What sort of temperature and humidity is optimal for mid and late flowering ?

J

Joker90

Well-Known Member
Going by Vpd 40% humidity and 17-18°c

Is this correct . I need to chill the tent mid to late flower ?
 
28c 50rh mid flower then taper down to 27/26and down to 30rh if possible in late flower.You want a slightly lower temp and much lower humidity towards the end. Reason being is you wanna try and increase resin production with low humidity but also maintain the higher vpd in order for the plant to cannibalise itself.
 
bk78 said:
Lower the lights? Why
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Some would and some wouldn't. For example someone throwing 500umols at their plants likely wouldn't want to lower the lighting. Organic vs hydro plays into the mix also as organic tends to fade at the end and benefits from not pushing max light. Many hydro growers roll to the finish at the same level.

The other part is (imo) if someone chooses to try and maximize terpenes and minimize foxtailing, reducing the light to a more mid level helps....again assuming one uses a lot to begin with.

Since most of us link light intensity, temperature and humidity and try to keep it in a reasonable VPD range...they all are reduced together in the last few weeks.

The consensus I have read/observed is that the plants growth is almost finished, and the really strong lighting and higher temps that fuel growth can be traded a bit for more intense terpenes and a less stressed finish (foxtailing, burnt tops etc).

I just tried it on my 2nd run after reading what a few of the better growers do, and quickly saw a much more professional result. I am sure my own limitations play a part. As an organic water only grower it is challenging to keep vigorously healthy plants to the end.
 
For me LED(s) 320(s), I run mine 82F to 84F 65%RH veg, 60%RH during flower, and the lights are always 12 inches from tops from start to the beginning of week 5 of flower, then I lower my lights to 4-6 inches from the tops. And I run each 320 @ 60% 225 watts, 2 plants in 5g pots under each light!
 
A lot of it is probably strain dependant. Swazi or Kush are high altitude plants and get near freezing close to finish. I haven't done any indoor/outdoor experiments, but my Swazi outdoor go until a couple night time freezings and they shine like diamonds. Blue Dream outdoor this year we're struggling the minute it dipped below 10c.
 
ComfortCreator said:
Some would and some wouldn't. For example someone throwing 500umols at their plants likely wouldn't want to lower the lighting. Organic vs hydro plays into the mix also as organic tends to fade at the end and benefits from not pushing max light. Many hydro growers roll to the finish at the same level.

The other part is (imo) if someone chooses to try and maximize terpenes and minimize foxtailing, reducing the light to a more mid level helps....again assuming one uses a lot to begin with.

Since most of us link light intensity, temperature and humidity and try to keep it in a reasonable VPD range...they all are reduced together in the last few weeks.

The consensus I have read/observed is that the plants growth is almost finished, and the really strong lighting and higher temps that fuel growth can be traded a bit for more intense terpenes and a less stressed finish (foxtailing, burnt tops etc).

I just tried it on my 2nd run after reading what a few of the better growers do, and quickly saw a much more professional result. I am sure my own limitations play a part. As an organic water only grower it is challenging to keep vigorously healthy plants to the end.
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Important clarification

Lower the lights in this case I meant "intensity", not to physically lower the lights. I could see how that would cause confusion. Sorry for being unclear.
 
ComfortCreator said:
Some would and some wouldn't. For example someone throwing 500umols at their plants likely wouldn't want to lower the lighting. Organic vs hydro plays into the mix also as organic tends to fade at the end and benefits from not pushing max light. Many hydro growers roll to the finish at the same level.

The other part is (imo) if someone chooses to try and maximize terpenes and minimize foxtailing, reducing the light to a more mid level helps....again assuming one uses a lot to begin with.

Since most of us link light intensity, temperature and humidity and try to keep it in a reasonable VPD range...they all are reduced together in the last few weeks.

The consensus I have read/observed is that the plants growth is almost finished, and the really strong lighting and higher temps that fuel growth can be traded a bit for more intense terpenes and a less stressed finish (foxtailing, burnt tops etc).

I just tried it on my 2nd run after reading what a few of the better growers do, and quickly saw a much more professional result. I am sure my own limitations play a part. As an organic water only grower it is challenging to keep vigorously healthy plants to the end.
Click to expand...
Thanks for that. I'm an organic grower and find I always limp across the finish line. Now I know what to try to fix that.
 
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