How do I manage day length and lighting to flower exotic chrysanthemum on time?

Chrysanthemum is a short day plant, it flowers when nights are long enough, so growers control this artificially. To keep plants growing leafy without flowering, you give night break lighting that breaks up the long night, and when you want them to flower for a target date, you stop the lighting and may use black out cloth to give long dark nights. By managing this you can flower the crop almost any time of year and hit wedding and festival dates. The exact number of dark hours and the count of weeks of short day needed before flowering depends on the variety, so you must follow the variety's response group. Get the specific lighting and black out schedule for your variety from your supplier, KVK or a floriculture specialist, because guessing it will throw your timing off.