear along cracks in plant stems created when sap is frozen and expands. Water is continually drawn through the cracks due to capillary action and freezes upon contact with air, curling into lovely petal-like shapes. A rare sight, frost flowers are most often observed in shaded areas in the early morning and usually melt when exposed to sunlight. What is a “frost beard”? Discuss
Source: The Free Dictionary