Need help. RH 50-75% and height problems.

There are two GG # 4 and one autoflowering + speed auto, now they are on the 24th of bloom. The temperatures with lights on are between 28-30 ºC and the RH is at 50-55%. When the lights go out, the temperature is 22-24ºC and the RH between 60-70%. Would it be convenient to put a dehumidifier?

This problem worries me more, I have height problems, the lights can no longer go up, and the plants are 15cm from the light, the upper part is not stressed by heat or excess light. How much more do you think they will grow? They are 4 cobs of 75w each.

Unless you are running a sealed room or tent, a dehuey ain’t gonna change anything unless you have a nice size dehuey that can dehumidify an entire room. Secondly, with adequate air flow, that humidity level shouldn’t hurt anything. I tried it on one run, ran the humidity at 60 the entire time, didn’t have 1 problem. Also, those temps are kind of high. Unless you are supplementing cO2, I’d try to keep it at 75-77.

I see space above the lights, take the chains off and attatch to the top bar, will get wxtra height not sure how hot the tops are but shouldnt burn anything.

Dontjudgeme said:

Unless you are running a sealed room or tent, a dehuey ain’t gonna change anything unless you have a nice size dehuey that can dehumidify an entire room. Secondly, with adequate air flow, that humidity level shouldn’t hurt anything. I tried it on one run, ran the humidity at 60 the entire time, didn’t have 1 problem. Also, those temps are kind of high. Unless you are supplementing cO2, I’d try to keep it at 75-77.

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Thanks, i had also entire grows woth rh up to 60% but was much bigger than this one, this is my first small grow in a tent of 60x60x140cm.

I have extraction of 183m3/h, and a fan between the lights and the tops of the plants and passive intraction . So would be a good idea to put a fan on the floor sending the air up?

2Hearts said:

I see space above the lights, take the chains off and attatch to the top bar, will get wxtra height not sure how hot the tops are but shouldnt burn anything.

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Thanks, i was thinking to do that, but I have the doubt if the extraction will be of any use then, by leaving so little space above. It's my first scrog and it got out of hand.

Dontjudgeme said:

Unless you are running a sealed room or tent, a dehuey ain’t gonna change anything unless you have a nice size dehuey that can dehumidify an entire room. Secondly, with adequate air flow, that humidity level shouldn’t hurt anything. I tried it on one run, ran the humidity at 60 the entire time, didn’t have 1 problem. Also, those temps are kind of high. Unless you are supplementing cO2, I’d try to keep it at 75-77.

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using co2 tablets with the irrigation water would be useful for the heat? or should it be a co2 cylinder?

I have also seen bags that are hanging, which absorb moisture and release co2. Would this be useful? Would it solve two problems, lower humidity and make plants more tolerant to heat?

As 2Hearts said, move them lights up cause @ 24 days of flower, them plants will be into your lights in 7 to 10 days. And if you begin to run out of space, its super crop time! Other than that... if you have enough air moving in there then no kind of humidity in there should be much of a problem. Seriously when it comes to humidity, if you get lots of air circulating in there then even hitting 80% humidity in there, though not optimal, won't kick up any mold or bud rot problems. I run all grows at 65% humidity from day 1 to when I harvest, but for example in a 5 x 5 tent, I have 4, 9" turbo fans on low, on the floor, pointing slightly upward, (blowing all through my plants), then I have 4 more 9" turbo fans running on medium, running between my lights and the top of my plants. Always remember, if any plant has water built up on any fan leaves while lights are on or off you need to up your air circulation if you can't dehumidify your grow space...

Krynn said:

Thanks, i had also entire grows woth rh up to 60% but was much bigger than this one, this is my first small grow in a tent of 60x60x140cm.

I have extraction of 183m3/h, and a fan between the lights and the tops of the plants and passive intraction . So would be a good idea to put a fan on the floor sending the air up?


Thanks, i was thinking to do that, but I have the doubt if the extraction will be of any use then, by leaving so little space above. It's my first scrog and it got out of hand.

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Might be time to invest in a portable AC unit if the temps continue to be an issue. But even an AC won’t fix your vertically challenged tent, it’ll just drop the temp. I would consider a new tent to be honest.

piratebug said:

As 2Hearts said, move them lights up cause @ 24 days of flower, them plants will be into your lights in 7 to 10 days. And if you begin to run out of space, its super crop time! Other than that... if you have enough air moving in there then no kind of humidity in there should be much of a problem. Seriously when it comes to humidity, if you get lots of air circulating in there then even hitting 80% humidity in there, though not optimal, won't kick up any mold or bud rot problems. I run all grows at 65% humidity from day 1 to when I harvest, but for example in a 5 x 5 tent, I have 4, 9" turbo fans on low, on the floor, pointing slightly upward, (blowing all through my plants), then I have 4 more 9" turbo fans running on medium, running between my lights and the top of my plants. Always remember, if any plant has water built up on any fan leaves while lights are on or off you need to up your air circulation if you can't dehumidify your grow space...

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Hey! Thanks! Light are up, now have 20 cm from light to top of plant. I think i have a good air circulating, have an extractor fan of 180 m3/h and a input fan of 107m3/h, also have one fan inside the tent, i think for a tent of 60x60x140 cm is good no?


Is it late to do the super croping? If it is not late, how long do I have to do it?

Dontjudgeme said:

Might be time to invest in a portable AC unit if the temps continue to be an issue. But even an AC won’t fix your vertically challenged tent, it’ll just drop the temp. I would consider a new tent to be honest.

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Thanks for reply, i have an a portable ac, but can't use. And also have a tent of 2,4x2,4x2m,but this was the one I used when I lived in a house, now I have moved into an apartment, and after talking to the woman, this was the maximum size that I let myself have, I think that in this you can do a indor perfectly, But it has been my first scrog, and varieties that I have never planted. For the next crop I will put the scrog 20cm from the pot, and before the plants reach the screen I will change to 12/12