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Even though Asters can be grown from seeds, germination may be uneven. It is advisable to start Aster Pompon flowers indoors during the winter season. Sow the seeds in pots or flat trays and keep them in the refrigerator for 4 to 6 weeks to simulate the winter dormancy.Aster seeds are sown 1 inch deep into the soil. After 4 to 6 weeks, keep the pots or trays in a sunny spot in your home. You can transplant the seedlings outdoors once the danger of frost has passed.If you are planting seedlings with the transplanting method, it is best to do it from mid to late spring. Keep a distance of 1 to 3 feet between the plants, depending upon the type of Aster you are growing and how large the plant can get.