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 …


  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. 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%?

Leave a Reply