Humidity issues at night! Afraid it might ruin my buds.... HELP!!

A

AlChemist333

Active Member
Jimdamick said:
Don't waste your time, total bullshit
You have no issues, just water/feed on schedule.
you'll be fine :)
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Ok I’ll keep at it. I don’t have much time left on this grow and they don’t seem to be having many issues besides controlling humidity. I just wanted to increase the resin production. Right now I’m just worried about smell and taste. Only smell them when I touch the buds and smell my fingers but no loud smell reeking through tent. Unless the carbon filter dehumidifiers are doing well with decreasing smell.
 
Star Dog

Star Dog

Well-Known Member
AlChemist333 said:
Humidity outside my grow tent is usually around 62-63% and temp I keep around 70 degrees, Im going to try place my mini dehumidifiers outside my tent near the intake fan and see if that helps first. If not I’ll buy a bigger dehumidifier for the outside of my tent since I’m using one of my rooms.
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There's your problem, your bringing in air that's already heated and has a rh of say 60% into a tent with plants breathing out moisture, i pretty much agree 100% with jimdamicks advice just keep airflo.

The mini dehums aren't very good you need a proper dehum to lower the rh that'll also create some heat in the tent/room.

Fwiw it's normal to be on edge if you don't have experience you read that much junk you end up paranoid about rot.
 
A

AlChemist333

Active Member
Star Dog said:
There's your problem, your bringing in air that's already heated and has a rh of say 60% into a tent with plants breathing out moisture, i pretty much agree 100% with jimdamicks advice just keep airflo.

The mini dehums aren't very good you need a proper dehum to lower the rh that'll also create some heat in the tent/room.

Fwiw it's normal to be on edge if you don't have experience you read that much junk you end up paranoid about rot.
Click to expand...
Ok cool. I only purchased the mini dehumidifiers because I have a 4x4 tent and a larger one won’t fit. I can barely find space for the two small ones i have. I have one on the floor of the tent and one on a mini shelf I have for my shorter plants.
 
Keesje

Keesje

Well-Known Member
There are many ways to grow plants.

72-74 with lights on is not high.
67-69 with lights out is not high as well.
If you would raise both temperatures you will see that you RH will go down.

People saying that a certain humidity is good, without looking at the temperature, do not understand RH and VPD.
60% RH with 70 degrees is totally different from 60% RH at 80 degrees.

But even with your temperatures your humidity should be ok.
What can happen though, is that the moment your lights turn on, your buds will stay cold while your ambient temp is rising.
This can cause dew on your buds.
Mildew and botrytis (bud rot) are fungi. They need wet plants. It is not the water that causes the fungi; the water is a catalyst.

You can remove leaves from plants.
Commercial growers with tomatoes do this all the time.
If leaves absorb a lot of light, they are beneficial to the plant. If they do not absorb light and they take more building blocks then they produce, you can sometimes remove them.
But realize that when your plants are not in top condition, it will be another wound on the plants, thus more change for disease.
 
A

AlChemist333

Active Member
Keesje said:
There are many ways to grow plants.

72-74 with lights on is not high.
67-69 with lights out is not high as well.
If you would raise both temperatures you will see that you RH will go down.

People saying that a certain humidity is good, without looking at the temperature, do not understand RH and VPD.
60% RH with 70 degrees is totally different from 60% RH at 80 degrees.

But even with your temperatures your humidity should be ok.
What can happen though, is that the moment your lights turn on, your buds will stay cold while your ambient temp is rising.
This can cause dew on your buds.
Mildew and botrytis (bud rot) are fungi. They need wet plants. It is not the water that causes the fungi; the water is a catalyst.

You can remove leaves from plants.
Commercial growers with tomatoes do this all the time.
If leaves absorb a lot of light, they are beneficial to the plant. If they do not absorb light and they take more building blocks then they produce, you can sometimes remove them.
But realize that when your plants are not in top condition, it will be another wound on the plants, thus more change for disease.
Click to expand...
the Highest the temp gets in my tent today is about 77-78 and I do see a huge drop in humidity. Mainly around 49-52% humidity but that’s only with lights on. When lights are off, temp drops to about 69 degree and the humidity goes up to about 58%-60%. Last night is the first seeing the humidity increase to about 62-63%. The constant fluctuations are concerning me. I don’t want to stress the plants that much this last in flower.
 
A

AlChemist333

Active Member
AlChemist333 said:
the Highest the temp gets in my tent today is about 77-78 and I do see a huge drop in humidity. Mainly around 49-52% humidity but that’s only with lights on. When lights are off, temp drops to about 69 degree and the humidity goes up to about 58%-60%. Last night is the first seeing the humidity increase to about 62-63%. The constant fluctuations are concerning me. I don’t want to stress the plants that much this last in flower.
Click to expand...
During the day* not today
 
A

AlChemist333

Active Member
Keesje said:
There are many ways to grow plants.

72-74 with lights on is not high.
67-69 with lights out is not high as well.
If you would raise both temperatures you will see that you RH will go down.

People saying that a certain humidity is good, without looking at the temperature, do not understand RH and VPD.
60% RH with 70 degrees is totally different from 60% RH at 80 degrees.

But even with your temperatures your humidity should be ok.
What can happen though, is that the moment your lights turn on, your buds will stay cold while your ambient temp is rising.
This can cause dew on your buds.
Mildew and botrytis (bud rot) are fungi. They need wet plants. It is not the water that causes the fungi; the water is a catalyst.

