how hot is too hot?

[FlyinHawaiian]

im a noob at growing indoors, I just setup my first small 250w cmh flower cab, I got the lights on at night to drop a few degrees but it still runs about 88-90 in the cab and about 83-85 ambient, this is with an aircooled hood too. I guess ill need an air conditioner in the bedroom. but how hot is too hot before plants suffer? and whats the ideal temp?

 

[ibjamming]

They'll live up into the hundreds...but they won't be the best. I've done it...not pretty, but sometimes you do what you have to do. I do have excellent ventilation though.

You're a little hot, I believe the low 80's is ideal.

 

[YoungBud]

I never like to go over 80 for any reason.. Unless strain likes it..

 

[!!!]

I'm between 90-100F. I can't get it any lower. Just make sure the roots don't get anywhere near this warm and your plants will be OK.

 

[YoungBud]

OUCH 90-100... in my experience with temps that high = Airy buds low THC and Stretching..
You Have to get thos temps down man..

 

[rick shaw]

Keep the exhaust on 24/7.Critters love warmer rooms,get ready for invasions.

 

[clp]

Below 80 is ideal below 90 plants will survive above 90 and you're going to get some stretchy airy bud!

 

[blancorasta]

hey flyinhawaiian,

if your in veg dont worry about it the only problem can come from drying out.

if your in bloom they will live from the 90's to the 100's, but your yield and quality! will begin to deminish if once in the 80's without C02 supp. if your not using c02 keep them in the mid to high 70's, unless it a very sativa dominant strain then in that case you can probably safely get into the low-mid 80's

if you can lower the ambient temp in your house, id start there as it will always be warmer in your grow room. then go with a dual duct (one for intake air and another for exhaust air) portable air conditioner or a window unit if your grow shares an external wall. C02 helps plants deal with higher temps

try and think about it like this. the temp regulates a plants metabolism. so as the temp increase the plant responds with a metabolic increase, it drinks more water, uses more nutrients, and needs to breathe more air. just like we do when we exert ourselves through exercise, except we breathe oxygen not C02. so imagine you were sprinting a kilometer with your nose plugged and a snorkle in your mouth (and yes some elite atheletes do this to train themselves to push through that wall they hit). you would get fatigued instantly,stop, and possibly colapse. the same thing happens to cannabis if you increase the temps without supplementing with c02, plus if you add C02 you'll complete the chain; the plant will use more water, nutrients, C02, and light for an increase in photosynthesis which will dramatically increase your yield and quality!

I'm between 90-100F. I can't get it any lower. Just make sure the roots don't get anywhere near this warm and your plants will be OK.

exaclty, if there is no way for you to lower your temps into a suitable range.
IMO your best option, and ive done it, is to keep your nute water in the fridge overnight before you water. by keeping the roots cool you can offset the heat experienced by the foliage, and it works vice versa.

its kinda like how on a warm sunny day your skin gets real hot but just drinking some cool water can make you feel alot better, cause the cold water is lowering your core temp and helps regulate/offset your external skin temp.

my two cents,
good luck,

peace

 

[the END]

Thanks for all that guys...

Im with ya !!!, My temps range from 90-98 when the lights come on; but the roots/reservoir beneath in the shade of the canopy is also right where my Swamp cooler pushes air in, and easily stays beneath 85. Mid plant, right at the surface of the SCROG screen is about 91, 2nd week of flowering. Each day I fill up big pitchers of water and bring them to almost freezing temp before filling up the swamp cooler.
*I'm also in a Desert Climate, which is why the Swampy works considerably well....

Going to see if I can get my hands on some Dry Ice, and start supplementing with co2. Most stores around here stopped carrying it unfortunately..

