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Chrysanthemums can grow in zones 3 to 9.
It is best to divide chrysanthemums in the spring.
Chrysanthemums grow best when there is a lot of light available to them. They do best in fertile, sandy soil which should be well draining as they are susceptible to mildew.
Chrysanthemums need well drained soil. So clay is not good. Sand or Miracle Grow as long as the Miracle Grow does not retain water.
Chrysanthemums are best transplanted in summer or early fall.
Grow best in all countries except countries with desert
If planted early enough in the season for the roots to grow, chrysanthemums are perennials.
Chrysanthemums add color to the fall garden. Not many flowers bloom in the fall.
http://landscaping.about.com/od/landscapecolor/p/chrysanthemums.htm
The chrysanthemums that people buy at the florists or grocery store in fall and put out for their color will die with the frost. If you want chrysanthemums to grow the next year, you have to buy them earlier in the year and pinch off the flowers until after July 4th. Those will grow the next year.
It is best to transplant them in September.
Plant Chrysanthemums in full sunlight.They respond best to the shorter days and longer nights of fall in the Northern Hemisphere.