Perlite turning yellow!? HELP!

[Hazemaster]

Hi guys,

I just took out my 4' florecents and put in a 400 watt MH. A good part of my mix is made from perlite and is now turning yellow on the surface.

Plants are 16" away from the bulb and it is NOT hot to the hand. Is the bulb to close to the plants? Don't want to burn them.

Oh, I transplanted the plants last night into 2 gal containers.

Is this normal for the perlite to change yellow? I think the lights are to close...I dono. Room is well vented and is around 80 degrees.

THANKS!

Hazemaster Reviewed by Hazemaster on 04-12-2007. Perlite turning yellow!? HELP! Hi guys, I just took out my 4' florecents and put in a 400 watt MH. A good part of my mix is made from perlite and is now turning yellow on the surface. Plants are 16" away from the bulb and it is NOT hot to the hand. Is the bulb to close to the plants? Don't want to burn them. Oh, I transplanted the plants last night into 2 gal containers. Is this normal for the perlite to change yellow? I think the lights are to close...I dono. Room is well vented and is around 80 degrees. Rating: 5

[VTDank]

usually if the perlite changes colors, its in a greenhouse under mist and its just algae, nothing to worry about in that situation, but I am stumped why it would be doing this indoors...I might have to get back to this one

[Hazemaster]

I was misting the seedlings with some distilled water, could that be why? Shall I no longer mist the plants? Thank you!!

[VTDank]

thats the only thing I can think of...the only situation I have EVER seen perlite change colors, and I'm a damn horticulture major...but if I think of anything else I'll let you know

[Hazemaster]

Shall I discontinue to mist? Again, thanks!

[AsianStoner420]

sum1 pissed on ur crop man,...

[Sk8orDie]

Same thing happens to me. After I water the plants, perlite looks nice and shiny white, but after a few days it looks a dull yellowish color until I water again. Plants don't seem to mind so I haven't thought anything of it. Oh ya, I add 2 tbps of h2o2/5 gallons, if that means anything to ya.

[Hazemaster]

Oh ya, I add 2 tbps of h2o2/5 gallons, if that means anything to ya.

Do you mix in the Hydrogen Peroxide with the other nutes or do you apply them at a different time??

[keeko]

theres no need to add h202 if your perilite is a lil yellow.....it shouldnt affect your plant.

[Bree1978]

^ IA. H2O2 is for algae. I've considered reasonings to this predicament recently because I got it too. I'm guessing it is soil dust/debris that has 'baked' onto the pearlite after watering.

:jointsmile: Bree