Getting Humidity

Hey guys, im having trouble getting humidity into my growroom... It is only a fairly small growroom 36inches W x 18inches D x 28inches H. I am running a 250watt MH light 23inches from plants and have a 15cm computer fan blowing air in another as exhaust and a 15cm desktop fan from BigW. I can get day temps. of around 28 celcius but my humidity barely goes over 10% Im in trouble. How do i go about getting more humidity into my grow room without adding more heat? (I have used a heat mat under a water container for reptiles humidity but I would like to try it without the extra heating)

Any tips, questions and comments welcome and thanked in advance.

Cheers kwaka

Your "room" sounds pretty small, but I've gotta wonder if there's a way to rig up a cool humidifier so it blows the water mist in. That, or try one of those florist's Oasis blocks, wetted down pretty well. Or maybe rockwool wetted down (I have no idea how well rockwool dissipates moisture).

OR! The 1970s plant-grower thing my folks did. Tray filled with pebbles, plants set on pebbles, water added so it's JUST below the pots (so they don't get over-watered). Make sense?

Edit: But, do you really need to get humidity up? How are your plants growing and responding to current conditions? I am a big advocate of "If it ain't broke, don't fix it!"

Same here my humidity never gets above like 25% in my 2x2x4 area. Even with my humidifier in there it only gets to like 30%. Is it cause it is a warm mist one so it just raises to fast?

Bump, Please guys i need some help here......

I have and will have the same humidity problems. Indoor forced air duct heating will dry a house out super fast.

Also, fall and winter months are more dry.

Best thing to do if you're heating is the problem. Heat it with something else like radiant heat. That doesn't dry out a room so fast. Running two humidifiers, cool and warm mist get me to about 30% as well. Heating with radiant heat will get me up to 40.

I also stop exhausting the room in the cool months. Humidity and heat go way up but that's welcomed in the fall and winter. Or just don't exhaust as much.

I supplement with C02 when I don't exhaust for obvious reasons. I use the DIY 2L bottle method (that can be found on this forum). The bottles also help build humidity.

All that gets me up to a steady 50% which some will say is not enough for the vegging stage. I can spike it up to the 60s with heavy and frequent misting. I alternate with carbonated water to further sumplement with CO2.

Seamaiden said:

Your "room" sounds pretty small, but I've gotta wonder if there's a way to rig up a cool humidifier so it blows the water mist in. That, or try one of those florist's Oasis blocks, wetted down pretty well. Or maybe rockwool wetted down (I have no idea how well rockwool dissipates moisture).

OR! The 1970s plant-grower thing my folks did. Tray filled with pebbles, plants set on pebbles, water added so it's JUST below the pots (so they don't get over-watered). Make sense?

Edit: But, do you really need to get humidity up? How are your plants growing and responding to current conditions? I am a big advocate of "If it ain't broke, don't fix it!"

Click to expand...

I like the pebble idea. I thought of lining the floor of my room with pea gravel. I think I'll look into that.

I also do believe in you're idea of if it aint broke. Only time I really worried about humidity was when I was growing a sativa strain. The leaves started to "canoe". The indica strains don't bitch as much.

wow thanks for all the replies. The plants are starting to go a soft, bruised feel. I am getting some growth but any that occours is somewhat unusuall Like twisted and deformed. with having said that they are still looking green with no unusuall spots or drying out. Maybe my problem here could be a nutrient/watering problem or a genetic thing? Ill keep the plants going at the low humidity and see how they form if they worsen Ill Keep them in there untill the problem gets rectified ready for my next grow.

I live in the Sierra Nevada, and I know my relative humidity is low most of the time (my skin, lips and inside of my nose are always keeping track). Heat has presented a far more difficult problem to overcome, and far more damaging. It will present with reduced growth, odd growth, skinny leaves, twisted leaves, drying up of leaves and other symptoms that appear to be nutrient burn or lock-out.

That being said, my only indoor "grow" is comprised of clones in a closet downstairs with a 4' double-light fluoro fixture. Humidity and heat are not an issue, sufficient light for those that are exploding on me is.

acea74 said:

I like the pebble idea. I thought of lining the floor of my room with pea gravel. I think I'll look into that.

I also do believe in you're idea of if it aint broke. Only time I really worried about humidity was when I was growing a sativa strain. The leaves started to "canoe". The indica strains don't bitch as much.

Click to expand...

Now that right there, that's something the plant's "telling" you, "Hey, I'm not happy and may not grow so well." That's the sort of thing that would spur me to make changes, not a reading on an instrument. This is because I've killed plenty of fish and other living things trying to make environmental parameters match what I'd read they should be, instead of letting the organism tell me how it feels.

The cheapest and quickest way to improve the situation is to keep a bucket of water in the room with a small fan blowing across the top of it. However, 10% rel. humidity is quite low and your best bet may be to add a simple table-top humidifier.

rolla8 said:

The cheapest and quickest way to improve the situation is to keep a bucket of water in the room with a small fan blowing across the top of it. However, 10% rel. humidity is quite low and your best bet may be to add a simple table-top humidifier.

Click to expand...

Didja read the dimensions of his "room", though? I don't think even a table-top unit would fit in there (and that was one of my suggestions).