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Germination time: 10-18 days, temperature germination: 18-28 degrees Celsius. In early spring (sometime from the end of April through May), loosen the soil in the planting area, then direct sow seeds into the soil, raking them in lightly. Be sure to keep the seeds moist until they germinate. Once seedlings emerge, thin them so they are 15-18 inches (38-46 cm.) apart. The location of your double poppy plants should be where the soil is well draining, with a soil pH of 6.5-7.0, and where the plants will receive full or part sun.