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Can someone talk RH to me please?

SamHeinous

SamHeinous

New member
Ok, so I've read a bunch of stuff - and it seems like most people are trying to keep their humidity DOWN in their tents and boxes. I, on the other hand, have quite the opposite problem. Humidity here hovers around 15% on a "muggy" day, and less than that normally.

Do I need to do something to increase the humidity in my grow box? After a good watering, it can get as high as 30%, but only for a short amount of time. What specifically, are going to be the benefits of me trying to get the humidity level up? Should I even bother? Am I inviting problems I just don't have to deal with, or will it really affect the plants growth and bud quality?

Anyone?
 
I am surprised your tent numbers are so low. It is all of 8% RH outside here today, but still 51% in my tent (My exhaust is always on). I have three big plants in constantly wet coco.

Perhaps play with your exhaust. Unless your plants are quite young, they should be producing humidity. I am curious how your exhaust system is set up and where you vent to and draw from. How many plants are they, and I assume you are growing in soil... how frequently do you water them?

I think it is awesome to have really low humidity. It allows me to create tons of humidity with my grow style that others have to pay to de-humidify. Perhaps consider a grow style that produces more humidity.

In the end the humidity in the tent should be higher than 30s.

Finally, If it is that low you should run lower EC/PPM (more diluted nutrients).

Cheers
 
I routinely grow plants during the winter when the RH is in the 20's and the only thing I find is the plants start out slower- but seem to catch up once a good root system develops.
There is no loss of both quality and quantity, over growing in the summer when it's 40-60% with higher amounts in the tent.

Last summer, I set up a tent which ran at the optimum RH and was chasing/mindful of VPD- I had exceptional looking plants in veg- but again- quality and quantity at harvest was the same when I didn't do all the work involved to maintain RH.
 
I'm growing in soil, but eyeing the switch to coco because of the increased humidity it can produce. I water about every other day, or whenever they feel dry. I haven't noticed any problems with growth, but I'm so new at this, I probably wouldn't know a problem like that if I saw it, lol.

I've currently got three in flower, and two in the veg chamber. Venting is elaborate,but possibly not right? I don't know how to explain it and I'm not at a place this morning where I can post an easy picture of the grow box. It has an exhaust fan that is currently nearly always on because... it's hotter than hell here right now.

I'm kind of hoping the switch to coco resolves some of that.
 
Yes, I absolutely recommend Coco and running it like I do. Be sure to check out my guide. You will not have problems with low RH in the tent if you follow my guide!

My main interest is where are you venting and drawing air from. Do you vent your air outside? Also, what kind of lights do you run (interested in the heat they put out).
 
No, it doesn't vent to the outdoors - it just vents to the room. I'm currently using T5's, but looking at moving to LED's as soon as I can justify it to my husband, lol. They aren't putting out a lot of heat - temps are currently hovering around 75 and 80 degrees inside the cabinet. I checked this morning, and it was 78 degrees and 27% humidity in there, and I watered last night.

I saw your coco guide, and that's what I'll be using as I make this switch - it's very comprehensive and helpful!
 
Cool!

SO it vents and draws from the same room? and the room is air-conditioned? Can you close the room to trap the humidity and still keep it cool?
 
Yes, it draws and vents from the same room - which unfortunately I can't close off, as it's my front room. It is air conditioned. That's probably not helping huh? Hmm. We'll see what happens when I switch to coco I guess!
 
Yeah, it would help if the tent was in a bedroom or similar space that you could close off to trap the humidity and essentially recycle it. That is how I manage it. My tent draws from near the floor and vents along the ceiling of my office (spare bedroom). I close the door when I need humidity to go up, and open the window when I need it to go down. (Note to others: This is only appropriate if you live in a VERY dry climate)
SamHeinous , If your problem is always being too dry then you are probably good to go without changing the set-up if you run Coco! :)
 
SamHeinous
My two main recs for dealing with your low RH on the current grow
1. Run lower EC/PPM: Plants will need to take in more water through their roots because RH is low. High EC could burn them.
2. Don't defoliate. The leaves will help increase RH. I think the main benefit to defoliation (if there is one) is lowering RH. This is clearly not in your interests.
 
I struggle to keep RH at acceptable levels too, except during mid veg. I tried an ultrasonic humidifier but it puts out a white dust from minerals in water, unless you use RO water, that gets all over your plants. I have switched to an evaporation humidifier, with humidity control, and it is working great.
 
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