 

[blancorasta]

hey the END,

it is difficult for alot of people all over the place to grow indoors during the summer, and i have learned through having some horrible summer crops.

if i may try and give you some help,

first, its great that your gonna give your babies co2, but you have to make sure you dont vent while releasing co2. youll just be blowing the co2 out of the grow room. some people cycle their co2 with their ventilation. when the temps get to high the co2 shuts off and the vents turn on, when it cools down below desirable the vents shut off and the co2 turns back on. i personally run a sealed room.

but dont use dry ice or those compost co2 generator thingys, ive used them both and their not worth it. save up ur cash and get a good co2 monitor/controller, a regulator, and tank. you could even find a used regulator on Cr-igslist.com .

secondly, if your canopy temp is in the low 90's your water temp should be around 65 or a little lower to offset the canopy temp. even 85 is high for water temps independant of canopy, remember water temp determines oxygen solubility. so the warmer the water the less oxygen it can hold, the cooler the water the more oxygen it can hold. and roots need as much oxygen as possible and the more root the more fruit! fruit=bud lol.

i hope some of that could be of some help,

if worst comes to worst and you cant keep the temps lower take the summer off, ( ive done it and personally it helps for moral, as it was better for me to do that than spend a few months loving and caring for some plants that turn out to be junk which is disheartening and can be discouraging to some) start groing again in a couple months and save up your money so by next spring you have all the cooling, a/c, and co2 equipment you need to control your environment perfectly and you'll get the best weed youve ever had without dealing with many of these "headaches"

again i hope it helps,
peace

 

[Grass Lands]

depending on how big your cab is...you can freeze a few gallon milk jugs with water to place in the cab...I wont drop the temp a lot but every little bit helps....replace the jug when it is completely thawed with another frozen jug.

 

[tokinafaty420]

I like to keep temps at 80F for veg, 75F for flower. 5-10 degree drop during lights off for both phases.

 

[blancorasta]

 

[the END]

Well after just checking back in this thread, I made my first move of tossing a cup full of ice cubes in the DWC bucket.

I am going to run out and get an aquarium thermo to monitor the reservoir temperature.
The ambient temp beneath canopy around the res is 79-83F

Peaking at my roots, I agree they could be doing better...
much earlier in veg, I had experimented with using Earth juice in the res, and obviously had an organic brown mess which funked up my roots. I was able to recover through flushing and h2o2.
Now, apparently there's a small amount of dead organic matter which bugs have found to live on, higher in the root mass where it is not always submerged.

My counter thus far, has been keeping the water level high, and acidic with a strong amount of nutrients, which the plant does love anyway.... I may consider adding some ph down.(probably NOT)
I added a minute amount of Bayer Lime & Citrus since I had it on hand, and it had worked in the past for soil. I just mixed it with some water, and drenched the upper part of the roots in the net pot.

Truly, I am not counting on these gnats to be much more of a problem that I won't manage, but if anybody has suggestions, or experience, SHOOT.


Blancorasta,
From what you're saying it seems like any "hot op" is going to go to hell in that kind of heat. Despite my inexperience, I am dedicated to see this grow to the finish. and Certainly, I have already mentioned a couple of those summer grow follies you speak of.

Back on Topic real quick, What is the usual resultant of flowering plants in 100F HPS/Hydro grow without proper Co2 supplement?
-Stretchy, whispy, dry, impotent buds I can Imagine.

But I also like to believe that a lot of plants out there would love that kind of heat, and even the ones that didn't should have a swell chance at adapting and producing if not an amazing output a pretty darn good one?

Personally, I've been spending this summer working with a lot of different plants acclimatizing them to this heat, and I'm no pro... (f'sho).But, in varying genetics, I have noticed a strong adaptability and behavior change through all the different variables We have been subjected to. Maybe I'm crazy, but I like the idea of strengthening plants against their environment, and encouraging them to push through.
Truthfully, It's just noob talk, but We are determined to have a successful summer op! So thanks for you advice, it is much appreciated.

About the Co2, In the future I may consider setting it up the right way with the regulator and all that as you speak of. For now, I was just merely interested in a small hobby project type experiment, of taking a block of dry ice, placing it above my lamp and watching it flow down and mist up the canopy. HAha I am sure that is not the most efficent way to do it, but I intend to atleast 'mess around' and possibly find something of small Use to my satisfaction.

the END

 

[TruthOrLie]

Where to put the thermometer?

