Humidity questions!

No matter what I do I can't get my humidity where I want it (and yes I DID put a humidifier in the room which is rated for 10 times the space). The room varies from 20-35% humidity. Low 70's lights off, Mid 80's lights on for temps. Using MH on 18/6. What sort of issues will I come across growing in such low humidity?

slow growth, low resin production.
if it`s rated for 10 times the space you must have something set up wrong then.

What should the humidity be for veg and bloom??

i like mine in veg 50 to 60 and in the beginning of flowering 60 to 70 then at the end 30 or as low as i can get it for the last week to 10 days. and through my dry and cure

Would misting the plants just AS the lights turn off help? Would the leaves retain more moisture this way? Maybe I should get a better humidifier??

if you cant get the fresh air from outside i dont think they work to well. dont know what kind ya got.. i would wait till the plants cool down before foliar, could burn and i dont think it would help enough.
what is your ventalation set up. fan and intake and shit.

I am using 400MH in a 12sqft area. air in from my room which is air conditioned, and the air in the grow room is sucked outside with a 490cfm axc fan. even though the humidity in my room is around 40-60 the light in there being so hot must burns off all the moisture, leaving it with 20-30.. then that air is sucked outside with that axc fan.

I have been looking for more info on humidity also. I also have a humidifier and mine gets anywhere from 32-40% during the day. I just got the humidifier in there today, should I leave it on all night and let the humidity rise during the night? I imagine the humidity would jump quite a bit...

need to find a happy spot to keep a steady level. it will always be higher with lights off

I always thought low humidity (Especially in flowering stage) would help the resin production. what am I missing?

woo2woo said:

What should the humidity be for veg and bloom??

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For vegetative growth ideal humidity would be 60-70. For flowering would be 50-60. If you have problems with maintaining a high humidity you can do the following, a) mist water in the air because relative humidity is basically the amount of water that can be transpired into a given space b) place containers of water in corners of your grow area c) looks like you do this is using a humidifier like I need to do for my vegetative room d) increase the number of plants in your operation, more plants means more water being transpired in the air from them. You hear more often times that people have a humidity too high and not too low like we both at times have trouble maintaining. Good Luck hope this helps.

woo2woo said:

Would misting the plants just AS the lights turn off help? Would the leaves retain more moisture this way? Maybe I should get a better humidifier??

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It is good to mist your plants in the morning daily because it mimicks rain fall therefore jacking up your humidity. You get the jungle effect. Plus it helps your plants have a more healthy foliage because especially in veg when the lights are on for 18 hours the tendency is the enclosed space to be dry and also the foliage to be dry.

juicemc22 said:

I have been looking for more info on humidity also. I also have a humidifier and mine gets anywhere from 32-40% during the day. I just got the humidifier in there today, should I leave it on all night and let the humidity rise during the night? I imagine the humidity would jump quite a bit...

Click to expand...

The problem is that humidity is harder to control when the lights are on. The heat generated from the light fixtures dissipates the transpiring water from the foliage. It is best to utilize the humidifier during the times you have the lights on. When the lights are off most cases the humidity climbs to more easier manageable levels.

NoDrama said:

I always thought low humidity (Especially in flowering stage) would help the resin production. what am I missing?

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It does but to have a consistent humidity level below 50% will have an effect of water exchange with the enclosed environment. Let us say you have a RH of 30% in the flowering state. That would mean the amount of water is not being transpired in the air is not occuring. Where is it going? Well it is still being locked in your plants. If your plants do not have an active means of transipiring the water it does not need then it stays in the foliage. If you have too much water in the foliage it causes other problems internally. Think of it if we drank too much water but we do not sweat. What would happen? We would bloat correct because we are retaining the water. Same concept with plants.

So should I leave the humidifier on all night, or just shut it up with everything eles and let the humidity level rise on its own? or will it? HELP!

Dude you numbers look fine. I like my humidity low and have explosive growth. I wouldnt change anything unless you notice an issue with the plants. I doubt you will. My humidity has been running around 20-40 in veg now with no issues. I like the mid 80-85 temp deal to. During flower i like my humidity as low as i can get it to increase resin, lees mold etc.

Be happy you are dealing w/ low humidity rather than high....

And i think Calicat got his words mixed up... Higher Temps and Lower Humidity will cause more transpiration. The more transpiration you will experience will mean is more water uptake because the plants "arent retaining water". Faster water uptake can equate to higher nute uptake. So just be mindful and gradually raise your nute levels. And water in the corners won't do didly.Now i feel 20-35 you have is fine, but there are many factors involved. Like having a root structure and medium in which you plant can take in the extra water. So all i speak is DWC keep that in mind. I dont know if it makes a difference.

If you are stuck on getting your humidity up the best humidifier i have used (only used 2 ..lol) is a utrasonic humidfier on overstock linked below. It is only about 3" cube and attaches to water bottles of any size. So depending on your space you can use a 3 liter or 12 oz bottle. If you have a whole room you will need a bigger humdifier but this kept my 8 x 2.5 x 10 foot closet humid.

http://www.overstock.com/Home-Garden/Travel-Size-Personal-Ultrasonic-Humidifier/3103035/product.html#moreinfo

Thanks to all that have replied, I enjoy reading others thoughts and ideas.

I was looking at a larger humidifer at my local store, right on the side of the box it explains that having proper humidity in the room will have your plants greener and more lush... I am considering purchasing this larger humidifer (8gal output a day), which has a digital humidistat to control the humidity (great for lights on and off). If I choose to get it, I am going to set it to 50-55%. Soon at the flowering stage begins I am going to remove the unit from the room altogether, to drop the humidity as low as i can get to prevent mold and increase potency.

I encorage others to post on this, I notice this topic isn't disgussed as much as others.