VPD - What is Vapor Pressure Deficit

VPD - Vapor Pressure Deficit is more then just having a hygrometer in your grow room.
It is about knowing the ideal humidity and temp while working with other environmental conditions to create the ideal growing environment.
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Chapters:
0:00 Introduction:
0:05 Vapor pressure deficit
01:30 (What is VPD)
03:40 Plant deficiency in Plants
10:15 VPD measurement
19:07 Ideal VPD clones
20:28 Ca deficiency
#organic #soil #cannabis #organicweed #vpd #bottomwatering #wormcasting #gardening #organicgarden #legalcannabis #medicalmarijuana #420 #homegrown #cannabiscommunity #perfectgardens

[@newf7093]

thank u so much for this..once I figured out that little bump and fixed my humidity, my plants have come a long way..I am now 3 weeks plus a few days into flower, stretch has now slowed significantly and they look absolutely amazing..they both now almost 5 feet tall and budding oh so beautifully..I am hoping to possibly(as long as things stay well) doubling my last yeild(first ever grow) of 9.4oz off 2 plants..with thanks to all of u guys to answering every question with great detail every time!! theres only so much research u can do on ur own, and sometimes its just best to ask someone who's been there and faced it all..Mark, ur videos never disappoint and always very informative!

[@PerfectGardensTV]

That was very kind. Thank you :)

[@robertthrem3382]

At one point the red light when they start flowering will make them stretch a lot use more blue.

[@newf7093]

@@PerfectGardensTV 😊

[@newf7093]

@@robertthrem3382 thank u..ill definitely remember that 😊

[@olswole3658]

How did you fix your humidity? I tried putting a dehumidifier in my tent and it rose my temperature to over a hundred degrees. Fixed my humidity but my temps were way out of range. Took out dehu and fixed temps but humidity shoots back up. I got fans blowing in there, good strong air flow. AC infinity 8 inch fan sucking out at level 6. VPD with LEDs is like chasing after a rabbit. I’ve gotten better nugs out of fluorescent lights. Running two hlg 600 rspecs. Might get a half lb out of a 5 x 10. Sad and pathetic.

[@anthonyromano8565]

Just started paying attention to it.

[@coolhandluke1503]

As an outdoor grower, I'm not so ignorant to dismiss this without listening. Just because I cant control much of my environment doesn't mean I can't use this info to help diagnose issues. I've had a lot of rain for this area about a month ago (close to flooding, I live on the flood plains in Queensland Aus, were we sometimes get washed away) and the humidity has been extreme, so up until now I've been diagnosing, these phantom soil deficiencies that I've never had, in the plants, trees and even some grass, but now it all makes sense and now I'm hoping the trace elements foliar spray I've been using doesn't come back to bite me. I love these nerd out sessions with Mark, tha fam at PG and friends. TY.

[@chris432t6]

All about balance. It's the reason we exist and flourish. Good stuff here. Thank you Mark.

[@PerfectGardensTV]

Absolutely!

[@bobmurphy9651]

I am a new indoor grower and I learned more from this video than any other that I have watched. Thank you.

[@scottinsierras2945]

I used VPD, during my last grow, using my new ROI-E680 8 bar LED and monitored VPD multiple times everyday. My first time using it. I used the VPD calculator and the Infrared light meter, checking leaf temperature at multiple locations. Not sure if it helped or it was my new light success, but I think it was a very positive condition that we should all try to achieve. I’m going to always try to be close to those spec’s going forward during the 3 life cycles. Glad I saw this video!!!! 👍👍

[@PerfectGardensTV]

thank you for posting:)

[@robertwatts5071]

Right on I just got a temp gun for x mas and checking temperature at the leaf probably makes all the difference in getting a correct vpd reading 📖👽

[@1fast72nova]

One of the best videos I've seen in a while. Very good. Very

[@PerfectGardensTV]

Ty

[@AtomicHighJinx]

Thanks mark for making this video. This has helped me alot,You guys done a great job breaking it down.

