Lazerus00
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Yes the plant respirates more. The stomata open up completely. This will make for a nice healthy plant. The tissue becomes impenetrable to fungus, mold, even insects. Keep good air circulation. I've flowered in 75% with no problem. The plants grow like crazy.Hi So I have been running a perpetual cycle for some time and I have just started to look into Vpd. My veg is always a constant 78 f and Rh of 60. Our flower is set to 75f and we try to keep the Rh around 50. These are day time levels and we seems to be doing fine. I would love to run the humidity higher but too much risk of fungus and mold developing. We do notice that we have to feed more often due to the plant giving off more h20
if you get bud rot, then you are not employing good grow room practices, are you got a shady pheno that has very little resistance to pathogens. I would cull and replace with something worthy of being in that spot. My urkle crosses loved the higher rh, vpd... I will never change back.. All the lies about higher rh that I have read online.. no wonder ppl are scared.I just set my dehuey to 50%, over 60=budrot, under 40=wilted veg growth and twisted leaves
Wrong.. That is fake news.. The reason you had bud rot was due to it spiking, and the high temps AND high rh.. See you just said what your problem was. You aint dialed in. My ac is on when ever auto pilot says, along with dehuey, huey, c02... No spikes, no oops it got hotter than I thought. If someone is set up or dialed in, vpd and higher rh IS THE WAY to go! If not, well your looking for problems anyway...I had budrot last run and I have more fans than I should need. My temp and humidity got up above 80F and 65% a few days when it wasnt warm enough outside to kick on the AC. If you have the mold spores in your air and your rh gets over 65 a few times you get bud rot, had it twice.
So your sayinh bud rot isnt a mold, isnt caused by spores that may or may not be present and having a high rh in flower wont get your buds grey and fuzzy?Wrong.. That is fake news.. The reason you had bud rot was due to it spiking, and the high temps AND high rh.. See you just said what your problem was. You aint dialed in. My ac is on when ever auto pilot says, along with dehuey, huey, c02... No spikes, no oops it got hotter than I thought. If someone is set up or dialed in, vpd and higher rh IS THE WAY to go! If not, well your looking for problems anyway...
Im not saying anything about spores not being present. Im saying that high rh is not the sole reason for bud rod, or pm. Im saying that running higher rh is BENEFICIAL to good growth, AND, is safe as long as certain principals are being followed. And he asked about vpd specifically. Saying dont go above 60 % will cause bud rot IS JUST NOT TRUE! I just did it! And its was my best smoke and poss the best smoke I have ever had. I guarantee its top 3... And I contribute that a lot to the vpd, and my laid back low ec i ran...So your sayinh bud rot isnt a mold, isnt caused by spores that may or may not be present and having a high rh in flower wont get your buds grey and fuzzy?
You know, im not for sure why you would want to follow the vpd the last 2 weeks. I be honest, cause I dont know benefits. I deff dont have a PhD.Woah woah woah! Things kicked off in here while I was doing some of my sleepz! Lots to respond to!! So leaving aside the above disagreement about budrot bc I am also in the belief that high RH grows are possible with good, consistent, and clean growing practices. So about a higher RH in flower. I can understand why you might want a higher RH in the beginning of flower but don't really understand wanting it for the 2nd half of flower. I have always had the belief that a lower RH has been shown to increase the plants drive to produce trichomes and be that greasy jewel we all want in our garden, at least thats what I have experienced. The higher RH in the beginning deff helps your plant grow to the fullest of its potential, especially when correctly supplementing co2. But what are your reasons of wanting such a high RH (anywhere near 60% and above) for final bud development? What benefits have you seen for your plants in late flower? I hope in no way this comes across as anything but inquisitive, I'm just curious to hear about the subject!
Excellent advice and i concurI agree with both points honestly. If your plants SAR is high which a plant respirating and processing at full capacity should have, the brix should be so high that mold or mildew can't even attach to the tissue.
However sometimes our plants do see some weak moments and this is why a lot of people avoid high humidity. This is when the mold and bugs get in.
Many things along with cannabis thrive in high humidity. Just ask my broad mites. They loved it last run. I don't think they'll be returning from their neem showers.
This is a risky move but I personally had no issue with mold and the plants vigor doubles. Would I advise it and tell you 100% you won't get mold...nah. gotta keep them plants happy and healthy to avoid the mold.
I like old leadsled. He gave me a great quote.
"Pests are nature's garbage collectors and disease is the clean up crew."
I won't argue one way or another.
@DrMcSkunkins is just playing it safe which I totally understand. To some the risk outweighs the benefit to others the benefit outweighs the risk.
Josh steensland pointed out that his plants produce more co2 than his tanks are set to at night when running 75% during flower.
I dont see vpd being a good thing for perpetual.. I would go with 50% IMOThanks @Organikz for chiming in, your opinion valued!
Yes @DemonTrich I am starting to see that running perpetual, all I could do is use the VPD chart as a guide to give me a rough outline. I am prolly not ever gonna be perfect on it but I gotta listen to my veg/flower tent as a whole since I am choosing too run multiple strains. I got to see what works well for the biggest number of plants at any given age....thanks for helping me work this out guys!!!
Yep, its freaking expensive to get it set up right. I try to take a couple weeks worth of thought before getting on amazon.. But I promise you, when you do get to run vpd, you will be sold. Is there a chance for mold, yes most deff, but it requires more than just higher rh. Ive always been one to push the envelope. I went straight to hydro, knowing that everyone was saying, Dont do it, you will get mold.. lol ok I made a joke there... My point beiung that a lot of ppl said, i was stupid to try hydro first, and I would fail miserably. And that was after dropping 800 on a system and other equipment..I just dont have the luxury of mini splits and seperate environmentally controlled rooms. I have two tents in my moldy ass basement that has direct acess to crawl spaces with dirt floors. If I dont run the dehuey my rh gets over 65% at night, I just went and bought one when I saw a few spots on the largest buds from my last harvest that were just starting to get grey and fuzzy. I try to keep my temp aroung 75 with my central ac, maybe next tax season Ill be able to frame off a few rooms.
That is a fair assessment, and I follow that, except before c02 my temps were 74 and 65% rh. But im going 75% rh in veg and first 3 weeks of flower with my c02 now. So I put my money where my mouth is...I am pretty sure the vpd. Hart is meant for Greenhouse growing of tomatoes.
I run a multi strain multi stage perpetual and use 77 as a max temp and 60% max humidity indoors.
I need a humidifier and dehumidifier depending on season and weather here.
And proper air circulation is key but at 70% rh I would worry about mold. So I don't risk it with the meds.
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