How hot is to hot in Flower

[urbangroop]

I running 3 1000Watters in a coco scrog grow. I cant seem to get temps below 85 with A/C blasting. The room is Co2 enriched and stays at a mostly constant 1300ppm's humidity is under control as well.

Is there any experienced growers here who have ran high temps with co2 during flower? Could this affect yield or quality of finished product?

Thanks in advance!

 

[_tessarecting]

Depends on strain how much it will stress them out. Hope for the best and do all you can. Don't let your res get that high.

 

[urbangroop]

Looking for someone whos been in the same situation.

 

[_tessarecting]

How can we know what your situation is without knowing what strain it is?

I've had to deal with it. If your ac doesn't keep up you need to upgrade or shut down but you're already how far in? If you're near the end just finish it off. It affects yield and quality. Too high for too long you get whispy fox tails. Good luck.

 

[Miraculous Meds]

I intentionally run that hot. Although I think it might rob u of some terpenes come harvest time. U will definitely get increased yields with those parameters, as long as u have everything else in check.

general impression, less smell, more bud. Maybe shut down one of the 1k's the last week to get the temp drop and keep all the last week cannabinoids and terps fresh an in tact as possible. Im not a 100% positive that the high temp/rh take away the odor, but its been my experience so far with the hot rooms.

Probably a good idea to cut the co2 the last week or 2 as well.

 

[urbangroop]

hmmm ive been doing quite a bit of reading that says 85 is fine with a sealed co2 supplemented room. Ive yet to find any info that states yield or quality is affected.

 

[al70]

With co2,,,,,high 80s is fine, goodluck

 

[urbangroop]

Daytime conditions should be 70-80 degrees without co2, 80-90 degrees with co2 until the last two weeks when daytime temps should be kept between 70-80 and co2 can be reduced to adjust for the lower metabolism. Night temperatures should be kept above 60 degrees to prevent stress. It is preferrable during flowering to have a night temperature drop of 10-20 degrees to stimulate flowering hormones and reduce stem elongation.

I find that low humidity causes stress on plants. I recommend 50-60% humidity until the final 2 weeks of flowering. At this point, the humidity should be lowered as much as possible to encourage the plant to seal and protect itself with additional resin. (I am able to get the humidity to go as low as 31%) I have been able to frost things up considerably this way. The higher humidity levels prior to final ripening reduce salt levels within the plant tissue and encourage healthy, more lush growth.

Author: MisterIto


Found this

Thanks al70 thats what Ive been thinking

 

[stoned-trout]

I have run at 85 without any issues.. when it hits 90 s then things start going bad....yeehaw

 

[BuhBeeLawnFall]

For real.... 88+ is where ive had problems.
But, if you run an aquarium chiller on yer res, youre cool.

 

[urbangroop]

I have run at 85 without any issues.. when it hits 90 s then things start going bad....yeehaw

Yeah thats what I figured boy. What kinda problems are we talking about when temps get to high?

 

[Miraculous Meds]

Ur not really gonna have a prob at 90 with those co2 levels. Research vpd. if ur running 85f u should be around 70 to 75% rh. In these conditions with good air flow or air exchange, then u will have super rapid growth and bud development. But I am leaning towards what that guy u quoted was saying about dropping the temp and humidity at the end of flower.

Actually with co2 at ur levels, u wont experience the benefits unless u run a temp in the higher range like around 85f. The plants need the higher temp to utlize the extra co2.

 

[OldGuyInOregon]

For what it is worth... For flowers, I think over 90F lights on is not so bad, but over 80F lights off is bad juju whether you are running CO2 or not.


In your situation w/ 3 x 1,000 watts of HPS with CO2 min of 85F... If I did anything I'd try:


1. Dimming the bulbs down to 750 or 600 watts or even better swapping out for 600 watt bulbs if your ballast supports either of these options. Maybe you only have to dim part of the day to help.

2. Change the light schedule, so the AC is not fighting outside temps plus the lamps at the same time. You might be surprised at how much this can help.

