Answer: Unfortunately, it is quite difficult to winter this grass unless you have a cool greenhouse -- say about 45 to 50 degrees. Allow the plant to slow down, trim back the tops and hold it barely moist over the winter. Then in spring repot into a larger pot and set it outside again.
A seedling ornamental grass is actually very small, so it really would not be worth the effort to save the seeds. The ornamental grasses such as yours are usually propagated or started and sold as root divisions.
All of the above explains why gardeners who like this grass grit our teeth and buy more each spring.
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