harvest

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pimpcam

Active Member
First time growing outside and the temp where I am is dropping into the the mid 40's and day time highs are ranging from 65-75 degrees. The trics on the buds are milky and not brown yet. The plant has been in bloom for 8wks
 
HarmlessPlants

HarmlessPlants

Well-Known Member
Mid 40´s, I don´t want to frighten you but in my opinion your plant could die. When they are all milky for a while I wouldn´t take the risk waiting for the trichome to go amber. Let´s wait and see if you get more response of people growing at those temps, where I live the temp never drops below 60.
 
HarmlessPlants

HarmlessPlants

Well-Known Member
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 Humidity, 1991 Edited by E. Rosenthal.

 
codster25

codster25

Well-Known Member
I'll tell you in plain English about your risks, I've had 2 windshield scrapping frosts all ready this year and I'm growing a variety of strains from Indica, Sativa and hybrids. My plants have been fine, also I've had 2 weeks of rain and no probs. Most people will tell you a couple minor frosts above -2 or -3 will be fine. A good tip is to keep your soil moist, the night before a frost or cold front. Sounds stupid watering on a cold night but the experts will tell you it's the next best thing if you can't cover them up. I live in Northern Ontario and this year in Canada and most of the U.S. we will be having above average weather starting this week through October and possibly November. Do not I repeat Do not pull yet, your buds are really going to swell soon 8 weeks is still early if you want mega weight and potency. I promise you if you leave them another 2-3 weeks you will be fine, I'll bet my temps are colder than yours up North here and I'll be leaving mine in until at least the 6th of October probably even later if it doesn't fall below 0 degrees Celcius. Anyhow good luck and research what I told you if your still unsure, I wouldn't lie to you about this kind of shit it's important to reap the best of what you have sowed. :)
 
catmando

catmando

Well-Known Member
HarmlessPlants said:
Mid 40´s, I don´t want to frighten you but in my opinion your plant could die. When they are all milky for a while I wouldn´t take the risk waiting for the trichome to go amber. Let´s wait and see if you get more response of people growing at those temps, where I live the temp never drops below 60.
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why give such terrible and incorrect advice to a new grower? plants can survive down to 32 degrees, thats the freeezing point remember. Some plants can survive a few frosts even. youve got nothing to worry about until the temp drops below freezing.
 
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imchucky666

Well-Known Member
HarmlessPlants said:
Mid 40´s, I don´t want to frighten you but in my opinion your plant could die. When they are all milky for a while I wouldn´t take the risk waiting for the trichome to go amber. Let´s wait and see if you get more response of people growing at those temps, where I live the temp never drops below 60.
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I've had 5 nights into the low 50's last week, and the past 2 nights actually got into the high 40's by 2 or 3 A.M., and my plants seem to actually like it. 1 Indica, 1 Sativa, in pots, daytime temps low 80's to mid 90's, kinda high humidity.
 
HarmlessPlants

HarmlessPlants

Well-Known Member
@catmando: If you would have had a better read you would have noticed that I gave the advice to wait and see what growers that grow at those temperatures have experienced. When you say it is brilliant to expose the plant at mid 40´s is fine with me, I don´t have the trouble of low temps, better safe than sorry.
 
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