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Dahlia flower seeds are relatively small, around 1/8 inch (3 mm) in diameter. They are usually round or oval and have a rough, somewhat irregular surface. The seeds can vary in color from light brown to dark brown or black. They are typically enclosed in a thin, papery seed coat. Dahlia seeds are often sown on the surface of the soil or lightly covered, as they need light for germination. They prefer warm temperatures and well-drained soil for successful growth and can be started indoors or directly sown in the garden.