Temps

[Grow big 3]

This is my first grow during winter months usually grow during spring and summer thought I would give winter a try but can anyone give some info on how low temperatures could effect my girls they experienced temps at 14 degrees one night they are in first week of flowering I heard that low temps can give buds some colour which would be nice but on the down side it could stress them enough to herme can anyone tell me if I'm at risk herme or not

 

[diggs99]

What type of lights are you growing with?

What are temps with lights on?

14 is low, but many have grown in colder spots and got to harvest.

 

[madvillian420]

14 c or f

 

[RangiSTaxi]

As a plant cannabis does not like cold temperatures, at all, it can handle very high temperatures but does not do well with cold at all, the colour in cold temps is the green chlorophyll breaking down exposing reds and purples like the fall/autumn TREES BEFORE DORMANCY, WINTER , this is not good at all.

your temps should not drop below 18 degrees c at night , ( 65 F)

 

[Grow big 3]

Temps with lights on usually stays around 23-25 lights are 14 f put a small heater with them temps around 18 19 now with lights of just hope that one night of low temps didn't stress them to much

 

[RangiSTaxi]

Temps with lights on usually stays around 23-25 lights are 14 f put a small heater with them temps around 18 19 now with lights of just hope that one night of low temps didn't stress them to much

USE A HEAT MAT, the most important thing is to keep the roots warm and active.

 

[Grow big 3]

Thanks for the input guys will get on the ball pronto talk later

 

[RangiSTaxi]

USE A HEAT MAT, the most important thing is to keep the roots warm and active.

if you have a tent you can use a electric bed blanket under it on a low setting. (becareful of water obviously)

 

[Grad3sp3cialist]

14 c it starts slowing down growth.. any lower and the plant can die

 

[BenGman]

I pulled 3 pounds of indica Dom in a 4x8 with temps similar to yours if not sometimes colder , all through flower and it was killer bud with no issues or delays at all. It was actually one of my best grows last year...go figure. ( See close up on plant getting purple from cold temps)

 

[Renfro]

If using LED you want warmer canopy temps than with HPS due to the LED lacking infrared wavelength to warm the leaf surface temps. With LED I want canopy temps around 85F and with HPS more like 80F (those are with CO2 at 1000 - 1200 PPM).

If you let the roots get cold it will slow growth and limit yields. Cool night temperatures are a limiting factor as when the plants have warmer nights with ample water and they had ideal conditions during the day they will grow at night. What substitutes for light are the sugars the plant synthesised from the day before and stored specifically for use at night.

Also allowing night temps to drop will spike humidity levels and when your biomass hits a critical level you will likely end up with issues like powdery mildew.

If it were up to me I would do what is required to make sure the day canopy temps are good for my lighting and the night temps stay above 72F.

 

[diggs99]

If using LED you want warmer canopy temps than with HPS due to the LED lacking infrared wavelength to warm the leaf surface temps. With LED I want canopy temps around 85F and with HPS more like 80F (those are with CO2 at 1000 - 1200 PPM).

If you let the roots get cold it will slow growth and limit yields. Cool night temperatures are a limiting factor as when the plants have warmer nights with ample water and they had ideal conditions during the day they will grow at night. What substitutes for light are the sugars the plant synthesised from the day before and stored specifically for use at night.

Also allowing night temps to drop will spike humidity levels and when your biomass hits a critical level you will likely end up with issues like powdery mildew.

If it were up to me I would do what is required to make sure the day canopy temps are good for my lighting and the night temps stay above 72F.

just curious and i think you told me before, what temps and rh do you keep your drying room at?

 

[DailyBlastin]

If using LED you want warmer canopy temps than with HPS due to the LED lacking infrared wavelength to warm the leaf surface temps. With LED I want canopy temps around 85F and with HPS more like 80F (those are with CO2 at 1000 - 1200 PPM).

not sure what LEDs you use but most reputable brands have IR diodes... i use Advanced Platinum LEDs and every model they offer includes IR, i run my lights at night so my "daytime" temps are 75-80 and "nighttime" temps at 65-70, my plants love it.

 

[Renfro]

just curious and i think you told me before, what temps and rh do you keep your drying room at?

It's usually pretty dry, like around 30 - 35% RH and in the mid to upper 70's in the summer and low to mid 60's in the winter. I don't do anything in there but run a ceiling fan and the carbon filter. The ambient RH% is so low here that once the weed is dry the RH% drops into the 20's. So my weed dries in about 6 - 8 days and is very dry. Makes for a super easy dry trim, no chance of mold. Once bagged I often add back just a little moisture with fresh fan leaves and integra boost packs to get it just right so it won't turn to powder in the bags.

 

[Flatrate]

just curious and i think you told me before, what temps and rh do you keep your drying room at?

Thanks diggs for asking this question.

It's usually pretty dry, like around 30 - 35% RH and in the mid to upper 70's in the summer and low to mid 60's in the winter. I don't do anything in there but run a ceiling fan and the carbon filter. The ambient RH% is so low here that once the weed is dry the RH% drops into the 20's. So my weed dries in about 6 - 8 days and is very dry. Makes for a super easy dry trim, no chance of mold. Once bagged I often add back just a little moisture with fresh fan leaves and integra boost packs to get it just right so it won't turn to powder in the bags.

Thanks Renfro for answering. You just answered something for me that I have been thinking about. What % are the Integra packs you use?

 

[Renfro]

What % are the Integra packs you use?

62

 

[DailyBlastin]

Just wanted to add to this discussion, i live in a more humid climate so in my dry chamber i usually have around 40% rh, takes a few extra days to dry but i prefer a nice slow dry personally, i found though that when i cured with 62% boveda packs it would typically stay a bit wetter than i like, hygrometer would read 64% even after a solid month cure with plenty of burping, i switched to 58% boveda packs and now i get a nice 60% reading on every jar

 

[Flatrate]

My led light don't have IR diodes, guess I need to to get something more reputable!

 

[DailyBlastin]

My led light don't have IR diodes, guess I need to to get something more reputable!

what are you using? Cheap chinese lights typically dont have IR and if they do advertise it i still wouldnt trust that it does. As the Quantum Boards have been gettting more popular ive been looking at them but i havent seen any that specify IR diodes in their build, top dollar brands like Advanced Platinum and Kind LED all have them though, i know we all like to save money but lights are one thing you should never cheap out on.

 

[diggs99]

Ill take HLG, or any other white led fixtures over anything advanced or kind has ever made.....you called it, top DOLLAR brands,, top of the expensive pile, not even mentioned when talking about quality or cost

Flatrate is running a Timber fatty, he dont need to "upgrade" to AP or KIND , hes already rockin much better.