[@ghostgrowz9750]

Incredible video appreciate the solid knowledge you all bring to the industry

[@Canabis_Cal]

Was waiting on this video. Ty

[@sweetleaf9668]

I been using the VPD chart since I started growing after listening to a lecture on such, not long ago, lol. Still a noob. This video has added to that knowledge and hopefully will increase my quality and quantity of grows in order of magnitude. I think it really helps in my grows. More of this dude (expert) please! Great video's as usual. Just joined as a silver member. Thank you for all the knowledge and for making a great channel.

[@cujo5858]

Always learning,,, I love it. I've been growing for 5 years 🌱🌿🌲,, and this video sure is polishing up the knowledge I've learned.

[@twobeards6714]

VPD other than genetics, light and feeding is probably the single largest factor in producing truly great flower. I've been getting much better growth density and flavor. Also, your interview style is great I watched this three times. 5 weeks have passed and I harvested 4 narcotic Kush aotoflowers. Two were in a room where I was able to keep vapor pressure at a pretty consistent level of "1", RH versus temp. The other two were left to mature without adherence to VPD. The VPD room had denser buds and produced 1.5 times the finished weight more than the non VPD. I'm into cure now and am impressed with my test flower grown under controlled VPD conditions. I'm curing now and actually have a side by side flower to compare. I'll b try and update again when the cure is done. I'm working off the Pulse chart that you have in this video.

[@ickeberlin6364]

Thank you very much. I've learned a lot from this video. Greetings from Germany 💚🌍🥦

[@Jordan56484]

This video really helped a lot! Thank you!!

[@PerfectGardensTV]

Glad it helped!

[@42organicgrow10]

I have been looking for a good explanation of vpd , how it works … Thank you so much , really you explained it amazingly!! Turns out that I’m exactly where I should be at !

[@BuckWeed]

A must know if growing autoflowers. Thank you

[@Huskie-]

Learnt a Hundred things from the last few videos 👍

[@PerfectGardensTV]

Excellent:)

[@mr.turnersneighborhood1741]

Once again great topic and show guys, thanks again 👍

[@PerfectGardensTV]

Thanks again!

[@terpsmith822]

I’m not chasing vpd, I’m running 85-90* 20-40%rn with day 75-80* at night. It is more sensitive to light burn due to dryness in week 6 flower but raised light to finish. Great video I usually have humidifier and temps dialed in but wanted to see what happens for content. surprisingly it’s doing pretty good

[@jacobchang4588]

This videos is very succinct and valuable

[@PerfectGardensTV]

ty bro

[@jacobchang4588]

@@PerfectGardensTV one factor that I have yet to see explained anywhere is how CO2 level affects the VPD formula. Haven't seen a VPD chart that incorporates CO2 level either. Mark, it would be great if you can pose this question to the guest next time.

[@STONERY-BAND]

Great video love the valuable information 👍🏻👍🏻👍🏻😎

[@PerfectGardensTV]

Thanks 👍

[@mikecolemcole3]

T Y really good info . Well done .

[@papashakeshake6268]

using vpd is your friend in keeping growth to it's max.

[@youngnixx88788]

"I'm not just strokin you man" Bruh I'm dyin 😂😂😂😭😭☠️☠️☠️

[@PerfectGardensTV]

lol

[@tacosforus1688]

Great video

[@davidsalmela1563]

✌❤from Arizona. Had to watch a couple of times. Slow learner! Very interesting. Growing on the cheep here, have to look at the chart for better understanding!

[@davidsalmela1563]

I get it now. Have to get humidifiers. It all make sense now. Feel like such a rookie. Thank you. The information is very valuable. ✌❤

[@streetfighter0177]

There's a controller 67 the (69 comes out soon) but is a very cheap source of monitoring vpd and/or fan controls. I found the pulse VPD numbers were a little different but also running the pulse so I see the happy plants and fast growth and i know its working. Thanks again for the knowledge 😃

[@PerfectGardensTV]

thank you for comments and feedback:)

[@crustycorvus2478]

Their controller 76 is actually more handy for this topic, it will control humidifiers, ACs, heaters or fans based on climate settings.

