The Grow Awards 2026 🏆

Best Temps for last 2 weeks of Flower (Indoor Grow)

Growmebig
Growmebigstarted grow question 21d ago
I have settings at 75-80 during day (average 78 Degrees) and 64-72 at night (during 4 hrs of Darkness). averaging 66 degrees. Im on day 68 (from seed) and have a lot of Tricombs but all crystal clear. I want to finish my first grow Strong.
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Week 9
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Ultraviolet
Ultravioletanswered grow question 20d ago
Depends on the goal, sometime if I want to try and encourage genes which express themselves at a higher level when the temps are cold, anthocyanin the pigment is largely from exposure to cold. When we talk about trichomes you have to understand what is good for rapid growth and optimal for photosynthesis is not optimal for preservation of the trichomes. My personal entire premise is to go as hard as possible in the first 4-5 weeks of flower, and as soon as trichome production ramps up my entire priorities change to trichome preservation. Ideally you want to keep a 10 degree swing between day and night to prevent undue stress, but if I'm going for anthocyanin I can drop it by 30F overnight. The lower you drop your temps though the less cellular respiration will drastically drop and the entire process is temperature driven. Reduce the oxidative workload on the plant's, reduce dli, reduce temps, open up the oxidative workload so she can produce the antoxidants she needs like thc. Light and heat accelerate the decay of thc to cbn. Your job is to slow thay motherfucking process down as much as possible while still give her enough juice to grow and actually fill the trichomes rather than just bake them to fuxk until you get 10% amber 30% milky and 60% clear glass. "My trichomes are ready", sure they are buddy.
Ultraviolet
Ultravioletanswered grow question 20d ago
No real right or wrong, there is only priorities. Good common sense thing is to try to understand the different processes at work, What is a antoxidant? How does the plant produce anoxidants? Does plant require oxygen to produce antoxidants? How does a plant utilize its oxidative capacity during daytime, how does it change at night? What can be done to facilitate the production of antoxidants at the critical time of ripening? What nutrients are mostly used in the creation of antoxidants? Is it beneficial to flush for weeks prior to harvest and during ripening when the plant needs micronutrients in order to process antoxidants and fill trichomes. Rapid growth right to the end will burn off your profile and leave you with no smell or taste. Cooling things off too much will stunt growth and has potential to skew a medium.
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Ultraviolet
Ultravioletanswered grow question 20d ago
Terpenes such as myrecene start to degrade above 67F.
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Organoman
Organomananswered grow question 21d ago
Just keep them healthy.........don't over complicate things........
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Fruitgrower
Fruitgroweranswered grow question 21d ago
As low as you can get really, I always struggled with this, the only true thing that helped was a portable air con unit but it wasn't necessarily cheap to buy or to run. Try and time your grows so the end of flowering is not in the middle of summer, that'll help
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Nocone_Purple
Nocone_Purpleanswered grow question 21d ago
You’re right on track, For the last 2 weeks of flower, aim for around (20–22°C) during lights on and (15–18°C) at night. That small drop helps bring out colors and preserve terpenes. Keep RH around 45–50%, and those trichomes will start turning cloudy/amber soon. You’re almost there strong finish coming!
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Ninjabuds
Ninjabudsanswered grow question 21d ago
Hey there. I personally try to not let the temp fluctuate more than 10degrees in a 24 hour period. What you described seems fine especially if the plant has become used to that. I would say to make sure to dial back bloom nutrients the last few weeks of flower but make sure to keep giving micros and magnesium…. Also after the bulk building weeks of flower you can def dial the lights back some. I think you should put the light schedule to 18/6 or 17/7 or even 16/8… also make sure not to harvest early from being impatient. It’s the worst when you buds don’t get you high. You will notice the buds swell up and hairs turn inwards and change colors the plant will look visually more white whe the tricombs all get cloudy
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m0use
m0useanswered grow question 21d ago
just keep the temps stable. and your good. Plants will adapt if the room is a bit colder or hotter then their preference. I would recommend doing a longer night period of 6-8hrs. 18/6 is good or even 16/8 all depends on your light and if you can hit the DLI of aournd 35-40 in that time.
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John_Kramer
John_Krameranswered grow question 21d ago
it'a about DLI not the temp
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