lower temps during late flower.

[Mr Burns]

Has anyone experience of low temps during flower. I've managed to adjust the stats on both the exhaust and propane heater maintaining 24C/75F +/- 1C, but they seemed happier ormore productive with higher temps?

It might be that part of the brain that anticipates a change, so anything but a substantial development registers as zero growth.:crazysign

[Cranky]

little about low temps;)

Low temperatures
Plant metabolism will decrease at low temperatures. Chemical reactions within the plant will take longer. Optimum plant growth often requires close temperature regulation; daytime temperatures between 25C and 30C are preferred. Differences in daytime and nighttime temps should not be dramatic, as this difference may shock the plant.

abit more.....

Temperature
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 50's will cause mild shock and 40's 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.

cranky

[Dibbz]

My room is at a 25-30 during the hours when the lights are on....

And when they off due to the Delongi Heater with Thermo i have it at about 19-23....

Cranky is spot on with the information there!2thumbs

Make sure these things are controlled as much as possible!!!

[Fillabong]

I enjoy a really hot flower. Last time I had things in bloom my room was in the high 90's with no humidity. I never have dense buds but they sure are frosty:D

Keep it real. August is one of the hottest months in the northern hemisphere and when plants begin to grow into full flower. Keep it hottt;)

[Mr Burns]

Cranky
Your a sport. Thanks for the info as it's made it all clear. It'll teach me to adjust the room to suit a snippet of info I came across!
It's cost me around 4 days growth which is a total bitch cause I wanted these girls harvested pre xmas and the next all Chronic LSTd grow in. That way I could rest easy over the xmas period and not have to take up the kitchen table with vistors coming and going!
You heard it, I went against serious seeds advice and topped all 10 of them. This'll be my first indoor LST :eek:


Dibbz.
I once knew a train driver called Dibbz. Anyway, the room is in total control being able to adjust the two thermostats creating a stable and constant temperature. I'm able to keep root level at 24C/75F but this lowering temp lark I was playing with lowered it to 16C/61F. I'm now back up to a respectable and controlable 31C/88F at canopy level and 25C/77F at root level.

Filla.
I guessed something was wrong with these lower temps cause I just didn't see any change, like when you notice a particular plant starting to yellow more. The biggest stall I noticed was the red hairs, they just seemed to go from a noticeable 5-9% increase a day to nothing. In fact it was that which gave me rise to concern and hence this thread.
You mentioned August being the hottest month, but I was thinking of September/October temps as these are in the last 2 weeks of flower. Then again, taking into account these are indoor strains perhaps avoiding and adapting the grow to outdoor climates should be forgotten?

Thanks for all your info and it's good to know we can cut to the chase without any sceptisism or balony 2thumbs