HOW TO PLANT ASTER SEEDS When sowing outdoors, spread the seeds across the surface of moistened soil. Repeat this several times every 10-14 days and keep the soil moistened to ensure an extended blooming season. When grown indoors, transplant into the garden 6-8 inches apart. HOW TO CARE FOR ASTERS Asters are easy to maintain. Do not allow soils to dry out. Mulching around each plant can both keep weeds down as well as aid in moisture retention. Taller flower stalks may need to be staked to keep them from falling over. Keep from crowding asters together wherever possible to allow for better airflow between plants. Plant in different locations each year to reduce the risk of spreading potential pests or diseases.