If you're putting in bedding plants, any time is good. If you're planting seeds, check on the package for time tp flower, to make sure you have time before first frost. This article will help you with general how-to's: https://www.gardeningknowhow.com/ornamental/flowers/stokes-aster/stokes-aster-care.htm
Answered on June 24, 2014
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