[@guido-tx1el]

great video .. lots of great useful information ,ive learned a few things i was uaware of .. thanks

[@PerfectGardensTV]

Glad it was helpful!

[@JustinHappy-ck7dd]

Very nice video, is the VPD base on the leaf temperatures or base ambient temperature? Thanks

[@comfortablynumb9342]

This is definitely interesting, thanks. But I wonder how many beautiful plants have been grown by folks who never heard of VPD?

[@PerfectGardensTV]

A lot! Im one of them;)

[@boognish593]

They adjusted things by trial and error and were either at a decent vpd to begin with or were making corrections required for too high or low vpd without realizing it.

[@swayzecrazy420]

I get nice tight flowers.

[@Ethosworld2021]

Really interesting but I'm still wondering why we want the water/sap going into the plan faster in flo than in veg? (vpd higher in flowering)

[@nelsonsilva9966]

Good value

[@robertwatts5071]

Hey I thought 💭 u checked out 😃 glad to hear from you great 👍🏻 topic 👽

[@Entsfarm]

Amazing info! I really appreciate your content!

[@PerfectGardensTV]

My pleasure!

[@petethefeet0]

Hey dude loving the videos, any chance you can do a nutrient breakdown on the Veg + Bloom range of fertilisers

[@streetfighter0177]

I'm curious if the temperature during VPD weather it's perfect at a lower temperature or perfect at a higher temperature, does the opening of the stigmata change. I know that if I'm warmer I will drink more and/or uptake more. They are both in range and will supplemented C02 be limited by this different in temperature also? Thanks again for your time and effort I really do appreciate your hard work and sacrifice.

[@djsipp4743]

This video never showed up in my KZbin notifications🧐 "KZbin stop blocking good information we are learning here"

[@PerfectGardensTV]

ty bro:)

[@larryi9373]

During my last grow I definitely seen the uptake of nutrients much better after having all the elements down (essentially needed to feed less), question I have is the transition from completion of flower to drying. Since I have higher temps where I live (above 90), I had to kick up the humidity to hit that 1.1 range which did not result in any powder mildew but do you think there is a shock that occurs since we can’t take the same logic of VPD in drying and need to reduce the temps significantly?

[@PerfectGardensTV]

shock is when a drastic change happens that causes other issues. I only see it being a problem when you see a ca def or pm

[@visible720]

I did learn alot. But im not sure if I missed this or it just wasn't said. But what is the ideal leaf temp? With and without co2?

[@kingtim420]

Hi Mark great video once again this info will help me huge. I also wanted to ask you if running a gia green system when should be the last Time I top dress in bud ( 8 week strains and I'm running the flower mix). Also if you are 100% organic is there a need to flush?

[@ryanhollenbeck2657]

No flushing with organics

[@TheTank8]

Is there a book that you recommend on this?

[@fadedmass1662]

I've seen a number of VPD videos now and I noticed that there is very little conversation as to what the ideal numbers are for cannibus. I just here "high" or "low" without any numbers. I have the chart and see the green range. But that range is very big in my opinion. I been aiming for roughly 1.1- 1.3 based on the chart I have, what I think I know, and the phase of the plant.

[@fadedmass1662]

I need to make a correction. I started doing things right by using a VPD calculator and not just a chart. Also i began to take the temp of the leaves and not just the air. I been around 0.40 - 0.80 while in early veg this past week.

[@LRG944]

i've seen literally plants going to rest mode after 17 of light hours do to they reached there threshold for the day vpd and co2 go hand and hand

[@assog5737]

Another good video Mark. Stays on point the whole video. One thing I would like to point out, in regards to the charts that you showed. And the charts that I have tried to use. From my experience with these charts is that the temp's and the percent of humidity are WAY to high. Like when this guy said to have your temps at 85. Like he said people worry about losing terps. But he acted like you shouldn't worry about it. I must disagree. That is way to hot. And your quality will suffer. Also in regards to those charts is. When I walk into my flower room. And I can feel the humidity. To me that is way to high. If I can feel my pours closing because of the high humidity. What do you think is happening to your plants. In my opinion all these charts are garbage.

