What percent humidity in the lung room for drying.

[Plant_operator]

Question on drying. So say I’m drying in a tent, with the exhaust fan on lowest speed, small circulation fan moving the air around on bottom. I was using the temp/humidity probe on the acinfinity controller to monitor the % humidity in the tent.
Long room can be maintained within 5% of what I set it on.

I had the probe kind of hanging in the middle of all the hanging drying bud.


I guess the question is, do I just maintain 60% in the long room, and ignore the higher percentage humidity that it shows in the tent?

I just finished a harvest, first one in about 20 years, and I ended up setting the dehumidifier down to about 50%, so I could maintain 60% in the tent.
I am wondering if this was the wrong move? I really wanted a 14 day dry, but ended up around 9 days or so, and actually slightly overdryed it.

What do yall experts think?

 

[FloridaMike]

Question on drying. So say I’m drying in a tent, with the exhaust fan on lowest speed, small circulation fan moving the air around on bottom. I was using the temp/humidity probe on the acinfinity controller to monitor the % humidity in the tent.
Long room can be maintained within 5% of what I set it on.

I had the probe kind of hanging in the middle of all the hanging drying bud.


I guess the question is, do I just maintain 60% in the long room, and ignore the higher percentage humidity that it shows in the tent?

I just finished a harvest, first one in about 20 years, and I ended up setting the dehumidifier down to about 50%, so I could maintain 60% in the tent.
I am wondering if this was the wrong move? I really wanted a 14 day dry, but ended up around 9 days or so, and actually slightly overdryed it.

What do yall experts think?

65% inside the tent would have given you a longer dry. Potato peels (neutral)
or apple peels (w/ aroma) sealed in the jars for a day or 2 will bring it back some,
as will the stems if not completely dry.

Opinions vary on this. I'm curious what others have too say.


Oh, welcome to the Farm!

Wait, what?





I ain't no expert!

 

[Captspaulding]

Say my friend it’s not like you were far off the way that I roll with it. It’s just that 62% number. closer you can get to that and maintain it for as long as you possible. I go after the same thing in the jar. You just wanna have everything hanging out by that 62% ensuring that not too hot to speed drying or possibly coax a long some type of mold. And you don’t want it to get 55° ( in some more sensative
Strains ) because then it starts to actually break down the cell walls of the plant matter it gets exponentially worse farther down towards that freezing 32 degree mark.
It’s all about trying to draw the moisture that is in the innermost part of the bud as slowly and consistently as humanly possible. I try to keep my temperatures down by 70° the entire drying process with indirect airflow and ventilation tuned for humidity.
The laundry you can do this, the more flavorful your bud

 

[JIMKSI64]

Hung at 62% at basement temp of 66-69 f

Hung until stem snaps on a bend. Important to have consistant sized buds or they will dry at different rates. For smaller runs and buttons I placed them horizontally on a screen so they were touching and just acted like a bud run.
970 grams havested. 820 hung. total yield 7.5 zips.

first success. This is the 3 jars of trim and larfy buds.ade excellent brownies.

 

[FloridaMike]

Say my friend it’s not like you were far off the way that I roll with it. It’s just that 62% number. closer you can get to that and maintain it for as long as you possible. I go after the same thing in the jar. You just wanna have everything hanging out by that 62% ensuring that not too hot to speed drying or possibly coax a long some type of mold. And you don’t want it to get 55° ( in some more sensative
Strains ) because then it starts to actually break down the cell walls of the plant matter it gets exponentially worse farther down towards that freezing 32 degree mark.
It’s all about trying to draw the moisture that is in the innermost part of the bud as slowly and consistently as humanly possible. I try to keep my temperatures down by 70° the entire drying process with indirect airflow and ventilation tuned for humidity.
The laundry you can do this, the more flavorful your bud

I stand corrected. My bad on giving a wrong number, I just have 65 stuck in my head (Mandela Effect or major brain fart?). My last batch I had to dry in a bathroom at 79-80f with both a humidifier and dehumidifier going to keep it between 60 & 65 (humidifier won't auto off, so I had to improvise). It still dried too fast, but it is turning out really good after some curing time.
It's just so damn hot and dry here, I'm not used to growing in it yet.

 

[ATLien415]

Only once your temperature in the lung room is perfectly predictable or stable for all intents and purposes, then do you worry about relative humidity. The RH is basically a bastardization of what we really want to be controlling here, and that is the dew point. Controlling the dew point allows you to then apply basic curing theory (like archival of books, meat production, cheese production, and a million other things). Dew point theory essentially controls where water forms, and thusly strictly controls the environment in terms of mold. In fact, dew point theory is the only system which can hold cannabis in storage in perpetuity. Cannabis is not special in this regard at all. In face, if your temperature is constant and you know the RH then you know the dew point. You are essentially going off dew point by using RH, but have multiple solutions to each instance until you hold the temperature constant.

In general I keep mine, in terms of RH, at 59% and the temperature at 70F (that is as low as I can reliably keep the lung room). Thinking in terms of mathematics and convergence, if you bake a cake at 350F then that cake never reaches 350F...it effectively converges there at time infinity, but time 999999999999999999999999999999999999999999 years it is not at 350F. From that perspective, you'd be in iffy territory having an RH at or above 60 in your drying room...(without dew point theory).

And yes, it works, but the mechanism though for the peels would almost certainly be ethylene gas, right? Like it just has to be.

