Frost flowers

Frost flowers are found in Ozark Mountains, also called Ozark Plateau,  heavily forested group of highlands in the south-central United States, extending southwestward from St. Louis, Mo, to the Arkansas River . A frost flower is a name commonly given to a condition in which thin layers of ice are extruded from long-stemmed plants in autumn or early winter. The thin layers of ice are often formed into exquisite patterns that curl into "petals" that resemble flowers

 

It is as beautiful as it is rare. A frost flower is created on autumn or early winter mornings when ice in extremely thin layers is pushed out from the stems of plants or occasionally wood.  This extrusion creates wonderful patterns which curl and fold into gorgeous frozen petioles giving this phenomenon both its name and its appearance.

Conditions have to be just so for frost flowers to form. Early winter and late autumn are the optimum time to come across them as although the weather conditions must be freezing it is vital that the ground is not.

As the temperature gets to freezing or below the sap in the stem of the plants will expand. As it does so the outer lay er of the stem comes under increasing pressure and microscopically thin cracks, known as linear fissures, begin to form. These will finally give way under the pressure of the sap and split open.

Water is continuously being drawn up the plant's stem while the ground remains unfrozen. It travels up the plants external structural axis (stem) and reaches the split or splits. As it does so, it oozes slowly out and it freezes. Yet more water is coming behind it.

This new water reaches the cracks and it too freezes, pushing the previous slither of ice away from the stem. In this manner the amazing 'petals' that you see in these pictures are formed.

 

Incredibly, the frost flower effect can happen to wood even when it has been made in to a fence or a gate, as seen above. In this case the water is extruded through the pores in the wood rather than cracks.

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The frost flower has a number of other names: you may know them as frost castles, ice castles, ice blossoms, or even the very scientific sounding crystallofolia. Yet the name is something of a misnomer: frost is created by water vapor. Frost flower, on the other hand, are formed from liquid water.

If you come across one – be careful! Rather than attempt to pick it up, if you have a camera or a phone with you take a picture instead. Frost flowers are incredibly delicate and will more often than not shatter when touched.