Heat = 93F but plants are fine?

[RyanTheRhino]

ok so every one always says that you have to keep the heat below 90 but my plants are 20 days old and i just got a temp/humidity sensor and it reads 93f and humidity of 48..

my question is since they have grown up in this heat for 20 days and they are healty should i even worry about cooling the room


Ps. the room is 78.9F but under the lights is 93F

 

[Gardener 09]

i have had my room up to 90, but when this happends i put my fan right on the plant so the leavs are moving around and there is a breez and i got through it just fine, for you, the plant is adapted to that temp so you prob. have less chance of shock.

 

[hwy420]

i have had my room up to 90, but when this happends i put my fan right on the plant so the leavs are moving around and there is a breez and i got through it just fine, for you, the plant is adapted to that temp so you prob. have less chance of shock.

HaHa, yeah most people think that MJ would die at those temps. Believe it or not like Gardener said, the plant has adapted to being able to endure upwards of 110 - 120 degrees without problem. As long as they have enough water to cool them, they should be fine. Hotter temps allow more growth which in turn means you can increase the PPM Nutrients. As long as the plant has enough water; it'll be fine. I left my closet door closed and forgot to turn on the AC, and it got 117 degrees in my closet with the 400W running for 18 hours. Plant looked like it kinda liked it. It may have stunted it though, I don't know (my first grow)

 

[Green Cross]

You should worry more about males and hermaphodites

Here's how you improve your odds of producing more females

1) more nitrogen, less potassium;

2) more halide (blue spectrum) and less high pressure sodium (red spectrum) lighting;

3) shorter light cycles;

4) a grow medium of 6.6 to 6.8 pH; 5) lower temperatures and higher humidity, plus higher soil moisture;

6) minimized stress (cloning and other stressors can destabilize plants, causing them to go male or hermaphrodite).

is it any wonder we see so many hermies?

 

[RyanTheRhino]

i have 7 plants 1 that is 21 day old and 6 that are 16.. and i already have a fan on them i just hope when they get bigger and i move my rig up it will have better air flow

and for short lit cycles it on 12/12 from seed i do it to find the esx before i vegg i dont know how much time i save or waste but i would rather find out first

 

[ROBINBANKS]

TEMPERATURE - Cannabis Growing Guide

Proper temperature is one highly variable factor. Most books state optimum grow temperature to be 70-80 degrees, but many list extenuating circumstances that allow temperatures to go higher. Assuming genetics is not a factor, plants seem to be able to absorb more light at higher temps, perhaps up to 90 degrees. High light and CO2 levels could make this go as high as 95 degrees for increased growth speed.* An optimum of 95 degrees is new data that assumes very-high light, CO2 enrichment of 1500 ppm and good regular venting to keep humidity down. It is not clear if these temperature will reduce potency in flowers. It may be a good idea to reduce temperatures once flowering has started, to preserve potency, even if it does reduce growth speed. But higher temperatures will make plants grow vegetatively much faster, by exciting the plants metabolism, assuming the required levels of CO2 and light are available, and humidity is not allowed to get too high.
With normal levels of CO2, in a well vented space, 90 degrees would seem to be the absolute max, while 85 may be closer to optimum, even with a great deal of light available. Do not let the room temperature get over 35 C (95 F) as this hurts growth. Optimal temperature is 27-30 C (80-86 F) if you have strong light with no CO2 enrichment. Less than 21 C (70 F) is too cold for good growth.
Low temperatures at night are OK down to about 60 degrees outdoors, then start to effect the growth in a big way. Mid 50s will cause mild shock and 40s will kill your plants with repeated exposure. Keep your plants warm, especially the roots. Elevate pots if you think the ground is sucking the heat out of the roots. This is an issue if you have a slab or other type of cold floor.
As temperature goes up, so does the ability of the air to hold water, thus reducing humidity, so a higher average temperature should reduce risk of fungus.
Contrary to many reports, high humidity is not good for plants except during germination and rooting. Lower humidity levels help the plant transpire CO2 and reduce risk of molds during flowering.
Studies indicate the potency of buds goes down as the temperature goes up, so it is important to see that the plants do not get too hot during flowering cycles.
* D. Gold: CO2, Temperature and Hum

 

[ROBINBANKS]

http://www.sweetleaf.co.uk/grow_airtemphum.php

 

[Gardener 09]