At the canopy?

At the base of the plant?

At the bottom of the medium?

I take my temperature readings from the bottom of the pot.

I start freaking out when it begins to climb above 81 degrees.

 

[the END]

Take readings form every spot in your grow under each different setting you are able to run on. That way you can have an understanding of the air flow, the hot spots etc.

 

[blancorasta]

the END,
i hope im not coming off as pompous, or a know it all. im just tryin to lend a helping hand

Peaking at my roots, I agree they could be doing better...
much earlier in veg, I had experimented with using Earth juice in the res, and obviously had an organic brown mess which funked up my roots. I was able to recover through flushing and h2o2.
Now, apparently there's a small amount of dead organic matter which bugs have found to live on, higher in the root mass where it is not always submerged.

i use hygrozyme, an enzyme product that breaks down dead organic matter, ie. dead roots, into nutrients for the plant and stimulates root growth. its not really a nutrient but works wonders for keeping root healthy which in turn keep your plants healthy. ive used fox farm's line of hydro nutes before at half strength using filtered water and had excellent results. and no organic matter to get all gunkie an growthie and attrack pests. but i use soil now

Back on Topic real quick, What is the usual resultant of flowering plants in 100F HPS/Hydro grow without proper Co2 supplement?
-Stretchy, whispy, dry, impotent buds I can Imagine

yep, pretty much, loose, resinless, smelless, poor tasting non sticky buds. unless maybe, you have some crazy landrace sativa

But I also like to believe that a lot of plants out there would love that kind of heat, and even the ones that didn't should have a swell chance at adapting and producing if not an amazing output a pretty darn good one?

definitly, lowland sativa's and their resulting hybrids can tolerate and sometimes thrive in relatively high heat, though they usually coinside with moderate levels of humidity

About the Co2, In the future I may consider setting it up the right way with the regulator and all that as you speak of. For now, I was just merely interested in a small hobby project type experiment, of taking a block of dry ice, placing it above my lamp and watching it flow down and mist up the canopy. HAha I am sure that is not the most efficent way to do it, but I intend to atleast 'mess around' and possibly find something of small Use to my satisfaction.

the END

4 sure, it wont hurt and will help some. and def. look cool.

have fun and good luck,

peace

 

[THC123]

yep, pretty much, loose, resinless, smelless, poor tasting non sticky buds. unless maybe, you have some crazy landrace sativa

my buds where great , but like you say here above , they where almost smelless and non sticky(the top buds) , the lower buds whre sticky and smelly as hell

I'm really gonna wtach this for this grow

 

[blancorasta]

my buds where great , but like you say here above , they where almost smelless and non sticky(the top buds) , the lower buds whre sticky and smelly as hell

I'm really gonna wtach this for this grow

thats what im talkin about,
last summer i had a big ass 11gallon container Chemdog Double d plant, the one plant to actually amounted to anything, well the top cola was iffy at best because of the lack of resin but imediately bellow it were buds that werent so close to the light and got a little shade and they were sooooo bomb. sometimes if i think about it hard enough i can still smell and taste those nugs... mmmmmm....

peace

 

[the END]

Thanks for the outcome descriptions! just like what I would expect. Helps to Outline the importance of air flow, humidity, and heat.

Blanco,
When you mentioned FF nutes (as that IS what I am working with) were you talking about NOT having any pest troubles grown this method, or possibly having ELIMINATED some to a small degree?
If either is the case, I am confident I may be able to knock them out doing just what I am with lower water temps, full res, and good amount of nutrients. Otherwise i may look into hygrozyme in the next couple days here.

I should note the strain I am growing here is dubbed "sour Cream" which is a cross of the OG sour diesel x g13 haze. Def leans to the Sativa side of things, which was another reason I think I should be in a nearly prime position.

Oh yea, and i totally know what you mean about thinking hard enough and smelling a nug from the past! maybe not that exact scenario, but so many other connections between senses, memories, emotion, and thought in this Life of ours!