Grow Closet @ 100 Degrees F (Fire?)

I just set up a grow closet with 2 250 watt
cfl's. And I have a honeywell turbo desk fan which can be and was adjusted.

After about 8 hours we checked it out (we have a thermometer in there) and it was 100 degrees f with the fan on.

Do you think this is a problem? I have them on 24/7?
Once Again, Do you think this will start a fire? Thanks for all your expert help.

EDIT: 03-13-2009
The temperature is way under control now.
And the humidity is below 50%

See 14 pics of my closet and plant (now 32 days old) at:

HTML:

https://www.rollitup.org/members/bubblerman00-albums.html

Not sure about the fire...but from the very brief experience of growing I've had: I had 4 young seedlings, all of which died when the temp sat at 95+ for about 3 days. I read that the plants can die with temps over 90. So that might be a problem...maybe someone else will know.

when it's 100 outside does everything burst into flames?

yeah having your temps that high will for sure kill your plants. you need to have an exhaust intake and an out take.

try to at least get them into the 85 range.

2 things. Use less light - less plants. Do what you can manage. Another thing is bring in co2 . Plants can handle greater temps with co2. BUt seriously 250 real wattage cfl will veg 4-5 plants fine. Especially in a closet. Then for flowering bring both bulbs in and add an extra fan and get co2 and all should be sweet.

you should somehow make it cooler in there

the fan wont help, the fan is just going to blow the hot air around after a certain temp. threshold

The optimum growing range is 65-85degrees. 100degrees wont kill them but they wont grow very well. you need a exhaust fan to suck the hot air out of the room. Good Luck!

You need to install an exhaust in the closet. It's worth it so you can use all the light you have. You can't grow worth a darn in 90+ temps, it slows them down to a crawl.

If there's an attic above the closet just cut a hole in the ceiling, push the insulation out of the way and stick a fan in it. You can patch the hole when you move or whatever.

Bubblerman00 said:

I just set up a grow closet with 2 250 watt
cfl's. And I have a honeywell turbo desk fan which can be and was adjusted.

After about 8 hours we checked it out (we have a thermometer in there) and it was 100 degrees f with the fan on.

Do you think this is a problem? I espesially need to know because once it starts vegetative mode I will need to have them on 24/7 instead of 18 on and 6 off.

Once Again, Do you think this will start a fire? Thanks for all your expert help.

Click to expand...

100 degree C is boilling water temp , you'll need something around 425 degree C to start a fire.

Shit we have grown outside in arizona in the summer we see 115-120* F....only thing I can do is screen the plants its still 110* in the partial shape

Bubba Kushman said:

The optimum growing range is 65-85degrees. 100degrees wont kill them but they wont grow very well. you need a exhaust fan to suck the hot air out of the room. Good Luck!

Click to expand...

100 degrees may not kill them but depending on the humidity level at that high of a temp without a bunch of humidity you will increase the rate/amount of transpiration.

That means increased loss of moisture through the leaves which means increased uptake of moisture from the soil through the roots and that can mean an increase in nutes taken in and it can be at a rate that is faster than the growth of the plants will use it meaning you can create a nute burn problem without overfeeding.

If you have to run high heat you need high enough humidity levels to offset the otherwise increased rate of transpiration. At least that is what I have read and not what I have experienced since I have never grown in really high temperatures.

vapedg13 said:

Shit we have grown outside in arizona in the summer we see 115-120* F....only thing I can do is screen the plants its still 110* in the partial shape

Click to expand...

Well face it, herb is very versatile and depending on the strain it can grow in a very wide variety of climates and conditions and altitudes. The key of course it to find what the optimal conditions are for what you are growing and then attempt to create and maintain them or at least get as close to what are optimal conditions as you can and then maintain them the best you can. If you can do that you have a better yield and a better final product and fewer problems. If you can’t create optimal or near optimal conditions you do the best you can and then hope for the best.

To avoid nute burn or over fertilizing.......only use 1/2 of what the directions call for......if it says 1 0z per gallon of water use 1/2oz ......I use fertilizer everytime I water and never get nute burn....but then I transplant every 2 weeks too

vapedg13 said:

To avoid nute burn or over fertilizing.......only use 1/2 of what the directions call for......if it says 1 0z per gallon of water use 1/2oz ......I use fertilizer everytime I water and never get nute burn....but then I transplant every 2 weeks too

Click to expand...

Not to intentionally swerve the topic or anything and just to make a comment and not claim anything to be right or wrong but I always find it interesting how different some people do things and how well it can work in the various different ways. I guess that at least in part is evidence of how flexible or versatile or adaptable pot plants are.

I never repot. I start my plants out in the maximum size pot I will be using for a grow and never mess with them and just keep a log of feeding and what is fed in what amounts so I don’t end up killing them with kindness.

My family owns a nursery, trees and bushes and not plants and not as in taking care of kids, and one thing they learned is that once roots begin to circle a pot the plant becomes stressed and the roots are not as efficient, which I do guess is the reason for the stress, so they stopped most planting in small pots and will instead plant in larger pots and will maybe repot once or maybe never and things grow like crazy and seem to have fewer problems plus they save on labor because they do not have thousands of things to repot.

So I began doing the same with herb and it has worked great for me and there is less work for me to do right down to keeping up on watering since even when a plant is small and has shallow roots if the upper soil dries out much with there being a bunch of lower moist soil and the water will wick up and there is moisture for the shallow roots again.

It just goes to show that there is more than one way to skin a cat.

Yeah go into the room yourself and smoke it! LOL

no fire shouldnt be a risk,...but htat temp is way too hot to get successful grow with.also..isnt flowering stage suppost to use 12/12 light?

Brick Top said:

Not to intentionally swerve the topic or anything and just to make a comment and not claim anything to be right or wrong but I always find it interesting how different some people do things and how well it can work in the various different ways. I guess that at least in part is evidence of how flexible or versatile or adaptable pot plants are.

I never repot. I start my plants out in the maximum size pot I will be using for a grow and never mess with them and just keep a log of feeding and what is fed in what amounts so I don’t end up killing them with kindness.

My family owns a nursery, trees and bushes and not plants and not as in taking care of kids, and one thing they learned is that once roots begin to circle a pot the plant becomes stressed and the roots are not as efficient, which I do guess is the reason for the stress, so they stopped most planting in small pots and will instead plant in larger pots and will maybe repot once or maybe never and things grow like crazy and seem to have fewer problems plus they save on labor because they do not have thousands of things to repot.

So I began doing the same with herb and it has worked great for me and there is less work for me to do right down to keeping up on watering since even when a plant is small and has shallow roots if the upper soil dries out much with there being a bunch of lower moist soil and the water will wick up and there is moisture for the shallow roots again.

It just goes to show that there is more than one way to skin a cat.

Click to expand...

I took 2 germinated seeds and stuck them in 6 gallon plastic pots. After reading everyones kind responces I did the following:

1. There were (2) 250 watt cfl's - now theres only one.

2. There were (2) 6 gallon pots but they barely fit. I took one of the pots out also.

3. Now theres more room for the fan and I placed a medium sized bowl of ice cubes in front of the fan (the fan blows tword the bulb)

My temperature is now 86.5 F
I hear the hottest it should be is 85 F
Yet Ialso hear that it can adapt.
Is this temp better than over 100 F
like it was at first?