There has been a recent resurgence of interest in hardy chrysanthemums.  I’ve been growing this one in  my garden for the past ten years and it came through the wretched winter of 2010, so is probably as hardy as it will ever need to be.  The flowers are more demure than many chrysanthemums and in mild weather will last through to Christmas.  After a few years the plant can become untidy, with woody stems, so divide it or take cuttings to rejuvenate it.  The best time to do either is in the early spring.