What temperture do I have to reach till its deadly for my plant??

im indoor growing in a grow box and have been reading that weed plants are starting to die at 85!? iam shocked about this considering the thought of outdoor growers in cali when it reaches the 100s! in the summer. so my question is, when should i worry about it getting to hot in my box what temperture?

i think when temps hit 80-85+ your buds just suffer a little bit because they are not as dense. cooler temps promote more dense buds.

but what if your veging

at 90 and above growth is slowed dramatically , but it doesnt kill it..
optimum is 75 f...IMO

yea sounds about right

so when would leaves start buring in veging? how hot

natalyss said:

so when would leaves start buring in veging? how hot

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i doubt anyone really knows that.. i would think well over 110 degrees. i mean people down south grow outdoors and temps reach 100-110 and the plants dont burn.. you may get burn from putting your light too close but that heat will cause a fire... anything over 75-80 degrees in veg will drive up the number of males you get greatly.