Ignignokt
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This is actually incorrect. Turns out the humidity is not a 'trigger' to grow more trichomes, I'm really growing less plant under the same number of trichomes.The "VPD" information everyone is using says I flower in 18+.
Like SpiderK says "Trichomes (hairs) - create a more humid microenvironment to reduce evaporative water loss"
What trigger causes more trichomes to be produced, by trichome bearing plants? Low humidity.
What I do get is what other growers who've done the same agree on. I get higher terpene production and retention. Since you're growing less plant, you have to veg longer than you would in a super-high VPD environment as you're not going to get that massive explosion of growth during stretch.I flower with a canopy temp of 72F max (cannabis will try to cool itself using transpiration in higher temps), and a relative humidity between 20-25%, I prefer 20%. This low temp, low humidity sets up some rather high transpiration rates, making for much lower nutrient strengths being necessary. Yes, I grow hydro, no 'lack of moisture' in my soil. :)
What do I get? Massive trichome density and outrageous terpene/cannabinoid expression. Every time I hear a grower complain about how hot it is in their flower room I cringe. When I sample their cannabis I just shake my head sadly. So much effort, for such a lower quality product.
Douglas
Im following these guidelines I read somewhere along the way, maybe royal queen seeds page? SEEDLINGS CUTTINGSThe rosenthal book is a good starting point, IMO, but 50% isn't doing you any favors. My best rounds have been when rh was 70%, temps around 80 and then the temp and rh tapered back to low to mid 70s and 50% by the end.
Can you all make some recommendations on ideal humidity and temperatures? I read one of Ed Rosenthal's books, and if IIRC, he recommends temps for flowering plants of 75-80deg, with humidity around 50%.
I just completed my first indoor organic soil grow, and the leaves on my plants all started looking pretty sad when they got near full ripeness. Really, they never looked 100% happy. They have always had a reverse-canoe effect going on - edges curling down with end tips showing slight burning, and also claw effects. I figured it was Nitrogen excess.
Just last night, I had an "ah-ha!" moment when I realized that the fan I had blowing on my canopy was fixed (not oscillating), and may have been drying the leaves. Now I know that it may have been dramatically increasing transpiration. I live in a very dry climate. I've been running the house fan 24/7 to keep the room from getting too humid, and now I'm wondering if it's been too dry. RH stays around 50%. Dark cycle temps for grow room were dropping in to the low 60's, because it I run the dark cycle from 8:00am - 9:00pm, and I run A/C in the house during day. Makes basement cold.
Great thread! Thank you!
First time I have read this and yeah this is an amazing breakdown of not only VPD but complete information of other contributing factors that affect respiration.
I made a vpd thread a couple weeks ago explaining it in very basic terms and giving guidelines to the ideal VPD for different stages of growth no where near as complete as this. What I found interesting was that VPD is not as beneficial to growers using wet/dry cycles as it is to hydro and soiless. I had not really considered this before even though I have the understanding and it makes perfect sense.yes I have never thought of deficiencies in that way before! I always assumed defs were because of user error with the nutes without a second thought of VPD and transpiration but when you think about it, it all makes sense! Lightbulb moment for me.
I made a vpd thread a couple weeks ago explaining it in very basic terms and giving guidelines to the ideal VPD for different stages of growth no where near as complete as this. What I found interesting was that VPD is not as beneficial to growers using wet/dry cycles as it is to hydro and soiless. I had not really considered this before even though I have the understanding and it makes perfect sense.
A burner? Have a diary that I can peek at maybe I can spot somethingYou know aqua ive been struggling with various problems this grow, most of it turned out to be my co2 generator, thing is I changed it to vented and switched off the co2 and its better but now way too cool and humid, striking a happy medium seems hard, not really sure if the generator is causing a stomata closed situation. Its a proper dilemma tbh.
A burner? Have a diary that I can peek at maybe I can spot something
Propane?Diy watercooled burner, ill start a diary first thing and post a few pics something seems a miss in my groom though, ive never managed to make my groom work as well as the tents!
A burner? Have a diary that I can peek at maybe I can spot something
My guess is ethylene... You need a very efficient method of burning. The CO2 burners sold are built for that purpose.When its on, they stop drinking and within 2 days start showing cal-mag def or P def and when its off they are ok but then its unsealed and too cold
Propane?
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