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Dianthus seeds are small, typically around 1-2 millimeters in diameter. They are round to oval in shape and have a hard, smooth texture. The seeds are often dark brown to black and may have a slightly mottled appearance. They are usually contained in a small, dry seed capsule, and are known for their ability to remain viable for several years if stored properly. Due to their small size, they can be challenging to handle, so it's common to mix them with a fine sand or use seed tapes for even distribution when planting.