Can plants still grow/bud when leaves turn purple?

Hey I didn't know wether to put this under the indoor or outdoor forums buts since my girls are inside now I figured I'd put it here. Anyways I started my grow outside but because of the cold of Maine and amateur mistakes that slowed my growth I was forced to finish inside. There were some nights they were outside where it got to high to mid 30's but never actually went through a frost. Because of the cold a lot of the leaves have turned a dark purple.(I'll get some picks later today when I get home). So now that they are inside and the temp is no longer a real issue my question is will the purple leaves effect how they grow and can they still finish even though a lot of the leaves have turned purple or are turning purple? Thanks in advance. PS I know its not a phosphorus issue which I understand can turn plants purple too.
 
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