Have you ever seen a frost flower?! When conditions are just right—the ground is not frozen but the air is—you might see papery-white blossoms unfurling from long-stemmed plants. Frost flowers form when when sap in the stem of a plant expands, casting long, thin cracks along the length of the stem. Plants that commonly form frost flowers are Verbesina virginica (white crownbeard), Verbesina alternifolia (yellow ironweed), Cunila origanoides (American dittany), and Helianthemum canadense. Photo by: Dean Morris / Flickr.
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