Does VPD matter at night?

[PulsePeet]

Hey everyone,

I've been working on an update to my VPD guide for a while to answer a question I often get:
"Does VPD matter at night?"

To sum it up:
Although VPD at night isn't nearly as important as your day VPD,
it's still an important factor to consider for vigorous plant growth and increased yields

If you're pressed for time or just don't like reading a lot, here's a handy infographic with a bunch of tips:

Learn about ideal nighttime VPD, how much optimal VPD can increase yields, and more on the blog I wrote

Also if you have any questions or feedback on the blog, lmk. I'm sure there are typos in there lol

 

[freezeland2]

I believe that target daytime vpd range of .8 - 1.2 to be late vegetative / early flowering stage. I run 1.2 to 1.6 during mid to late flower. For seedlings through early veg I run . .4 - .8

I do maintain those recommended nighttime vpd during the dark period.

 

[PulsePeet]

T

I believe that target daytime vpd range of .8 - 1.2 to be late vegetative / early flowering stage. I run 1.2 to 1.6 during mid to late flower. For seedlings through early veg I run . .4 - .8

I do maintain those recommended nighttime vpd during the dark period.

Those are pretty good values to run, 1.2 is more ideal in flower, but you always have the worries of mold as you get later into it so it makes sense to drop your RH which raises VPD

 

[GeneralRedEye]

that’s very interesting. Everything I’ve seen chart wise increases the VPD. Do you think running lower temp but in the ideal VPD 1.2 is better than running warmer but higher VPD using Co2 enrichment with both?