when is cold too cold?

Do you think 55-60 is too cold for flower?

  • Yes

    Votes: 32 74.4%
  • No

    Votes: 11 25.6%

  • Total voters
    43

unwine99

Well-Known Member
There is optimum temps of course.

My personal experience tells me a few things. I cut my teeth outdoors guerilla growing brick seeds. A lot of sativa's. Most have handled cold weather just fine, even in the 20's.

Do I think you need to grow in cold conditions? No. I do however think that cold spells effect the buzz. I personally think bud that has been hit by cold has a better buzz.

50's at night wouldn't worry me a bit. I've seen many a plant keep a trucking in colder temps.

Another thing is how fast they warm up with lights on.

I agree that cannabis has optimum temps to grow in. I'm also saying don't discredit the positives that cold imparts on cannabis.

No plant that has endured twenty degree weather and 'multiple hard frosts' during early to mid flower is going to be something that I'm going to smoke, period -- especially a sativa, which often tend to be leafier anyway. I grow for high-grade buds, not trich'd out leafy crapola.

If you or others enjoy the high from buds (if you can call them that) grown in cold weather, fair enough, but the final product isn't going to something harvested from a plant that has lived up to its full potential.
 

Budley Doright

Well-Known Member
A warmer air is a drier air because it is capable of holding more humidity. A colder air is a moister air because it takes less moisture to create a more humid environment.

That being said, I run a 70% humidity at the seedling stage because the plants will transpire less volume as they are smaller. Max volume for the plant, less volume for the room.

As they grow and the plants become bigger, they transpire more by volume. That's when I drop the room humidity down to around 40-50%. The RH of the room will remain at 70% because of transpiration. The plants alone are producing 10-20% (sometimes up to 30% depending on how many plants such as perpetual growing).

So if I took all the plants out of the room, humidity would drop by up to 30%. I will demonstrate this when they get bigger.

That means I am pushing those plants to max transpiration rates which increases all other production (photosynthesis and respiration).

Imagine it's 30 out and you are standing still. It's cold, right? Now imagine you're running a marathon in the same temp. You're going to sweat, right? Now how in the hell can you sweat and be warm in that cold of temps?

Plants are the same way. Just because they don't physically move, does not mean they are not working. They are running that marathon which increases their metabolism and all other plant functions.

Humidity is not the only factor alone. It requires a steady breeze to remove the boundary layer under the leaves to increase transpiration. It also requires light. Just because the room temp is 33 or 40 or 55, the canopy only, is warmed up from the lighting. My canopy is around 70-75 degrees in a 50-55 degree environment. That keeps the air dense and rich with oxygen and CO2, and the stomata wide open whenever the lights are on... Which allows them to transpire at max rate, increase photosynthesis to max, and increase respiration to max.
Canopy? All I've seen are little seedlings, where is the canopy? Have you any pics of mature plants? Any pics of finished plants? I'm Canadian so trying to be polite here Rex but come on. I get the "I have to use what I got" thing cause I've been there but you are losing out on yield by not providing optimal conditions. Yes you can grow plants in colder temps but not to their full potential. There are many things that effect a plant but keeping temps at optimal levels is key. And I gotta say the canopy thing came in kinda late huh, with a fan blowing on your plants you are able to achieve a 15- 20 degree difference, how pray tell. This just seems like you got called out and now trying to get the hell out of a giant shit storm lol. Good luck with that, and may it soon end lol. I do appreciate your willingness to try new things though and as for the light thing, did it, didn't like it as my plants seemed to stretch more but only did it once years ago after reading about it in a poinsettia article.
 

2ANONYMOUS

Well-Known Member
Yeah lol i always wondered why Sativa strains grown near the Equator where its obviously also warmer tend to have Higher THC percentages then there cousins Indica's ???
yields are bigger, plants are bigger what gives ???

Rex ??? would really love your professional opinion
 

whitebb2727

Well-Known Member
No plant that has endured twenty degree weather and 'multiple hard frosts' during early to mid flower is going to be something that I'm going to smoke, period -- especially a sativa, which often tend to be leafier anyway. I grow for high-grade buds, not trich'd out leafy crapola.

