Short-day plant

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1. a plant that requires a night longer than its critical dark period, usually 12 hours or more, to develop flowers.

http://www.biotopics.co.uk/ photos/poinsettia.html

This is a short day plant, which means they need the stimulus of restricted day length before they develop the flowers and coloured bracts - the reason why plants kept to the next year do not usually colour up in the same way.

Source:http:// www.biotopics.co.uk/ photos/poinsettia.html