Grow Room Humidity (RH) and Temperature For Indoor Cannabis Plants



One of the most important elements of a successful Cannabis grow is air…specifically, the grow room temperature and relative humidity (RH). In this video, Rob …

41 Comments

  1. just started seeing a bit of powdery mildew can you give me the best dial back to get rid of that asap… i am using a really good garlicy spray that seem to make it better — it goes away and then kind of comes back

  2. This is what I have extrapolated from grow videos: Let me know what anyone thinks, Thnx.
    Auto Flower:
    Early Veg (~62% Hum) 78 degrees

    Late veg, ~52% Hum) 78 degrees

    Early Flower (~42% Hum) 75 degrees

    Late Flower (~32% Hum) 72 degrees

  3. What about day and night temperature differences? I have heard it makes stems thicker and yields bigger? Should there be a 5 degree celsius difference, or is it a waste of energy to cool down?

  4. Looking For some help please…

    I have two plants in veg (3 weeks old) in a 3x3x6 tent with only an exhaust fan (190 cfl). Multiple floor fans, dehumidifier. LED lights (600watts) Weather in this area jumps around. Some days really humid, others really dry. I'm really worried about when they are put into flower. Usually the humidity stays within 50-68%, but lately it's been very humid outside, and my tent won't get any lower than 70%…. any suggestions on how to help the humidity stay at a solid 50-55%?

  5. Put my plant in the tent today humidity was 99 % 4 week old hated it straight away wilted it is now on 55% think it likes it better will have to see if she perks up it is on 25 degrees in here rn with the LED

  6. Please can you do a proper explanation. Temp and humidity from germination to seedling to early veg to late veg to early flower to later flower. Also what do you mean by gradually reduce temp and humidity?

  7. Yo mate I got humidity issues I got a 1.2 by 1.2 tent with 6 girls inside humidity around 70% all the time .. any dehumidifier you can suggest from ๐Ÿ‡ฌ๐Ÿ‡ง

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