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Thread: What Range Should I Maintain for my Growroom Humidity and Temperature?

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    420 Member SmokeyMacPot's Avatar
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    What Range Should I Maintain for my Growroom Humidity and Temperature?

    Daytime conditions should be 70-80 degrees without co2, 80-90 degrees with co2 until the last two weeks when daytime temps should be kept between 70-80 and co2 can be reduced to adjust for the lower metabolism. Night temperatures should be kept above 60 degrees to prevent stress. It is preferrable during flowering to have a night temperature drop of 10-20 degrees to stimulate flowering hormones and reduce stem elongation.

    I find that low humidity causes stress on plants. I recommend 50-60% humidity until the final 2 weeks of flowering. At this point, the humidity should be lowered as much as possible to encourage the plant to seal and protect itself with additional resin. (I am able to get the humidity to go as low as 31%) I have been able to frost things up considerably this way. The higher humidity levels prior to final ripening reduce salt levels within the plant tissue and encourage healthy, more lush growth.

    Author: MisterIto

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    420 Member squint2focus's Avatar
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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    and your recommended ways of dealing with humidity?
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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    air flow, humidifiers and/or de-humidifiers

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    New Member slipknot420's Avatar
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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    what do you use to see what number where the humidity is at

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    420 Member Aberration's Avatar
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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    I bought a digital temp/rh meter at a local hardware aisle.

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    ----Plant of the Year Winner---Plant and Nug of the Month Winner (Dec 09') Mr.GrowitALL's Avatar
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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    what are some tips to lowering the humidity in the closet space?

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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    warmer air or a dehumidifier

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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    Quote Originally Posted by DaMagoMan View Post
    warmer air or a dehumidifier
    hey damagoman, i am growing in a small closet and the summer hot weather is coming. it usually gets around 104 deg outside. any tips on keeping my grow room nice and cool. i was thinking of running a small ac unit in there but im kind of cramped in there already. any ideas. your help is much appreciated

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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    What kind of lights?
    If not Compact Floros, maybe switching to them.

    A/C is the only option sometimes.
    They make small and portable ones.
    Just a matter of money

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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    Quote Originally Posted by DaMagoMan View Post
    What kind of lights?
    If not Compact Floros, maybe switching to them.

    A/C is the only option sometimes.
    They make small and portable ones.
    Just a matter of money
    Hey Damago,

    I am using just a regular T12 floro light for vegg. I plan on switching to 400 watt HPS in two weeks when i start flowering. I guess im going to have to look into a small ac untit. Thank you very much for your help.

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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    You need it most during flowering,
    can make the difference between a Good crop and a crap crop, for sure.
    Temp drops in your dark cycle are very important when flowering.

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    420 Member naturalhi's Avatar
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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    Also running lights at night helps, I run 1KW HPS from 6PM - 6AM for several reasons not the least is temp control!>)
    It just doesn't matter..... and what if it did!

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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    Quote Originally Posted by naturalhi View Post
    Also running lights at night helps, I run 1KW HPS from 6PM - 6AM for several reasons not the least is temp control!>)
    Not a bad idea. I think i am going to have to do that. Thanks for the tip

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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    Quote Originally Posted by DaMagoMan View Post
    You need it most during flowering,
    can make the difference between a Good crop and a crap crop, for sure.
    Temp drops in your dark cycle are very important when flowering.
    That's what i was told. thanks for the info

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    420 Member naturalhi's Avatar
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    Re: What Range Should I Maintain for my Growroom Humidity and Temperature?

    The safest way to switch from day to night lighting is when the light turns off let the plants sleep at least 24 hours before the next cycle starts; ergo, if yer shut off at 6PM now don't turn them on till 6PM the next day. This reduces chance of hermys!>)
    It just doesn't matter..... and what if it did!

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