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Rudbeckia is a genus of flowering plants in the family Asteraceae, commonly known as coneflowers or black-eyed Susans. These plants are popular for their bright yellow, daisy-like flowers with dark central cones. When Rudbeckia flowers are covered with hoarfrost, it creates a striking visual effect. Hoarfrost forms when water vapor in the air comes into contact with surfaces that are below freezing, creating a layer of ice crystals. This natural phenomenon can enhance the beauty of the flowers, as the delicate frost crystals add a shimmering, ethereal quality to the vibrant yellow petals and dark centers. The contrast between the warm color of the flowers and the cold, white frost makes for a picturesque scene, often appreciated by photographers and nature enthusiasts. This occurrence is typically seen in late autumn or early winter when temperatures drop overnight, and the conditions are just right for frost formation.