TEMPERATURE - Cannabis Growing Guide

Proper temperature is one highly variable factor. Most books state optimum grow temperature to be 70-80 degrees, but many list extenuating circumstances that allow temperatures to go higher. Assuming genetics is not a factor, plants seem to be able to absorb more light at higher temps, perhaps up to 90 degrees. High light and CO2 levels could make this go as high as 95 degrees for increased growth speed.* An optimum of 95 degrees is new data that assumes very-high light, CO2 enrichment of 1500 ppm and good regular venting to keep humidity down. It is not clear if these temperature will reduce potency in flowers. It may be a good idea to reduce temperatures once flowering has started, to preserve potency, even if it does reduce growth speed. But higher temperatures will make plants grow vegetatively much faster, by exciting the plants metabolism, assuming the required levels of CO2 and light are available, and humidity is not allowed to get too high.
With normal levels of CO2, in a well vented space, 90 degrees would seem to be the absolute max, while 85 may be closer to optimum, even with a great deal of light available. Do not let the room temperature get over 35 C (95 F) as this hurts growth. Optimal temperature is 27-30 C (80-86 F) if you have strong light with no CO2 enrichment. Less than 21 C (70 F) is too cold for good growth.
Low temperatures at night are OK down to about 60 degrees outdoors, then start to effect the growth in a big way. Mid 50s will cause mild shock and 40s will kill your plants with repeated exposure. Keep your plants warm, especially the roots. Elevate pots if you think the ground is sucking the heat out of the roots. This is an issue if you have a slab or other type of cold floor.
As temperature goes up, so does the ability of the air to hold water, thus reducing humidity, so a higher average temperature should reduce risk of fungus.
Contrary to many reports, high humidity is not good for plants except during germination and rooting. Lower humidity levels help the plant transpire CO2 and reduce risk of molds during flowering.
Studies indicate the potency of buds goes down as the temperature goes up, so it is important to see that the plants do not get too hot during flowering cycles.
* D. Gold: CO2, Temperature and Hum

Nice post, i even lerned something.

 

[RyanTheRhino]

http://www.sweetleaf.co.uk/grow_airtemphum.php

well i hope and am pretty sure that when i raise my rig it will allow better air flow

my room temp is around 78f and is my scale read the higest it ever got was 93 under the lights

and if what that artical says is correct it will be perfect increased vegg and by the time the i start flowering the rig will be raised

 

[FilthyFletch]

The issue is they may seem fine but it causes stress on young pnats and in the end you see effects in the yield and quality of the yield

 

[RyanTheRhino]

i dont know man just today i looked at them came back in 3 hours and there was noticiable growth not like another node or anything but you could tell all the leafs got bigger on all the plants

 

[kho20]

its not that they wont grow its back to the yield/potency factor is the reason most grows are kept at cooler temps, my room used to be bout 93 lights on i added a couple fans for better airflow ( robbed me some out of an old refrigerator lol) and now i sit a t 81...... airflows key if you have higher temps youll need more airflow to compensate i actually vegged plants this year outside and heat got up to 106 for two weeks straight and it jus slowed growth now their perfect size for flowering indoors

 

[FilthyFletch]

If you had consistant co2 at 1500 ppm in the grow room then the temp would be ok as it would allow faster transpiration via the leaves but at 93 its more stress without the co2

 

[RyanTheRhino]

i have yeast and sugger in 4 cups scatered thru out my grow aera

 

[tcoupemn12]

i read you have to apx 1/3 of the floor space to make 1500 ppm of co2. that only lasts for a couple of days the starts dropping.
source is a free mag i got at the hydro shop called maximum yield july 09 issue the article is called which co2 are you?

 

[RyanTheRhino]

i figgured i wouldnt last long but i just add like 1/2 cup of suggar a week till the yeast die better than nothing?? right

 

[tcoupemn12]

yep. if your in a closit or small room it will at least help replace wat the plants use when the door is closed. im in a 35inchx18inx 5ft chiferobe i got 3 half gallons jugs and 2 16oz bottels all half full im adding another 1/2gal tonight.

 

[FilthyFletch]

Ryan those cups wont help really at all. If the room was lets say 8x8x8 then you would need about 4-6 of the 5 gallon co2 boost buckets to keep the co2 around 1500 and unless you can keep it aroun the 1500 ppm when lights are on your not gonna benefit from co2

 

[SKandall]

my experience the heat made the girls stretch out & her fruit became leafy stretched not dense, id control it if anything thought c02 and keep it at 77 degrees

 

[tcoupemn12]

^id control it if anything thought c02? wat?