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Dianthus flower seeds are small, round, and slightly flattened, usually measuring about 1/16 inch (1.5 mm) in diameter. They are typically dark brown to black and may have a smooth or slightly textured surface. The seeds are often contained in a dry, papery capsule, which splits open when mature to release the seeds. Dianthus seeds are generally sown on the surface of the soil or lightly covered, as they need light to germinate. They prefer cooler temperatures for germination and can be started indoors or sown directly in the garden.