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!
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.
But I know I just did... And I also on top of that, ran my buckets dry the last week and made all my leaves that were left die and fall off. I then cut the branches off the plant and hung them for 14 days at 60* and 63Rh. down from 65RH last week. If over 60% rh causes bud rot, then why do we dry out plants at 63% rh for 14 days with HARDLY any air flow????? just saying...
Oh by the way, I didnt have to cure, it was perfectly dried. A lil advice a fellow farmer gave me here and it was spot on! You actually start the drying process while the plant is still alive...
Maybe, just a guess, that when I run my buckets dry, but have 60 rh it drys from the roots up, and from the inside out, EXACTLY WHAT CURING DOES...
See it all goes together for me. I wouldnt run over 50% if your room isnt dialed enough to combat spikes. Mater fact vpd is for dialed in room IMO
I 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.
Excellent advice and i concur
Thanks @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!!!
I dont see vpd being a good thing for perpetual.. I would go with 50% IMO
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.
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..
Then it was dont run a live res..
Wrong, it worked out great.
Then it was don't run over 50% rh in flower
My answer,,, Hey haters, you were wrong ,,, AGAIN...
So maybe, we should stop telling ppl that THEY CAN'T, and instead tell then, THEY CAN...
That is what is wrong with this world these days, we changing into sissys that play it safe.
Hell my mailman just left a note in my mail box, requesting that I move my mail box off my porch, so the mail man doesnt have to walk up steps, you know, the new trips, slips, and falls protocol... smh...
We are men.
We choose to go to the Moon! ...
We choose to go to the Moon in this decade and do the other things,
not because they are easy,
but because they are hard; because
that goal will serve to organize and measure the best of our energies and skills, because
that challenge is one that we are willing to accept, one we are unwilling to postpone, and
one we intend to win....
On September 12, 1962, President Kennedy...
Thats the motto my parents instilled in me...
I dont use vpd cause its easy, i do it cause i want to go to the moon :)
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.
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...
Hopefully I dont get smacked in it :)