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Sweet pea flower seeds are large compared to many other flower seeds, typically about 1/4 inch (6 mm) in diameter. They are rounded and slightly flattened, with a smooth, hard surface that is usually beige or light brown in color. The seeds are encased in a hard, glossy shell that can sometimes appear mottled. Sweet pea seeds are commonly sown directly into the soil or started indoors, and they benefit from soaking or scarification to improve germination. They require well-drained soil and cooler temperatures for successful growth.