[header] How to grow asters [title] Prepare the seeds in winter. [step] If you choose to sow seeds indoors, you should do so roughly one to two months before your expected transplant date. [substeps] Note that seed germination tends to be fairly uneven, so do not expect all of the seeds you sow to grow. 
Since seed germination is so unpredictable, many gardeners prefer to buy seedlings from a garden nursery or to use plants divided from previously established asters. [title] Fill small containers with seed starting medium.