Hola all!

So, I've recently (over the weekend) been able to increase the humidity in my Phrag growing area to 50-60% humidity. This is a small space, and I can close it off. I've been playing around w/ it, and with the door open, it is on the lower end. Higher (around 55-57%) if the door is closed. But yesterday I watered so I turned on the fan which lowered it. Today, fan off, door closed. All seems fine. My question is what should I do at night? Run fan and humidifier and close door? Open door and run humidifier? I don't want it too moist. So, I'm perplexed!

Thanks for any help you can lend!

I live in florida with a pretty good relative humidity. I have cool mist humidifier in my grow room that is 24"x72", its pretty small, and I'm able to boost humididty by at least 20-35% with just the humidifier some cheap thing I bought at Wal-Mart. Ikeep door closed all night and open it in the morning for about an hour to get some fresh air in there. Mostly just seedlings in the grow room though!!! So far so good!

I would close the door and check in the morning what the humidity went up to. Do you have a hi-lo humdity gauge? I find in my room at night that the humidity goes high. I have fans running and a dehumidifer so it does not get to humid.
Up here in the cold north of Can.

Hi Paphgirl,

In general, I think the best thing to do is run the fans at night with the door open, and let the humidity drop. As the temperatures fall at night the humidity should increase anyway, so humidity shouldn't be a problem. It's important to avoid a situation where the temperatures are low, the humidity is high, and there is no air movement. This is especially important if you've watered later in the day and leaves are not yet dry.

Hi Paphgirl,

In general, I think the best thing to do is run the fans at night with the door open, and let the humidity drop. As the temperatures fall at night the humidity should increase anyway, so humidity shouldn't be a problem. It's important to avoid a situation where the temperatures are low, the humidity is high, and there is no air movement. This is especially important if you've watered later in the day and leaves are not yet dry.

Okay Tom, thanks (thanks to all, but) those are the lines I was thinking along as well because it is a smaller space, I was a little worried about too much moisture/too little air movement at night.

Heather, as you know, I grow in my basement. My grow room is only 8' x 8'. I have one of those old fashioned wheel type humidifiers in the room and it's set to 60% which means that it only comes on periodically. I have a fan on....two actually (one blowing over the benches and one to move the air under them) that are on 24 hours a day. The door to the room is shut all the time. I have a dehumidifier outside the room to take care of any humidity buildup that may occur in the other part of the basement. Our furnace also has a dehumidifier built in. (I use that water to run the humidifier. :roll: ) So far everything has worked out well for me. Hope that helps a bit.

My humidity is set at about 70% all the time (day and night). Box fans for airflow run 24hrs non-stop.

The humidity is produced from ultrafine misters that spray in non plant areas of the greenhouse.

For long streches of cool cloudy days, when the high temps may not exceed 70, I will reset the humidity setpoint to 60%.

I generally do not mist plants directly in the evenings.