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STORY: The featured flowers include the sweet pea, iris, lily, sunflower, fuchsia, tulip, peony, nasturtium, rose and dahlia.
The Royal Mail said the flowers are "some of the most popular flowers which are grown in gardens across the UK," adding that they were the first stamps with the king's silhouette.
Last month, new 'everyday' stamps featuring the image of King Charles were revealed for the first time.
From coins and banknotes and to the official royal cypher used by the government, Britain has been slowly introducing replacements featuring the new monarch since his mother's death in September.