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VPD: The Final Stages Of Life

OGeMann

Well-Known Member
Lets talk about VPD in flower, Am I supposed to follow VPD when in flower. (the final 2 weeks) humidity 30-40% temps 70-75F will give me a VPD of 1.5-1.65 {leaf temps -2,-3 cooler} that would be on the high end. do I keep the temp/RH or try to follow VPD. {just in flower}


what about if running CO2, and I am not, the last 2 wks before harvesting the RH should be between 40-30% 30% for the last week the VPD is at the high end of 1.6 When in that stage its at the right set of VPD just on the high or above set #…currently I am at 74 F- 37%RH and that gives me a VPD 1.5 in witch I am at a 1.57

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OGeMann

Well-Known Member
I follow VPD up until week 2 of flower.
After that I start lowering both temp and humidity.
I lower humidity about 5% per week until the final week or so I am 30-35% humidity.
I drop temp from 77-81⁰ down to 70-73⁰
This seems to help trichome and terpene production.
this is exactly what I am doing, so you can follow vpd until the last 2 weeks of flower.
this is the screen shot of the Pulse One of my environment
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