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Home Growing Cannabis

Vapor Pressure Deficit (VPD) and Cannabis Cultivation

September 11, 2020
in Growing Cannabis
15
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A deep dive into Vapor Pressure Deficit (VPD) and cannabis plant growth. Nadia Sabeh​​, PhD, PE, LEED AP ​Owner, Founder of Dr. Greenhouse, Inc.

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Comments 15

  1. John Kunn says:
    6 months ago

    People like Nadia: 10/10. Next level West Coast growers: 10/10. This video as useful educational material: 4/10.

    Reply
  2. Mopeace Productions says:
    6 months ago

    Thanks for this now as a person like me a beginner grower I w I uldhave to get a instrument to use the VPD CHART? Is there another way I can do this if I Need,? If I can't equipment? And again thanks for this lesson #YouDig

    Reply
  3. Fueiskxg Tsiwjzfg says:
    6 months ago

    Omg

    Reply
  4. The school Of crop says:
    6 months ago

    Wow amazing video thank you very helpful

    Reply
  5. Jason Simmons says:
    6 months ago

    Sorry but she doesnt know what she is talking about when it comes to botrytis. Seems like she thinks its just passive mold growth on stressed plants. No, if you have a susceptible variety and inoculum in your growing area, following the vpd curve wont magically protect your plants. Its generally an okay guideline (recommends around 50 percent humidity in warm conditions.) I would say go down to 40 in the last 2 weeks. Saving some on your hvac bill isnt worth losing a full crop due to testing positive to botrytis.

    Reply
  6. AllXDup says:
    6 months ago

    Not a word about leaf surface temps, which is a major factor of VPD.
    Think of a triangle, where you have to keep 3 factors constant within a parameter-
    air temp at top of canopy
    Relative humidity at top of canopy
    leaf surface temp at top of canopy
    you are looking to maintain 1-2 degC cooler leaf surface(LST) than ambient.
    Everything can look fine in the numbers if you ignore LST, but maybe little growth..
    then you check LST and find it is 5-6 degC below ambient,
    then you realise why LST is also on the VPD chart along with air temp & RH.

    Reply
  7. matanuska high says:
    6 months ago

    Vpd is scary for cannabis for sure. Finding the happy middle. I like my humidity 55% but temps in mid to high 70s. If I get over 65% I worry and when lights shut off the the humidity should stay below the temp as if it goes above the temp that can cause issues. Juggling the VPD take the proper equipment and can be expensive on a large scale. Humidifiers dehumidifiers a/c and heaters etc are all needed to keep your humidity in check

    Reply
  8. Diodes says:
    6 months ago

    "Do people know about VPD?"
    What kinda question is that? What amount of quality information can be derived from such an arbitrary question? Her response to that alone consumed 2.5 minutes of your video!

    Her response in a nutshell: Yeah sure, but lets educate 'em some more.

    Reply
  9. Lucky Situmeang says:
    6 months ago

    Ah.. thank you very much for sharing this knowledge to every one.. i have been playing with vpd in my grow tent for a year now.. i have better understanding now..

    Reply
  10. IndicaHeadshop says:
    6 months ago

    Great information very knowledgeable 🌟

    Reply
  11. John Doe says:
    6 months ago

    NICE

    Reply
  12. Kooj c says:
    6 months ago

    Common sense would say osmotic pressure will have to be taken into consideration as well? How do the 2 relate??

    Reply
  13. Jeff Lanz says:
    6 months ago

    Thank you for the knowledge drop I live in canada and in the winter I have a hard time keeping rh over 25 % and definitely noticed a nutrient deficiency I think it's time to get a good humidifier and if I understand right around 50 % rh at 70 degrees Fahrenheit should shock the plants less ??

    Reply
  14. daryl says:
    6 months ago

    when i did vdp my garden went to next level

    Reply
  15. Jonathan schadenfreude says:
    6 months ago

    spring in vermont can be interesting ………great video

    Reply

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