You can remove leaves from plants.
Commercial growers with tomatoes do this all the time.
If leaves absorb a lot of light, they are beneficial to the plant. If they do not absorb light and they take more building blocks then they produce, you can sometimes remove them.
But realize that when your plants are not in top condition, it will be another wound on the plants, thus more change for disease.
Click to expand...
I would think I want low humidity at night since this is when the plant uses the energy/food stored from photosynthesis. Low humidity at night means more resin productions for this stage of flower. So I was concerned that the constant fluctuations will cause problems. And stress them out. However this is my very first grow and every little thing I notice seems to worry me lol
 
Jimdamick

Jimdamick

Well-Known Member
AlChemist333 said:
I’ll buy a bigger dehumidifier for the outside of my tent
Click to expand...
I'll say this once again.
You do not have a humidity problem.
Chill out
I've grown with 80% humidity with very few problems, once in a while with very dense colas, some slight damage from bud rot.

Nice.JPG

Save the money for good seeds & don't waste it on a non-existant problem.
 
Last edited:
A

AlChemist333

Active Member
Jimdamick said:
I'll say this once again.
You do not have a humidity problem.
Chill out
I've grown with 80% humidity with very little problems with only slight damage from bud rot.

View attachment 4683292

Save the money for good seeds & don't waste it on a non-existant problem.
Click to expand...
I saw you told me that I didn’t need one after I sent that. So I’ll save the money and finish this grow. Your plants like nice btw. I mine would have budded up that much. But then again it could have been the seeds. I used some I saved so genetics may not have been that great. I was expecting much fatter buds.
 
A

AlChemist333

Active Member
Keesje said:
Your humidity at night is not higher. Your relative humidity is higher. That is a difference. But your VPD is probably the same.
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Ok well sounds like I need to do some reading to understand humidity, relative humidity and temperature. Learned about it in a college but definitely have forgotten a lot of it. Thanks for the advice.
 
Star Dog

Star Dog

Well-Known Member
I never thought earlier... To put it simple you need the same heat when the light is out to maintain the same rh...
 
Star Dog

Star Dog

Well-Known Member
AlChemist333 said:
Ok well sounds like I need to do some reading to understand humidity, relative humidity and temperature. Learned about it in a college but definitely have forgotten a lot of it. Thanks for the advice.
Click to expand...
Basically rh is a measure of the % of water saturation in the air at a given temperature, the humidity or water saturation % is directly related to its temperature, so as an example air at 8c can only absolute maximum hold 8 grams of water per m3, if you heat air to 25c it can hold 32 grams of water absolute maximum per m3 or 100% relative humidity/total saturation, so humidity is directly relevant to temperature.
Hth
 
A

AlChemist333

Active Member
Star Dog said:
I never thought earlier... To put it simple you need the same heat when the light is out to maintain the same rh...
Click to expand...
How would you go about doing that? Putting a heater in there at night will only raise the temp but of course lower the humidity. What do you suggest the solution is to this problem? Although, a couple of guys in the thread said I should be fine with the way things are. I just gave them a quick check. They look ok but at week 9 they still seem to be fattening and trichomes are still clear. Doesn’t look to be any stress or damage.
 
Star Dog

Star Dog

Well-Known Member
AlChemist333 said:
How would you go about doing that? Putting a heater in there at night will only raise the temp but of course lower the humidity. What do you suggest the solution is to this problem? .
Click to expand...
Lol welcome to indoor growing issues, ime what happens inside is dictated by the weather outside its quite a novelty for me to have ideal temps and rh basically outside the summer I'm fighting humidity or cold I don't believe there is a solution without burning money.

I've got to clear that I agree with the guys that suggested it'll be OK, the reply was more to give a little understanding of rh% take jimdamicks advice and chill you'll be OK.
 
A

AlChemist333

Active Member
Star Dog said:
Lol welcome to indoor growing issues, ime what happens inside is dictated by the weather outside its quite a novelty for me to have ideal temps and rh basically outside the summer I'm fighting humidity or cold I don't believe there is a solution without burning money.

I've got to clear that I agree with the guys that suggested it'll be OK, the reply was more to give a little understanding of rh% take jimdamicks advice and chill you'll be OK.
Click to expand...
trust I have been burning unnecessary money and it has been so irritating especially when I’m dealing with the same issues lol. But I’m glad I brought it to you guys, now I can relax and just wait it out lol
 
xtsho

xtsho

Well-Known Member
Jimdamick said:
I'll say this once again.
You do not have a humidity problem.
Chill out
I've grown with 80% humidity with very little problems with only slight damage from bud rot.

View attachment 4683292

Save the money for good seeds & don't waste it on a non-existant problem.
Click to expand...

I've done it with no bud rot.

And with only an exhaust fan pulling air through the tent.

Many people fan air on their plants thinking it does anything for mold or budrot. It helps but not much. The best thing is constant air exchange.

I run negative pressure and no fans inside the tent. Filtered bottom 4" vents on three sides. Air is extracted through a 6" carbon filter located at the top of the tent. All air that enters the tent comes from the 3 filtered vents at the floor. All are filtered identically so that I get airflow from multiple locations.

Intake is as important as exhaust. You can have multiple intakes but if there is a path to least resistance then that's the path the air will travel. Etc...

Airflow is key. Which comes back to environment being the major factor in a successful grow and my usual rant about how cannabis specific nutrients are a waste of money.

Slapping myself while telling myself to shut up.

Ouch!
 
Star Dog

Star Dog

Well-Known Member
If i haven't already said it I did mean to earlier, I've had less hassle with bud rott growing without heaters in the uk than I have using large fans heater and dehum, I did always have a decent fan pulling air through.
 
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