Humidity levels, How low is too low?

From what i was told since i too have a low humidity during flowering is that its not a problem. The High humidty is bad because it can increase the chance of mold and other bad things. i was told that lower humidity might make you have to water plants more often and some other things but its nothing to worry about i dont think.

i have heard that lower humidity during flowering is good and promotes plants to produce more resin to protect plant from drying out

Originally Posted by hansolo33

Wat if the humidity is around 20 - 30% during flower stages?

that's right were you want it, too low haven't heard of that ever being a problem but it's cheap to raise compared to lowering it with a dehumidifier.

I have a dehumidifier in my grow room and I set it to 35% when flowering and my plants seem to love it.

I actually have to empty my resevoir everyday and it holds 2 gallons! I have also heard that the low humidity will promote more resin in the buds. I think you will be fine

I agree. The lower the humidity, the more water loss the plants experience. A tricome is far more efficient at water retention than open leaf. The plant responds to dryness by producing more trichomes (and more resin) to "seal" up the plant. It is clear to allow light thru while keeping moisture in. Pretty smart of the plant, but even smarter is the gorwer who uses this to their advantage!

In veg, 60-70% is desired as it aids in stomata opening (the skin of plant material, the more open, the more photsynthesis). In flower, lower as much as you can. I do not believe you can get too low. 35% is the lowest setting on a lot of units, and this is below the min recommended of 40-45%.

It makes a huge difference.

Think about it this way. Humidity is like the economy. When living costs more money, we tend to try to conserve as much money as we can. Likewise the plant conserves as much water as it can. The drier you get it, the better the result.

Take a look at this girl 3 1/2 weeks in 12/12, veg was 70% RH, 35% RH in flower. You will rarely see furry-ness of this nature so early or so intense without low RH. Worthy to note, even the larger leaves surrounding these flowers are loaded up with tris.

Originally Posted by passerbye

I agree. The lower the humidity, the more water loss the plants experience. A tricome is far more efficient at water retention than open leaf. The plant responds to dryness by producing more trichomes (and more resin) to "seal" up the plant. It is clear to allow light thru while keeping moisture in. Pretty smart of the plant, but even smarter is the gorwer who uses this to their advantage!

In veg, 60-70% is desired as it aids in stomata opening (the skin of plant material, the more open, the more photsynthesis). In flower, lower as much as you can. I do not believe you can get too low. 35% is the lowest setting on a lot of units, and this is below the min recommended of 40-45%.

It makes a huge difference.

Think about it this way. Humidity is like the economy. When living costs more money, we tend to try to conserve as much money as we can. Likewise the plant conserves as much water as it can. The drier you get it, the better the result.

Take a look at this girl 3 1/2 weeks in 12/12, veg was 70% RH, 35% RH in flower. You will rarely see furry-ness of this nature so early or so intense without low RH. Worthy to note, even the larger leaves surrounding these flowers are loaded up with tris.

looks tasty.
What's the strain if you don't mind me asking?

i always thought 50-60% humidity during flower was ok until the final 2 weeks when you want to get it down as low as possible?

are you guys keeping humidity to about 35% for the whole flowering period?

when the plant doesn't have many roots I like to keep the humidity as high as possible- around 90%. Of course it still needs some air flow so 100% isn't really practical.
That way the plant can feed off the leaves.

Then when the plant have some root system I lower the humidity to around 50-60% in veg as the plant still wouldn't mind some feeding from the leaves.

In flowering they should already have enough roots to take enough nutrients from the soil alone. Buds don't like humidity - it promotes loads of problems.
But humidity of 5-10% isn't that good either - the plants will be weaker as they can barely absorb anything from the leaves, the medium will dry out really quick and so on.

If you live in somewhere that you can get 5-10% in your grow room I advise you to get it up to at least 20%. Thats pretty easy to do - just lower the venting a bit or add a bucket of water to your grow room.