 

[Plant_operator]

Only once your temperature in the lung room is perfectly predictable or stable for all intents and purposes, then do you worry about relative humidity. The RH is basically a bastardization of what we really want to be controlling here, and that is the dew point. Controlling the dew point allows you to then apply basic curing theory (like archival of books, meat production, cheese production, and a million other things). Dew point theory essentially controls where water forms, and thusly strictly controls the environment in terms of mold. In fact, dew point theory is the only system which can hold cannabis in storage in perpetuity. Cannabis is not special in this regard at all. In face, if your temperature is constant and you know the RH then you know the dew point. You are essentially going off dew point by using RH, but have multiple solutions to each instance until you hold the temperature constant.

In general I keep mine, in terms of RH, at 59% and the temperature at 70F (that is as low as I can reliably keep the lung room). Thinking in terms of mathematics and convergence, if you bake a cake at 350F then that cake never reaches 350F...it effectively converges there at time infinity, but time 999999999999999999999999999999999999999999 years it is not at 350F. From that perspective, you'd be in iffy territory having an RH at or above 60 in your drying room...(without dew point theory).

And yes, it works, but the mechanism though for the peels would almost certainly be ethylene gas, right? Like it just has to be.

I ended up being able to maintain the temperature in lung room at a constant 65°.

With the humidity, I put the temp probe right in the middle amongst the hanging branches, not touching, and that’s the point I tried to maintain at 60%. But to maintain 60% at that monitoring point, I had to run the lung room around 45-50% humidity.

I guess I’m wondering if I should just maintain the lung room at a consistent 60% (exhaust fan speed 1) and ignore the RH in the tent for the first week.


At this point I’m just curious about it, because I’m pretty certain I’m going to build a diy cannatrol out of 1.5” foam board before my next harvest. I will definitely do more research on dew point as applied to cannabis.

 

[Grownsince95]

The rh in the tent is what matters first, then the lung room. If you put the probe too close to the plants it will skew the reading high. Make sure the air circulation is good without blowing directly on the flowers and the exhaust is key.

The drying plants are going to raise the humidity a lot so you just have to make sure the exhaust can exchange all the air in the tent pretty quickly. I set my ACI exhaust to trigger at 62% rh on speed 7 and let it just cycle when it needs to. My lung room usually is pumping in 50% rh air. I also made a smaller version for curing from a 30 gal tote, a pc fan and an inkbird controller and it works great.

 

[JIMKSI64]

My lung room was 66-69 and low humidity like 48% .I use the cloudforge and thermoforge so turned off heat and set it to 62%. Sweep fan moved to bottom of tent nothing within 24 inches. Top Exhaust at setting 3 like 15k a week. From journal 10 days hanging for dry. Did overdry some buttons should have pulled em but only lost a few to the trim bin as I was checking every day.

 

[Hoffman]

Helloo, súper interesting post! You can grow a frosty and bigger flavorful, but this part could screw all cultivar un a couple of days.. sometimes prefeer to slow dry Mb 7/21 days trying to not overdry thats a Classic one..but came here to looking for answers too.. nobody on earth deserves that hay/grass smell on their final product .
Personally most difficult/anxiety part of cultivar.
Hope You get Nice buds bro

 

[Captspaulding]

My lung room was 66-69 and low humidity like 48% .I use the cloudforge and thermoforge so turned off heat and set it to 62%. Sweep fan moved to bottom of tent nothing within 24 inches. Top Exhaust at setting 3 like 15k a week. From journal 10 days hanging for dry. Did overdry some buttons should have pulled em but only lost a few to the trim bin as I was checking every day.

Hung at 62% at basement temp of 66-69 f
View attachment 2455643Hung until stem snaps on a bend. Important to have consistant sized buds or they will dry at different rates. For smaller runs and buttons I placed them horizontally on a screen so they were touching and just acted like a bud run.
970 grams havested. 820 hung. total yield 7.5 zips.
View attachment 2455646
first success. This is the 3 jars of trim and larfy buds.ade excellent brownies.

You’re doing it right buddy

 

[Captspaulding]

The rh in the tent is what matters first, then the lung room. If you put the probe too close to the plants it will skew the reading high. Make sure the air circulation is good without blowing directly on the flowers and the exhaust is key.

The drying plants are going to raise the humidity a lot so you just have to make sure the exhaust can exchange all the air in the tent pretty quickly. I set my ACI exhaust to trigger at 62% rh on speed 7 and let it just cycle when it needs to. My lung room usually is pumping in 50% rh air. I also made a smaller version for curing from a 30 gal tote, a pc fan and an inkbird controller and it works great.

Yeah, tents can be sketchy for novices. I prefer to grow and to dry outside of them, dude, if you can help it it’s just a better way to go. If you can’t I completely understand you just gotta be on top of shit. It’s always nice to have a digital controller that hooks up the Wi-Fi so you can monitor things from a distance if you’re helicopter parent, once you get it figured out and you have it tuned in with the ambient temperatures in your home historically, then you can set it and forget it and walk away and sleep peacefully, but even then tents can be sketchy,
Power Outages for prolonged periods of time can definitely be detrimental as well. Let’s see if you live on a farm or something and you have a bunch of livestock to attend to or things that would otherwise take your attention before getting to your plants outside of a tent at least gives you a bit more time before any funny business could occur if you’re a stoner that isn’t always on top of shit immediately in moments of intense stress