I am growing inside a box and I have some heat problems. Right now the temp in the box is in the high 80s. I am going to use 2 computer fans for intake and extake so I should get some circulation. i was just wondering what the hottest temperture anyone has successfully grown at?

though ideal temp is 76ish, you will have a successful grow at the high 80s as long as you have air ciruculating in there. good luck!

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I have read from very good sources that all growth stops at 90 degrees, barring the use of co2. You should really get your temps down to no more than 85, with 80 being optimal temp when the light is on.

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I did wonder what too much heat would do... my plants still seem to be growing... I'll keep watch on this.

So did mine, but this was because my box only reached 90 degrees for 2-3 hours per day, tops. Now that I only run my light for 12 hours my temps are right where they should be, and you know what? Growth has increased significanlty.

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Pics Of My First Grow