65 F too low for night time temps grow tent?

whitebb2727

whitebb2727

Well-Known Member
chooselove said:
thanks, below 60 dangerous?
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No. Main thing is don't let the roots get cold. The reason outdoor pot can handle cool weather and even light frosts is the roots being in the ground. Keeps them cool in the summer and warm in the fall.

Much below 60 and you will start seeing colors and even lock out of certain nutes.
 
greg nr

greg nr

Well-Known Member
My tent will drop to the mid to high 50's at night in the winter. I run a small space heater to keep it in the high 60's/low 70's. That's more for humidity control than temp though. There will be a slick of water on the tent walls in the morning if I don't.
 
since1991

since1991

Well-Known Member
The first few weeks of flower...if you can get lights off temp within 5 to 7 degrees +/- of peak lights on temps...your plants more than likely stretch way less. Strain depending of course but its quite effective most of the time. Called the temperature differential or temp "diff". On old veggie/fruit and flower greenhouse agricultural operations trick. They been using crop "steering" techniques like this for a long time.
 
chooselove

chooselove

Active Member
since1991 said:
The first few weeks of flower...if you can get lights off temp within 5 to 7 degrees +/- of peak lights on temps...your plants more than likely stretch way less. Strain depending of course but its quite effective most of the time. Called the temperature differential or temp "diff". On old veggie/fruit and flower greenhouse agricultural operations trick. They been using crop "steering" techniques like this for a long time.
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Very interesting fact that I also came across earlier today. Aka the Negative differential right.

Side question trying to decide between 3 and 5 gallon pots in a 5x9 tent using 4x4 flood trays. Prefer harvesting sooner than later so I'm leaning towards the 3's. I think my tent height is 7 feet or so as well.
 
since1991

since1991

Well-Known Member
chooselove said:
Very interesting fact that I also came across earlier today. Aka the Negative differential right.

Side question trying to decide between 3 and 5 gallon pots in a 5x9 tent using 4x4 flood trays. Prefer harvesting sooner than later so I'm leaning towards the 3's. I think my tent height is 7 feet or so as well.
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What is your medium? Peat based mix..coco coir?? I can pretty much say that 3 gallon pots (especially the fabric root pruning pots) are plenty for most tent grows. With the fabric pots though...they usually have several brands at the hydro shop and your gonna find that one brands 3 gallons isnt the same as anothers. Aurora pots (the grey fabric ones) are the cheapest but nowhere near the same size gallon wise as...say... Geopot or SmartPots. They all work a charm though. Especially for coco coir and peat mixes. The plant roots stay in the sweet spot of the medium (the middle) instead of circling around towards the bottom sides of a traditional plastic pot of the same size. With a fabric root pruning pot...you can use a pot thats 2/3 to 1/2 the size of what you would use plastic pot. And still pull off the same sized healthy plant. And you use less expensive medium. I started using fabric pots years ago and I never looked back at traditional plastic pots.
 
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ANC

ANC

Well-Known Member
Watering with cold water can also colour up plants with the right phenos.
I just did an outdoor winter grow, only certain plants within a few feet of the others went purple.
Others stayed green with white hairs.
If they don't have colour in the genes, you will just get purple leaf stems.
 
chooselove

chooselove

Active Member
since1991 said:
What is your medium? Peat based mix..coco coir?? I can pretty much say that 3 gallon pots (especially the fabric root pruning pots) are plenty for most tent grows. With the fabric pots though...they usually have several brands at the hydro shop and your gonna find that one brands 3 gallons isnt the same as anothers. Aurora pots (the grey fabric ones) are the cheapest but nowhere near the same size gallon wise as...say... Geopot or SmartPots. They all work a charm though. Especially for coco coir and peat mixes. The plant roots stay in the sweet spot of the medium (the middle) instead of circling around towards the bottom sides of a traditional plastic pot of the same size. With a fabric root pruning pot...you can use a pot thats 2/3 to 1/2 the size of what you would use plastic pot. And still pull off the same sized healthy plant. And you use less expensive medium. I started using fabric pots years ago and I never looked back at traditional plastic pots.
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Thanks... Doing organic soil Fox farms and definitely with the fabric pots
 
since1991

since1991

Well-Known Member
It sure is. Soil/medium/substrate temp is very overlooked. And outdoors with black plastic pots or indoor hydroponics (water temps) especially. Too warm you got problems. Too cold..growth slows to a crawl. Anyone thats stuck thier hand in an unused portion of a bag of perlite in an otherwise cold room the bag of perlite was in will know. Insulator is an understatement.
 
vostok

vostok

Well-Known Member
ANC said:
When you are growing in the cold, make sure to lift or otherwise isolate your pots from the ground.
It is a great time of year for doing aero.
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or better use a bigger pot...

like 2-3 times bigger than what you'd normally use

insulation does work
 
kingzt

kingzt

Well-Known Member
Keep an eye out for mold or pm if your temperature difference is too high. Pm loves temps swings if your rh isn't in check when it gets that cold when your lights are off.
 
since1991

since1991

Well-Known Member
kingzt said:
Keep an eye out for mold or pm if your temperature difference is too high. Pm loves temps swings if your rh isn't in check when it gets that cold when your lights are off.
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Yep. Ive had p.m. twice in the last 8 years or so. Both were new basements rental home ops in town. Both had wildly fluctuating relative humidity numbers amd temps. All over the place. Sure as shit...p.m. Crept its ugly head. Not on my mother stock upstairs though. Since then I bought a sante fe classic dehuey/mitsu mr. Slim split and iam all good. This was awhile back. And those 2 appliances were the biggest investment and the best...by far. Damn the lights. Thats easy. Its real commercial grade dehueys and mini splits that allowed me to do things in the growroom I'd only heard or read about.
 
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