I have heard that commercial nurseries alter the light exposure in order to get mums and marigolds to bloom while small.
How much do I need to shorten the light cycle for marigolds in order to get them to bloom early?
http://www.press.uchicago.edu/Misc/Chica...
http://www.charleysgreenhouse.com/index....
The second one will probably be most useful.
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