If you or others enjoy the high from buds (if you can call them that) grown in cold weather, fair enough, but the final product isn't going to something harvested from a plant that has lived up to its full potential.
Fair enough. I'm telling you some of the best bud I've had has been in cold weather. A pure sativa at that. It looked like any other sativa. It had large spear head buds on it. Nowhere did I say early flower. I'm I'm not saying full on cold all flower. Preferably at the last two weeks when putting on weight.

Cold weather won't cause leafy or spindly buds. Actually the opposite. Cooler temps cause hard nugs. Indica, cold climate cannabis, hard nugs. Sativa, warm climate spindly, foxtailed buds.

Yeah lol i always wondered why Sativa strains grown near the Equator where its obviously also warmer tend to have Higher THC percentages then there cousins Indica's ???
yields are bigger, plants are bigger what gives ???

Rex ??? would really love your professional opinion
Uh, no. Sativa's are not known for weight. Indica's are. That's why people made hybrids. To increase weight and shorten flowering times of sativa.
 

nomofatum

Well-Known Member
Yeah lol i always wondered why Sativa strains grown near the Equator where its obviously also warmer tend to have Higher THC percentages then there cousins Indica's ???
yields are bigger, plants are bigger what gives ???

Rex ??? would really love your professional opinion
Check out a map of the highest THC landrace strains. Then also check a map showing average UVB dose by location. You will see the highest THC comes from the highest UVB dose. That means either closer to equator or higher in altitude. Potency isn't really driven by temps that much, more by the light, genetics, and nutrient availability.

The correlation you are finding is partially true because more light typically means more heat... but not always, as example being the highest THC landrace is from the Hindu Kush Mountains, not death valley or even a tropical island directly on the equator.
 

unwine99

Well-Known Member
Fair enough. I'm telling you some of the best bud I've had has been in cold weather. A pure sativa at that. It looked like any other sativa. It had large spear head buds on it. Nowhere did I say early flower. I'm I'm not saying full on cold all flower. Preferably at the last two weeks when putting on weight.

Cold weather won't cause leafy or spindly buds. Actually the opposite. Cooler temps cause hard nugs. Indica, cold climate cannabis, hard nugs. Sativa, warm climate spindly, foxtailed buds.
I don't think anyone is arguing against inducing cold temperatures after bud formation and maturity, watering with ice water and so forth -- I know quite a few people who do this for color and bag appeal -- that's a different topic altogether.

Low temperatures during flowering onset, formation, and into maturity is a different story -- it inhibits all of those things, resulting in a less than desirable product -- unless of course you prefer leafiness with poor bud development.
 

Budley Doright

Well-Known Member
I know I dread cold here outdoors near the end. The buds have a tendency to rot :(, some strains more than others but it's a big problem. Lost a few crops to it or pulled early. This thread is if nothing else entertaining lol.
 

2ANONYMOUS

Well-Known Member
You got it all wrong bud

https://budgenius.com/Hindu-Kush-Kern-River-Collective-BG0010001E647.html

i mean we can get into the hazes sativa strains that are over 21 percent THC
breeders tend to stabilize by adding indica's to which ever final goals they are trying to achieve
From less flower time , less stretch to shorter control able plants
But today with the basterdization of the gene pool we are left with very few Sativa's and indica's in original form Yes even trying to find a original land race unless you know a farmer in Jamaica chances are you will get a hybrid strain not a orginal land race but a mix
 

nomofatum

Well-Known Member
You got it all wrong bud

https://budgenius.com/Hindu-Kush-Kern-River-Collective-BG0010001E647.html

i mean we can get into the hazes sativa strains that are over 21 percent THC
breeders tend to stabilize by adding indica's to which ever final goals they are trying to achieve
From less flower time , less stretch to shorter control able plants
But today with the basterdization of the gene pool we are left with very few Sativa's and indica's in original form Yes even trying to find a original land race unless you know a farmer in Jamaica chances are you will get a hybrid strain not a orginal land race but a mix
Lol, why show a lab report for what someone sent in labeled "Hindu Kush", do you know how many different places call different strains Hindu/Kush or variations, a shit-ton. Hindu Kush is the most popular landrace because it is both very potent and very tasty, it is also an ancestor to 99.9% of all the hybrid strains available today.

