Humidity issue

My humidity in my room under the lights is at 23% with temps between 75-83 degrees. I'm having a problem with powdery mildew spreading and I was of the understanding that the airborne fungus doesn't spread in high humidity...any advice?

The room is well ventilated by the way.

your ass backwards with that.. powder mildew doesnt like low humidity..

sorry thats wut i meant...really baked probably...well they don't like low humidity and thats what i have. i'm gonna see what the humidity is at when the lights are off...that may be the problem

Get a dehumidifier and sulfur burner. Just don't leave the burner near the plants.

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Tlsdrm do you have ventilation up through the canopy?

Is the floor of your room wet from water dripping through your buckets?

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- Take all of your plants from your room.
- Clean with a mild bleach solution, rinse the walls.
- Make sure that your room is completely dry, floor walls ceiling.
- Build an Air Floor (download Weed Science: Equipment) with air inlet below floor, outlet near ceiling.
- Draw air through the canopy to eliminate mold.

It could be stagnant air below the canopy, not the humidity, that's causing you problems. A fan pushing air between the light and the canopy to reduce heat stress will not solve the problem - you need to vent the rooms air and draw fresh CO2 rich air up through the canopy. An air inlet on one side of a grow room often cause and air flow up the wall and across the tops of the plants, not up through the canopy - especially if the canopy is thick in flower.

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Milk Crates make a great air floor - remember the golden rule: Be lazy, the work is already done for us and someones thrown it out.



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Do you have a fan circulating air at all times? And not just during light hours, at night is the most important. Cool, stagnant air will murder you.

your problem is probably coming when your lights are off. But you also need to maintain above 40% when your lights are on plants dont do well under 40% and mildew loves it above 50% Asulfer burner work great if you dont want to use a sulfer based spray Safer make a real good fungacide spray. Haveing air moving through your canopy is some really good advice also.

ive got a fan oscilating on them at all times. sulfur burner is out of the question because of smell. i just checked my night time humidity and its at 42%...almost double what it is when the lights are on...i'm goin to look up humidifiers and see if i can afford one and i'm also going to get another fan to put lower to the ground that's gonna push air through the canopy towards the walls and that air will move up because of the OTHER fan and into the filter...i was thinkin bout some co2 but it would be pointless as my vent fan is on 24/7

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"i was thinkin bout some co2 but it would be pointless as my vent fan is on 24/7"

I meant exhausting your grow room air so CO2 rich air from your living area feeds through a passive inlet into your grow room. Air in your house can have up to 2x the CO2 percentage as air from outdoors.

You could put your filter outside of your grow room or build a air flow redirection bucket - duct tape plastic to the top of a bucket bigger than your air filter.



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hey man i got my humidifier for $15 at walmart, great investment

tlsdrm73 said:

ive got a fan oscilating on them at all times. sulfur burner is out of the question because of smell. i just checked my night time humidity and its at 42%...almost double what it is when the lights are on...i'm goin to look up humidifiers and see if i can afford one and i'm also going to get another fan to put lower to the ground that's gonna push air through the canopy towards the walls and that air will move up because of the OTHER fan and into the filter...i was thinkin bout some co2 but it would be pointless as my vent fan is on 24/7

Click to expand...

It doesn't sound like you should be having problems. That's wierd.

so i should get a humidifier to have on durng lights on?

try some moisture absorbing crystals, from a hardware store. I would not put something that adds moisture to a space with a very hot light in it.

Maintaining a proper humidity range is not only important to keep mold from growing but also for maximum resin production. Humidity plays a key role in plant resin production. While some potent equatorial strains do occur in high humidity areas, most high-test landraces have evolved in drier areas, like Afghanistan. The aridity of the areas of Afghanistan where Indica strains have evolved is quite apparent by the trait of large dense flower clusters. This would only be an advantage in an area of low humidity, as flowers will mold in anything more.


There are many examples of non-cannabis plants producing resins in order to protect themselves from drying out. The waxy coating on cacti and other succulent plants is a prime example. Marijuana flowered in humid conditions will often have a longer stalk on the glandular trichome than the same strain grown in drier conditions. While this may give the appearance of being very crystallized, it will likely contain less THC than the same plant grown in a drier environment. Another problem with longer trichome stalks is that the gland heads are more likely to break off during handling.

so should i or should i not add a humidifier to the room...just somethin small? and only for when the lights are on? cuz my humidity is gettin as low as 23 day hours...

haha lot of different suggestions huh..

it wont hurt to get a digitol controled humidifier..
in veg set for 55 i think that is the highest setting..
in early flower set for 45
and the last few weeks turn it off.. and you will get way more crystals