Patience is a virtue. That is what makes canncom different from that other big site with the pot leaf wallpaper. We are oriented towards getting new medical growers up and running. I do NOT like to see people getting testy with noobs who are just trying to get information (although you can flame noobs repeatedly giving shitty advice all you want, within the rules of the site of course). If you aren't going to help, just spectate, and if you've got a link, great- but please pretty please be more gentle about it.

Canabiloid, 'humid' is relative- Plants don't like it arid; they like SOME humidity. Your goal as a grower is to match your humidity to your temperature fluctuations so that the relative humidity stays about 30-60% in veg and 30-40% in flower.

The reason that you are having a hard time finding that info might be because adjusting your humidity is so dependent upon your grow style.

Hudson and Rusty are leading you in the right direction. Do a test run and measure your high/low temps and high/low humidity. If you can, go into the room in the dark period and look at the %RH- if it is reading significantly higher, you will want to add exhaust.
Why?
Simple. What is dew? Dew is the moisture that WAS held in the warm daytime air falling out as liquid water when the air temperature drops at night, and cold air cannot hold as much water vapor as warm air.
Did you know that you can get dew indoors? It can condense on your buds, causing rot.
This is why you want to keep your temperature day/night numbers within ~10-15 degrees of each other, and be certain that you are still running your exhaust fan when the lights are turned off.
Adding plants will add humidity, as they transpire the water that you give them into the air, and as they grow, they use and transpire more- so your numbers will change over time, and you'll just want to keep an eye on that. Different styles of growing also add moisture to the air- if there is a large surface area of water or moist medium exposed, as with a hydroton ebb n flow bed, that can be a source of evaporation.

Bud rot is likely to set in, especially with dense strains, at %RH over 50. So avoid that.
stinkyattic Reviewed by stinkyattic on . quick n00b question re: heating & humidity does the HID light provide the heat for the grow room too? or do i need a seperate heater/source? also as i need to control the environment inside the tent best as possible i was thinking of buyin a humidyfier because i heard they like it humid.. but im sure i also read somewhere that seedlings dont like it humid or it causes root or stem rot. does this mean i should only turn the humidyfier on after 5 nodes? thanks in advance :thumbsup: are there different preferable temps for the different Rating: 5