[@PerfectGardensTV]

well said:)

[@shaunsimmons634]

I just go high temps more water more humidity add co2 high temps dry no co2 more water in pots a lot more often I don’t always fill humidifier and winter is dry but I am running co2 and my temps get high sometime and plants drink but now I water from bottom to ensure they get plenty

[@DogSaveTheBreen]

Just keep your humidity at 50 60 and your temp at 75-77 with a breeze, 40 rh and 7 fans will dry your plants to death 4:30

[@deneb3552]

Just using a box fan to blow air in most of the time could be a reason my buds are rather small? Guess I should use the top vent out a lot more? Healthy plants with small buds, so frustrating. I'll get there though, it's a journey.

[@charleslyons829]

I dont think it's the fan.....I think your bacterial and fungi are not in an ideal situation to upload nutrients. Suggestion: Recharge. I think using an exhaust fan at the top of your tent will help with temps and humidity as heat rises. Use an oscillation fan on the floor of the tent to help push temps down as well as humidity. I also think you need an ppm meter to get your plants closer to the range they need to be in for what ever stage of growth they are in.

[@stephcoleman5248]

So I have a ac infinity controller tht reads a consistent vpd of 0.8 Wht should I do to get it to 1.8 as I am in week 2 of flower

[@kittywampus]

Lower your humidity

[@marktaylor688]

Don’t lower your humidity….if you’re VPD is too low you need to raise it. I know for me, the optimal VPD chart (for flowering) calls for a much higher relative humidity than I’ve ever ran. Week 2 of flower, under LEDs the best temp is 80-84f w/ a RH of 60-65%. As you progress in flower it’s best to lower both incrementally w/ your last 2-3 weeks in mid 70s w/ RH around 45%….

[@kittywampus]

@@marktaylor688 I think you have it reversed. Higher humidity, if temp remains the same, will give you a lower vpd. I just sprouted. I'm at around 75°f and 70% humidity. As I drop my humidity my vpd rises. @steph Coleman If you are using the AC Infinity controller you'll see the change. Make sure you use the leaf temperature offset to be more accurate.

[@stephcoleman5248]

@@kittywampus yes this was true I took out the humidifier completely and my humidity went from 73 to 59 and the vpd went from 0.8 to 1.3 I think I’m gonna leave it like this as I have a separate group of autos only in week 3 in the same tent. Thank you

[@Eric-dz1we]

Is there a nighttime vpd chart?

[@PerfectGardensTV]

Not sure, i don't think so

[@tonyfeuerhelm]

After many, many hours of video review...after...review with Dr Bruce Bugbee here on You Tube. It's a little scary to think that It's starting to make sense_PPFD_VPD_PPM_etc. I think I should become a member of Perfect Garden. Mr Av Singh in no time at all has connected a lot of the "dots" for me. Not going to sweat my plants getting into the low 80s anymore. My high temp alarm was at 80 causing me to man the fans often. Lot less work/hassle for me. Been maintaining good VPD for my last two auto grows knowing that it was important but not really knowing why...A.C.Feuerhelm

[@PerfectGardensTV]

Join you may like the membership:)

[@chela7771]

I use 5% of additional far red and I think it heats the leaves excessively compared to a PAR without 730. .. having a staggered VPD and a lot of transpiration which definitely compromises the terpenes (strangely little odor with lots of trichomes). I also see leaves with raised tips due to little water and salt concentration) high EC) with the first signs of calcium deficiency (mobile element) .. the terpenes are severely affected despite the trichomes we are abundant ... 20/23 cesius e 35/40 humidity. .... too much perspiration ... I remedied with mulch or mats that block rapid evaporation ... I wet every other day

[@CornPop309]

That's one thing I have never and probably will never concern myself with..maybe when I get everything else perfected, I just don't see it making much of a difference in yield or quality if your temp and humidity are already good.

