Vpd night vs daytime

Should I keep vdp the same at night time as it is in daytime

Search the community site for Pete’s response.

My interpretation, assuming that “night time” means that you’re shutting off the lights, there’s no need to follow VPD guidelines but don’t go overboard.

Pete said it better. :slight_smile:

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Here is the thread @OC_Grower is referencing: VPD night settings

This is a somewhat controversial topic amongst growers, but as Pete explains it, both sides are right. VPD does matter at night, just not enough to be optimized for.

This is a somewhat controversial topic amongst growers, but as Pete explains it, both sides are right. VPD does matter at night, just not enough to be optimized for.

It’s my understanding that while the above is true, it’s also my understanding that powdery mildew is a vicious beast and avoiding too much humidity in flower is still ideal.

As long as you have good air flow at top and bottom of canopy, PM shouldn’t be an issue. 85% of my grow I was at 50-55% RH with no issues whatsoever.

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