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Calendula flower seeds are small, roughly oval, and have a brown or dark color. They are encased in a tough, papery shell with a slightly rough texture. Each seed measures about 1/4 inch (6 mm) long and is often angular or ridged. Calendula seeds are typically harvested from the spent blooms of the plant and are known for their ease of germination. They are usually sown directly into the soil or started indoors before being transplanted.