Short-day plant
Revision as of 19:58, 9 April 2006 by Roberts.382 (talk | contribs)
1. a plant that requires a night longer than its critical dark period, usually 12 hours or more, to develop flowers.
2. 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