Ideal marijuana temperatures?

Ok, so I have 3 plants growing in my room (from seed). they are still young and i'm waiting till they get a bit bigger before I transfer them to my basment crawlspace where I have a nice grow space set up. This is where the question comes in...How cold can it get for plants to still be able to maintain a healty growth pattern? it's very well insulated but it still gets cold at night in there esspecialy in the winter. Whats the coldest temp a plant could be able to live with? and what is the most comfortable temp for a plant to thrive in? Would appreciate any help.

you do not want it to fall below 60F

75 when lights on,65 when off will work great.

awsome, thanks alot. exactly what I needed to know.

how close it your light? that right one looks a bit thin and stretched, otherwise 80-85 lights on is tops, no less than 65 lights off, really about a 15 degree swing.

it should be more like a 10f difference,,,,,,75 is the ideal temp when lights are on,65 when off,,,,,yes you can go as high as 85 but thats not the ideal temp which is what he was asking for.peace

sorry to steal the thread but i think he got his answer..
i just started and keep the door cracked but it closed one day and got up to 103 for about 10 hours.
the seeds havent sprouted yet but its been 4 days and i'm starting to think they won't cause it was so hot.
any comments would be appreciated.

plants sprout outside when its 103. Why dont you juss throw some fans in there.

mclaughlins said:

sorry to steal the thread but i think he got his answer..
i just started and keep the door cracked but it closed one day and got up to 103 for about 10 hours.
the seeds havent sprouted yet but its been 4 days and i'm starting to think they won't cause it was so hot.
any comments would be appreciated.

Click to expand...

As long as the soil was moist they will still sprout. Patience.