Temps TOO Low? First Time Help IN FLOWERING

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steved3g

Member
I live in the mountains of Colorado. Temps outside get into the single digits at night. I'm having a tough time keeping my night temps in my grow room above 60 degrees F. It has fallen to 50 a few times the last 4 days. It stays around 75 during the day. The grow rooms is in the attached garage, where it never reaches freezing temperatures, but falls into the 40s. Growing in Fox Farm soil and using the Dirty Dozen nute set up at half strength. The only thing I'm seeing off is slight nute burn on the older fan leaves, which I suspect because I used full strength nutes just once when I transitioned into flowering, and occasionally a dead leaf in the pot. There is no purpling or PM, although I did have it during the veg stage and eradicated it with a few neem oil applications. My question is, should I move another heater into the grow tent? Or do my girls look ok? Is 50 to 55 degrees (what I can hold stable now) going to kill my plants or otherwise affect yield dramatically?

Note: running a 3000w and a 1000w led light. 4000w totals (around 1000w actual consumption.
 

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CountryFriedPotHead

CountryFriedPotHead

Well-Known Member
steved3g said:
I live in the mountains of Colorado. Temps outside get into the single digits at night. I'm having a tough time keeping my night temps in my grow room above 60 degrees F. It has fallen to 50 a few times the last 4 days. It stays around 75 during the day. The grow rooms is in the attached garage, where it never reaches freezing temperatures, but falls into the 40s. Growing in Fox Farm soil and using the Dirty Dozen nute set up at half strength. The only thing I'm seeing off is slight nute burn on the older fan leaves, which I suspect because I used full strength nutes just once when I transitioned into flowering, and occasionally a dead leaf in the pot. There is no purpling or PM, although I did have it during the veg stage and eradicated it with a few neem oil applications. My question is, should I move another heater into the grow tent? Or do my girls look ok? Is 50 to 55 degrees (what I can hold stable now) going to kill my plants or otherwise affect yield dramatically?

Note: running a 3000w and a 1000w led light. 4000w totals (around 1000w actual consumption.
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Im sure there will be other people with better advice and more experience to chime in, but from what I think I know. Low temps in the 50’s are okay during the last bit of flower, and help form the nug density most growers desire. Low (night) temps in the last part of flower can also cause the plants terpene profile to really blossom as well as possibly increase color hues If the specific pheno allows for such.
 
CountryFriedPotHead

CountryFriedPotHead

Well-Known Member
steved3g said:
Thank you. I'm not far into flowering, only on day 29. What do you mean by last 'part of flowering'?
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Last 2 weeksz. Ive never done myself, just things I may have seen between different forums and videos. It may not even be spot on advice, but generally it is correct info.
 
CanadianJim

CanadianJim

Well-Known Member
I would only be worried about it taking a little longer to finish. I wouldn't worry too much unless your temps stay low when the lights are on, as that could interfere with photosynthesis.
Plants in your pic look happy to me.
 
Chip Green

Chip Green

Well-Known Member
I grow in suspect conditions in Da UP of MI, been in the same situation every year at this time....it's not ideal if course, but it's not going to cause catastrophe. I've actually found certain genetics ripened slightly quicker with the sub 60F "nights".
Yield wise, the warmer months get a slight uptick, but it was really without consequence...for me anyway.
 
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steved3g

Member
Thanks for the responses. My only worries now is the bushiness. I did a pre-flower trim, but still not a lot of light hitting what's left of the bottom branches and leaves. Lots of leaves dying on the very bottom. Not a huge concern since all of the growth getting light looks fine except for some nute burn on the oldest fan leaves. Is there a way to keep the lower growth from dying out? It's about 2 leaves a day from each plant.
 
a mongo frog

a mongo frog

Well-Known Member
steved3g said:
I live in the mountains of Colorado. Temps outside get into the single digits at night. I'm having a tough time keeping my night temps in my grow room above 60 degrees F. It has fallen to 50 a few times the last 4 days. It stays around 75 during the day. The grow rooms is in the attached garage, where it never reaches freezing temperatures, but falls into the 40s. Growing in Fox Farm soil and using the Dirty Dozen nute set up at half strength. The only thing I'm seeing off is slight nute burn on the older fan leaves, which I suspect because I used full strength nutes just once when I transitioned into flowering, and occasionally a dead leaf in the pot. There is no purpling or PM, although I did have it during the veg stage and eradicated it with a few neem oil applications. My question is, should I move another heater into the grow tent? Or do my girls look ok? Is 50 to 55 degrees (what I can hold stable now) going to kill my plants or otherwise affect yield dramatically?

Note: running a 3000w and a 1000w led light. 4000w totals (around 1000w actual consumption.
Click to expand...
Yea 50's and 60's should be super bad conditions. But your plants look beautiful, I would think you would be stunted. But day 29 your garden looks flawless. Then again 75 with lights on is great. Nice work!
 
Gentlemencorpse

Gentlemencorpse

Well-Known Member
So I grow in a basement in the northeast and my tent also drops into the mid 50s during the dark cycle this time of year, and as others have said, it's usually not a big deal. At least for my soil grows. Yield suffers a little bit but nothing too crazy.

Also the lower leaves always die on my plants as it gets closer to harvest time. It's just a natural part of the plants cycle. I wouldn't worry to much about it.
 
xtraLRG420

xtraLRG420

Well-Known Member
I had low temps all through veg with one night actually showing 32° because I fell asleep with my window open. All I did the next morning was spray them with water and turn the heater on and they bounced back in less than an hour. As far as I'm concerned weed isn't afraid of no damn frostbite. It's excessive heat you gotta worry about.
 
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