colder then what was it 55 degrees and you will prolly lose your plants. There are some strains that can take alot though. Some strains are from weird parts of the world and some strains like pure warmth. Well almost all do. The rule of 55 to 85 is the best to go by though. There may be some strains that wont mind it a little on the cold side though.

If you can contact a few breeders and see what they have to say maybe someone can recommend a strain that might stand up to cooler temps.