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Activity Forums Grow Tips VPD during flowering cycle.

  • VPD during flowering cycle.

    Posted by bluehorseshoe on December 4, 2020 at 7:48 pm

    What’s up Gromies,

    Trying to dial in my temps using this VPD chart and I am about to flip into flower.

    Current veg temps are 77F and 70%RH.

    So my question is do I still following the VPD chart when its time to flip?

    I know the RH needs to be alot lower in flower but if i drop the RH do i also need to drop my temps?

    Donny_Danko replied 2 years, 9 months ago 5 Members · 4 Replies
  • 4 Replies
  • victorytoker

    December 7, 2020 at 1:40 am

    I use this one throughout. Great results.

  • dtothab

    December 18, 2020 at 2:05 am

    I agree with victorytoker. I looked at numerous charts today and noticed if you’re within 75-78 degree temps and 60-65% RH that would be optimal. That’s what I have mine set at now.

  • JohnnyHappySeed

    August 4, 2021 at 9:12 am

    Thats one thing i dnt understand about growing. Vpd and its charts. Im in early seedling stage and my RH usually hovers around 58%to 65% with a few short jumps up to 70-72% for maybe 30 min. Temp 69 at night and 75 at day. Is that good?

    • Donny_Danko

      August 14, 2021 at 6:24 pm

      That’s the decent range for veg for sure. See the vpd can be a bih to try n chase if you’re not experienced asf or deeply dialed in. I try to keep my RH higher and highest at 60%-70% during seedling veg. Then drop down as the plants life goes.

      During the life of the plant I naturally drop those temps down with the RH to simulate end of summer fall months. This is where I go down from 65% range to transitional period to flower 60% down to 50% and 40%-45% those final weeks.

      Temps drop too, I drop them both from their daytime highs as well. 10 degree swing down to help w the moisture from no lights on. Remember those yellow numbers are where u REALLY will be most the time for optimal daytime environment I found, you will do fine not being in the green 💯