Help with slow growth... humidity problems

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jack06041989

Active Member
So my current grow has been a fucking nightmare thus far!! The girls have been alive since around 6th November so it’s been nearly 2 months already and as you can see they haven’t grown like they should!! I was hoping to flip them by now but they are way too small!

I did have a bad thrip infestation which I stupidly let get out of control but it’s under control now, so that would have stunted their growth for one?

also I’ve they have been transplanted twice.. so they are in their third and final pot now, stunted their growth again?

thirdly I haven’t been able to get my RH above 40% in people experiences is this a big factor to slow growth during veg? I’ve bought a small humidifier today and it only works when my exhaust fan is turned off.. I can get it up to 45% but then the temp gets up to 31 so I then have to turn the fan back on which then drops the humidity below 40 again. I can’t really win!I also have a fan controller so I put it on the lowest setting but it still sucks all the mist out before the humidistat can start going higher. Does anyone have any experience with this and have a solution? My area is 8ft by 12ft so in hindsight the humidifier I got is maybe too small.. but if I get another bigger one will the exhaust still not suck it all out and bring the RH right down again ? Any suggestions or help would be much appreciated
 

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J

jack06041989

Active Member
Also after the last transplant I fuckimg forgot to ph my nutes fed them at around 8 and now some of the fan leaves have brown crispy edges
 
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L A K E S I D E

Member
I had my humidifier in front of a fan to blow it out and across the tent. Also the AC Infinity fans can be setup to maintain desired humidity if upgrading the fan is an option.
 
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Driver733

Well-Known Member
I've been dealing with the same issue here, this is my first winter growing in this house so I am trying to figure out the best way to control the temperature and humidity without both flowing right out the window too quickly.

I have a grow room with two tents, one for veg and flower, for ventilation I have AC Infinity inline fans, two for each tent. I have one fan on #3 or #4 constantly, passively drawing and exhausting air in the room. This keeps the air moving and never stagnant, while keeping the heat and humidity in the room. This fan is set to shut off if the tent gets below a minimum 75 degrees F in the tent, and has an alarm when this happens. I also have a dehumidifier in the room set to 45% to keep the room in check.

The second fan also passively draws air into the tent from the room but exhausts the air directly outside. This fan is set to only kick on if the tent temperature goes above 79 degrees F or the humidity is above 62% in the tent. To get the humidity up, I put a small $40 rite aid evaporative humidifier right in the tent. I take the humidifier out of the flower tent during flower as it is not needed.

Running two fans is the only way to both maintain a maximum temperature and humidity while also maintaining constant air flow.
 
Romeo7701

Romeo7701

Well-Known Member
Driver733 said:
I've been dealing with the same issue here, this is my first winter growing in this house so I am trying to figure out the best way to control the temperature and humidity without both flowing right out the window too quickly.

I have a grow room with two tents, one for veg and flower, for ventilation I have AC Infinity inline fans, two for each tent. I have one fan on #3 or #4 constantly, passively drawing and exhausting air in the room. This keeps the air moving and never stagnant, while keeping the heat and humidity in the room. This fan is set to shut off if the tent gets below a minimum 75 degrees F in the tent, and has an alarm when this happens. I also have a dehumidifier in the room set to 45% to keep the room in check.

The second fan also passively draws air into the tent from the room but exhausts the air directly outside. This fan is set to only kick on if the tent temperature goes above 79 degrees F or the humidity is above 62% in the tent. To get the humidity up, I put a small $40 rite aid evaporative humidifier right in the tent. I take the humidifier out of the flower tent during flower as it is not needed.

Running two fans is the only way to both maintain a maximum temperature and humidity while also maintaining constant air flow.
Click to expand...
Morning I always keep my humidity at 50% or as low as 40% I've never had a problem with producing a good harvest.
That's just my preference it also cuts down on the chance of Mold and Mildew during flower, I also like to mist my girls
throughout the grow at least once a day and yes I do it with the lights and fans on, I've never had any problem...
 
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Driver733

Well-Known Member
Romeo7701 said:
Morning I always keep my humidity at 50% or as low as 40% I've never had a problem with producing a good harvest.
That's just my preference it also cuts down on the chance of Mold and Mildew during flower, I also like to mist my girls
throughout the grow at least once a day and yes I do it with the lights and fans on, I've never had any problem...
Click to expand...
If I don't run the humidifier at this time of year, the humidity is 30% or less and the plants in veg seem to struggle, in my experience. Thank you.
 
Romeo7701

Romeo7701

Well-Known Member
Driver733 said:
If I don't run the humidifier at this time of year, the humidity is 30% or less and the plants in veg seem to struggle, in my experience. Thank you.
Click to expand...
Yes mine come on and go off as they need to and my infinity 6'' exhaust does the same speeds up and slows
down as is needed my misters come on at 11am stay on five min, its a very fine mist and brings the humidity
up to around 58 and lasts about 30 min then starts dropping back to 45% my dehumidifier is set on 76, temp
stays at 75f to 78f...
 
SnoopyDoo

SnoopyDoo

Well-Known Member
reallycoolguy said:
Don't worry too much about humidity thats not your problem right here.
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Agreed... unless you're dropping below ~25% frequently. Temps don't seem to high. Maybe they're still suffering from the thrip attack. In the pics the light looks good, but how much light do you have? Have you tried foliar feeding (preferably with a Kelp product), which can snap them out of a funk and raise humidity, although it may not register on the humidistat.
 
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MItonic

Well-Known Member
Theres alot of unkown variables hete honestly. What lights are you running? What watts? Whats the feed?

If you're running led VPD can play a factor in this.

If you're NOT running legit leds then they are either suffering a root issue or over watering issue.

How long has the thrips issue been under control? If its been a few weeks, then its HIGHLY doubtful thats is the issue here.

Dont water then for 2 or 3 days and see what they do. In past runs with 50/50 coco perlite mix i would only water every 2.5 days in flower..... soil retains water better than coco...
 
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MItonic

Well-Known Member
LED lights require a higher humidity/VPD factor than hps or cmh. LED is a much stronger spectrum in the sence of actual light. Watt for watt btu is always the same but intensity itself is very different.

When running a legit LED light (not blurple bullshit or 700,000 watt amazon light) but one made from samsung diods, proper drivers exc, one needs to maintain proper VPD (vapor pressure deficit) this falls inline with typically higher RH in the room
 

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Quintana

Quintana

Well-Known Member
My humidity has always been between 37-45% and I've had no issues, so I don't think that is an issue.

To me it looks like over watering. I used to grow in soil and stopped. How warm is it in your grow area?

If it was my grow, I would get rid of some of those fan leaves, get the granules off the leaves, thoroughly clean up the grow area to stop opportunities for pathogens and critters to grow, and get more air flow through to help with plant transpiration, and reduce watering until you see the top of your soil dry out finding about 1/2" down. If you're seeing critters, dust the top of your DRY soil with diatomaceous earth (it becomes ineffective when it's hit with water). Try to keep your leaves clean.

Next time around I'd recommend going with Coco + 30% perlite. It takes out any guess work in watering and removes a factor that can give you problems. It makes water, bugs, and root rot less of an issue.
 
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