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Some plants are successfully grown under continuous artificial lighting ...[attachment=10315]http://www.hampshire.police.ukwhere the value of crop is sufficiently high to cover cost of the electricity, (in cannabis farms the lecky is probably being knicked). http://www.madsci.org/posts/archives/2003-09/1063237248.Bt.r.htmlSome plants do need to experience daily darkness to synchronise with the seasons ... http://en.wikipedia.org/wiki/Photoperiodism
A lack of darkness periods during the 24hr cycle could be rather confusing for some plants, such as the 'Daylily' (Hemerocallis ).
On the programme "The Naked Scientists in LA" I met up with Steve Kay who is a plant scientist at UCSD. He works specifically on plant circadian rhythms; here's a link to the interview about plant body clocks.Chris