It's the most potent landrace, we took the best landrace strains and worked or breeding magic to surpass all the landrace strains by a mile.
 

2ANONYMOUS

Well-Known Member
To say hindu kush is most popular rings hollow its proven fact Sativa's have the most THC and lower CBD then there cousins up North where Indica's have higher CBD then there counter parts down south

Here is a ancestor to pretty much EVERY strain on the market today orginal Afganistan kush ,,
Da same dam thing i have had since 1978 thanks to immigration:) Your Hindu kush is just a fancy name that ken from sensi seeds named it and yes its a good stable line that is true breeding characteristics.. only diference is i know mine is real aganistan who da hell knows if the so called seeds people get are true if you catch my drift :) nice short bushy babies that grow around 5 - 6 feet tops :)Afganstan.jpg
 

nomofatum

Well-Known Member
To say hindu kush is most popular rings hollow its proven fact Sativa's have the most THC and lower CBD then there cousins up North where Indica's have higher CBD then there counter parts down south

Here is a ancestor to pretty much EVERY strain on the market today orginal Afganistan kush ,,
Da same dam thing i have had since 1978 thanks to immigration:) Your Hindu kush is just a fancy name that ken from sensi seeds named it and yes its a good stable line that is true breeding characteristics.. only diference is i know mine is real aganistan who da hell knows if the so called seeds people get are true if you catch my drift :) nice short bushy babies that grow around 5 - 6 feet tops :)View attachment 3588049
Afgan Kush = Hindu Kush, different name for same strain. Hindu Kush Mountains are in Afgan.
 

Dr. Who

Well-Known Member
Yet you discredit the formula for photosynthesis that doesn't require temp? But I'm supposed to accept this chart?

Being picky on which info you want to be relevant is a bitch move of desperation.
Yet you discredit the formula for photosynthesis that doesn't require temp? But I'm supposed to accept this chart?

Being picky on which info you want to be relevant is a bitch move of desperation.
How about you actually admit you have NO schooling in plant physiology!
How about you STUDY on the VPD!
How about you actually search on the VPD and learn something!
How about you simply admit YOUR wrong on your idiotic temps and RH values!

The chart you called a "bitch move of desperation" is HORT 101 !!!
There are literally dozens of them available by simply searching VPD chart in images!

The only "bitch move of desperation" was yours!
 

Dr. Who

Well-Known Member
Optimum is what you, you're own personal preference, recognize to be right. I grow plants at low temps fine. You grow them at high temps fine. As long as both plants grow unaffected by temp, then the plants are growing at an optimum rate.

This is about the plants, remember? You're personal temp preference has no sway on what the plants can thrive in.
WRONG AGAIN!

Like I said earlier. EVERY book written on growing our C# plant lists 70 -78 as "optimal". Most even say 70 is the target temp.
 
Last edited:

Dr. Who

Well-Known Member
You can't say it's no better or worse unless you test it, side by side preferably. The plants will adapt to some extent, but cooler temps are going to slow down the chemistry in the plant.

If all other variables are left the same and you only increase temp closer to optimal, yields will also increase closer to optimal.

There is plenty of evidence to close the book on cool temps being able to match the results of more optimal temps. The interesting place to look at cooler temps would be the resulting taste differences. At too high of temps taste gets horrible. Often fruits/vegetables get sweeter and tastier if left to go until temps get lower, I might believe that taste could be better on some plants in cooler temps, but you can't fight the laws of physics on growth rates in different temps.
This effect is due to the transition of complex carbs to simple sugars from colder temps!

In case anyone is interested.
 

GhostBud420

Well-Known Member
I dont mind ignorant growers.. Its when they start putting bad info out there that really gets me. If your not 100% sure about what your saying then dont. You only make yourself look bad and possibly effect another persons grow that they have been working really hard on.
 
Top