3. Bring in more outside air (bigger or more fans, more inlets) whenever outside air is cooler than the grow room, even if that cuts into the CO2.


Good luck!

 

[vitamingreeninc]

Well the plants don't use the cO2 during lights out, and tbh, it's more of a sliding scale with the temp...you WILL see different expressions of your girls if you have a dark time temp that is 12 degrees or more of a difference than in your daylight temp...so if you have 90F during daylight, I honestly wouldn't want it to drop below 78-80 during night?

 

[Granger2]

Old Guy hit it with dimming bulbs to 600 to help with temps. I had a 600w HPS bulb fail on a crop once. Two 600s, 1 failed, dimmed ballast, put the only bulb I had, a 400w MH. It ran for 2 weeks [foul up of vendor shipping bulb] and this was weeks 7&8. I couldn't tell a difference in any factor. Same yield, quality, etc. Lower temps would allow you to cut CO2 in last weeks, which is preferable, and lower temps will help preserve terpenes in critical last 3 weeks rather than evaporating. Good luck. -granger

 

[OldGuyInOregon]

Well the plants don't use the cO2 during lights out, and tbh, it's more of a sliding scale with the temp...you WILL see different expressions of your girls if you have a dark time temp that is 12 degrees or more of a difference than in your daylight temp...so if you have 90F during daylight, I honestly wouldn't want it to drop below 78-80 during night?

I meant that I think 80F is too hot lights off whether or not one uses CO2 lights on.

I personally would prefer a 12+ degree temp swing rather than over 80F or maybe 82F at night. Neither situation is optimal.

 

[Miraculous Meds]

I meant that I think 80F is too hot lights off whether or not one uses CO2 lights on.

I personally would prefer a 12+ degree temp swing rather than over 80F or maybe 82F at night. Neither situation is optimal.

I don't get what the prob is being over 80 at night. imo the closer u r to day/night temps being the same, the more the plant grows. now im a believer in the last couple weeks dropping those temps to keep the volatile terps and cannabinoids that might be lost.

I guess what im asking is what negative effects happen because ur over 80f at lights off?

 

[Lapides]

I never ever let my flowering room get above 78F.

If you like your flowers to smell and taste amazing, you shouldn't either.

CO2 or not

 

[OldGuyInOregon]

I don't get what the prob is being over 80 at night. imo the closer u r to day/night temps being the same, the more the plant grows. now im a believer in the last couple weeks dropping those temps to keep the volatile terps and cannabinoids that might be lost.

I guess what im asking is what negative effects happen because ur over 80f at lights off?

I am not a growing expert, I am an electronics expert. Please accept my comments with that in mind.


1. You lose smell.
2. You lose taste.
3. You are greatly increasing you risk of mites and some other night-active pests because these explode around 85F (at least they have for me).
4. I think the plants like a good temperature swing and greater than 80F at night means you have to run 90F or better in the day.
5. If the lowest temp you every get is 80F or higher, and you have any temp problem in the day, then 80F at night might turn into min of 85F or more at night and then you are pushing things too much (IMO) with a night temp that high.

I think there are more reasons. I am not trying to argue with you, those are my opinions and I am trying to help. Peace!

 

[vitamingreeninc]

Plants do NoT like a huge temp swing, idk why you believe that?

I am not a growing expert, I am an electronics expert. Please accept my comments with that in mind.


1. You lose smell.
2. You lose taste.
3. You are greatly increasing you risk of mites and some other night-active pests because these explode around 85F (at least they have for me).
4. I think the plants like a good temperature swing and greater than 80F at night means you have to run 90F or better in the day.
5. If the lowest temp you every get is 80F or higher, and you have any temp problem in the day, then 80F at night might turn into min of 85F or more at night and then you are pushing things too much (IMO) with a night temp that high.

I think there are more reasons. I am not trying to argue with you, those are my opinions and I am trying to help. Peace!