[@swankshire6939]

if your not in the proper vpd range then your temp and humidity are not good, just acceptable. aside from your light its the most important part of your environment. it wasnt a big topic but vpd has a direct impact on how much CO2 your plants take in, and how much water they go through. id go for vpd before most other things because everything is affected by vpd. its not hard to maintain or anything. a $25 controller and a humidifier and dehumidifier and im good all year Re-watch the video if you dont think vpd is that important

[@CornPop309]

@@swankshire6939 you're legit saying VPD is the most important factor for good weed after light? When people are just now worrying about it and have been growing amazing bud for years. Your vpd could be perfect but shitty nutes, schedule, training, airflow, Ipm, genetics, watering..you could forget about VPD like 99% of growers and probably not even have a noticeable difference cut out any of those and you're not gonna have great bud or yield. I dont need to re watch the video i agree it is something too consider but by no means is going to make or break your harvest like your acting. Happy growing tho homie.

[@PerfectGardensTV]

Great point

[@twobeards6714]

@@swankshire6939 I've practiced VPD contol in my last three grows. My bud has become denser and larger. I'm using clones from 3 mothers. The room I've been concentrating on with VPD monitoring produced almost twice the weight of trimmed bud as the one I just let go. I'm sold. Monitoring and trying to control temp and humidity is on my list of four things that I see as contributing to a productive grow. 1. Good genetics 2. Properly prepared grow medium. Adequate exposure to quality light. 4. VPD. Grow big💪

[@boognish593]

@@CornPop309 people didn't know about to even worry about it. They were likely already in the proper vpd range or had made trial and error adjustments to compensate for growing outside of a proper vpd range, they just didn't know it.

[@shaunsimmons634]

Trace minerals

[@gipen]

2-3 inch of grow per day, wow, I've never achieved that :( ... more like 0.5 in/day

[@PerfectGardensTV]

lets make it happen

[@robertthrem3382]

This is one video that requires you to watch six times unless your brain is stronger than mine 😂😂😂😂 maybe it's just that Maui wowie I have 😆😆😆 😂 I must be doing something right I never seen a bud that smokes like a chunk of hash.. maybe I should try the paper needle and cup theory to smoke my bud

[@PerfectGardensTV]

:)

[@chastheplayer8367]

Geez let the man talk..lol

[@mr.spliffaddikts9548]

Best VPD IS 0.4 ,0.8

[@PerfectGardensTV]

Sorry for the late reply I would also recommend using Drops of Balance and BAM will make a huge difference in your growth with photosynthesis Check out some of the reviews dropsofbalance.com/ dropsofbalance.com/collections/teraganix/products/bam%C2%AE-microbial-inoculant-concentrate

[@hisherbs8538]

What has five arms and sucks. Def Leppard

[@kriskalimon7657]

Is vpd an issue with led lights

[@hisherbs8538]

@@kriskalimon7657 if your light is hot enough I suppose it would. Ask mark.

[@kriskalimon7657]

One more ? Mast grow was og kush all went well ......till like week 5(flower) then things slowed down a bit and in the end found like 3 seeds out of say ahalf a jar. Same thing last grow. Soooooo I'm guessing light poison. Or temperature did drop to 63 a few nights. If you or anyone has any imput.i would be appreciated. I'm new to this texting thing so sorry for screw ups

[@hisherbs8538]

@@kriskalimon7657 I wish I could answer that for you. You're talking to a rookie and considering you have multiple harvest under your belt you're more accomplished than I am. I will ask your questions to a few guys I trust. I was just making a horrible Def Leppard joke. Mark or one of the perfect garden crew should be answering this.

[@craigmarshall6257]

Next time, please close your mouth and let the expert speak.

[@PerfectGardensTV]

It is a conversationbro

[@craigmarshall6257]

@@PerfectGardensTV I understand that, but you just keep rambling on about what you think you know, and wrinkled skin from a bath and on and on and on, like a little child that wants attention from his father. I suppose you were stoned, but still, it became unwatchable quickly. Anyway, smoke it up bro.

[@Maya-Elijah-Simmie-Kam_Dad_]

​@@craigmarshall6257 finally..... I've commented this before when Harley Smith was on, he kept cutting the man off 🤦🏿‍♂️