Alright, the Forum Stomper F2 is in jars. After an 8 or 9 day dry, it seemed right. I experimented this time around with drying in a mini fridge I found on Craigslist. Guy was selling a 4.4 cu ft plate evaporator mini fridge for $25. Total steal, and I had been wanting to try this for a while so I picked it up during the grow and have been waiting for the chop.
While trimming, there was a pronounced beer smell as well as a fuel aroma that was completely absent during the grow. She smelled a bit in the tent, but it was sort of a generic weedy/clove smell. After sitting in the jars overnight, I’m getting some of the faint chocolate notes I was expecting for a GSC strain, but a decent amount of fuel/paint thinner. Total surprise and a real treat as I am a huge fan of diesel and gas aromas. Can’t wait to load some of this up and see how it hits!
For the fridge dry, I used an Eva Dry dehumidifier, a little computer fan and an environment sensor with Bluetooth so I could see what was going on inside without having to open the door, and to offer redundancy to the numbers from the controllers. I hooked up the fridge to my inkbird temp controller and the Eva dry to the humidity controller. Temp was set to 60F with a 3F tolerance, RH was initially set to 60% but eventually I just set this low to the point that it was always on. (I am going to reevaluate this decision, but for this first run I figured drier is better than mold. And since I didn’t hedge my bets at all and just shoved the entire plant in this experiment, I didn’t want to lose everything to mold if I could help it ) I also added a small DampRid container to the fridge for the first two days to help drop moisture out of the plant up front. This was removed to slow drying down a touch after the initial use. I removed all the internal shelves then cut some PVC 1/4” pipe to fit across the support for the top shelf, drilled some holes through it for stems, then used binder clips to pinch the stems after pushing them through. Since the system was closed, I figured I could increase internal circulation pretty high by using the computer fan. It has a variable speed dial so this varied between 5-8 speed (out of 10). I wasn’t really worried about overly dry spots so much as I was worried about pockets of excess moisture.
Some observations: the Eva Dry dehumidifier is by all accounts not intended for use at 60F. It is a peltier based dehumidifier. These aren’t known for efficiency, and they are worse at lower temperatures when the dew point nears freezing. Even still, in 9 or so days, this little unit collected a total of about 210ml or grams of water. For perspective, 4.4 cu ft of air at 100F can hold something like 6g of water vapor. At 60F that’s closer to 1.5g. While I was initially worried about opening the door and letting in humid air, looking at these numbers vs what the dehumidifier was pulling out put me more at ease. I still tried to keep the system closed as much as possible.
I haven’t weighed my herb yet but I will to try and relate this information to my next grow/dry experience. I should have weighed the plant wet as well to have some more data but it didn’t cross my mind at the time. Tbh I don’t think it’s that important or precise from grow to grow or cultivar to cultivar, but I do like the info for getting in the ballpark of how close things are to done.
The plate evaporator generates a lot of swinging in the RH inside the fridge, and seems to be very dependent on sensor & fan placement. If I put the fan blowing on the plate, the fridge would cool down rapidly as the cool air circulates, but the plate rapidly condenses moisture. Some would of course drain out of the fridge through the drain tube, but what remains on the plate evaporates back into the fridge raising the internal RH. I felt like the fan blowing on the plate helped to evaporate this condensation faster keeping the RH higher than it needed to be.
I experimented with the fan near the top of the space and that worked pretty well. The fan was blowing from the door back across the top of the fridge toward the back plate, and since it was located inside the channel intended for the can dispenser, it made a little air channel that pulled air from lower in the fridge, at least in part.
The RH swinging was the biggest question mark for me and the most likely source of failure. I ended up asking here on OG for help and got some pretty decent replies that matched what I was hoping wasn’t true. Too low of RH and the outer parts of the plant would dry too rapidly preventing proper movement of moisture from the inner portions of the plant thus preventing a proper dry. Too high of RH and the dry would take too long risking mold. High RH raises the dew point as well, meaning the chance of forming condensation on plant material would be increased.
Between now and next time, I’m going to try and improve the system with a few goals in mind:
-reduce RH swings
-increase total capacity of herb
-reduce fridge cycling (to improve lifespan)
I am toying with using more internal circulation to make sure the space is as homogenized as possible for temp/humidity. Moving away from hanging the plants to using wire/mesh racks would also be huge I think for circulation as well as overall capacity. As ridiculous as this sounds, somehow attaching a small windshield wiper to the evaporation plate would be a quick way to dump a lot of the internal moisture down the drain. I’m sure there’s a better way, but that’s the goal I’m keeping in mind, I just don’t know how to get there Removing moisture that way would be very helpful for reducing the fridge cycling as the dehumidifier generates a fair amount of heat which triggers the temp controller faster.
Alright, that’s about all I’ve got on the fridge for now. In the tent, I realized my dumbass had taken out the humidifier at some point (probably when it was a fucking jungle) and all the seedlings were a bit unhappy. I also had the lights a bit too strong (20 DLI for a baby radish is too much? Who knew??).
(Ignore the temp/RH - I had just moved the sensor from the fridge and it was still adjusting)
For this next round, I’m trying to be a lot better about managing VPD & DLI. I was so focused on the soil and nutrition last round that I think I dropped the ball in this department and shortchanged my grow (can’t even count the number of ways I fucked up last round ). From what I’ve been seeing under the scope, the soil is thriving and fungi numbers are continually rising. I’m seeing longer and longer hyphae and a shitload of fungal spores as well. I’m still planning to add the wine cap mulch layer but need these seedlings to grow a bit more and I need to finish adding the end of cycle dry amendments first.