Yield from COB's

Safehaven

Active Member
I would be spraying down that room with peroxide and bleach to kill that pm. And break out the ever faithful eagle 20 on your clones and veg plants. Kill it now or it will haunt you.
I did spray bleach and peroxide. Hopefully I got it all. I since have also put a dehumidifier in the room.

Last time I let them grow like trees. This time I trained them horizontal.

We'll see, fingers crossed.
 

PerroVerde

Well-Known Member
@Safehaven what is the air exchange like in your room where you grow? What strain or cultivar types are you attempting to run? What are your lights out lights on temps in the area your plants are?
 

coreywebster

Well-Known Member
Lets all include our veg times when we are throwing up weights or its not useful info.
How long did you veg your plants for @Safehaven and how long @CoralMafia ?
Do you have plenty of fans moving air about Safehaven?
 
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Safehaven

Active Member
@Safehaven what is the air exchange like in your room where you grow? What strain or cultivar types are you attempting to run? What are your lights out lights on temps in the area your plants are?
I have a 6" 460 cfm fan pulling through a carbon filter. I'm guessing that I am netting about 400 cfm. The room is 468 cf, so I should be changing out air every 1.25 minutes or so.

Lights on, 80 degrees max ( I have since lowered this to 77 max)

Lights off, 70 degrees min (I lowered this to 65 degrees min)

I was able to salvage Amnesia and Galactic Jack. I had to destroy Ortega and Aurora.
 

PerroVerde

Well-Known Member
Also for powdery mildew a mix of water and 15-20% milk will knock that down without harming the plants.

Make sure your still exchanging air after lights off because plant are still transpiring and humidity levels can spike big time.

For ease of growing try a couple of 12" to 14 inch tall clones of your favorite girl during your next run. You may be surprised how ease plants that size are to work with and how well they yield... :)
 

Safehaven

Active Member
Lets all include our veg times when we are throwing up weights or its not useful info.
How long did you veg your plants for @Safehaven and how long @CoralMafia ?
Do you have plenty of fans moving air about Safehaven?
My veg was long. 3-4 months. I hadn't built my flower lights yet, so they sat under the veg lights for a while.

I was thinking that perhaps I do not have enough fan circulating. I have one 16" fan circulating on the plants.
 

coreywebster

Well-Known Member
My veg was long. 3-4 months. I hadn't built my flower lights yet, so they sat under the veg lights for a while.

I was thinking that perhaps I do not have enough fan circulating. I have one 16" fan circulating on the plants.
Wow that's super long for that sort of yield, I get 3.5-4oz per plant under a 600w hps with 4 weeks veg, I only put 4 under it and only use 3/4 of the space so could bump another 3.5-4oz from the same area if used to it potential.
Yeah you have air movement but I would add another fan too because it cant hurt. I don't know your grow space dimensions, what area are you working with and although you said your extraction rate is there plenty of passive intake air?
 

sixstring2112

Well-Known Member
Try keeping your day and night temps closer like 75f to 78f all the time and humidity the same like 40.to 50% this along with good airflow will help solve the pm problem.if you really want to prevent it from coming back you should do a sulfur burn in there when its empty and maybe do a burn on the vegging plants just before they go to flower.
 

Safehaven

Active Member
Wow that's super long for that sort of yield, I get 3.5-4oz per plant under a 600w hps with 4 weeks veg, I only put 4 under it and only use 3/4 of the space so could bump another 3.5-4oz from the same area if used to it potential.
Yeah you have air movement but I would add another fan too because it cant hurt. I don't know your grow space dimensions, what area are you working with and although you said your extraction rate is there plenty of passive intake air?
Yeah, I think I was making every mistake in the book. Wrong nutes. Over fertilizing. Let them grow like trees, 50-60% RH during flowering. 80-82 degrees during flower. Didn't quarantine new plants during veg to they got a manageable infestation of spider mites.

It was a great "what not to do"

The only mistake I probably didn't make was overwatering. I was real conscious of this since I read it is the number one mistake.
 

coreywebster

Well-Known Member
Do you think you could of had root bound plants? That's a hell of a lot of veg time. What pot size were the girls in?
 

Safehaven

Active Member
Do you think you could of had root bound plants? That's a hell of a lot of veg time. What pot size were the girls in?
Very possible! They were root bound when I repotted to the fabric 7 gal pots they finished in. I did not check once I harvested to see if they were root bound. I was told that the roots would go through those pots and they did not, but I still think they were probably bound.

Yet another mistake ;)
 

coreywebster

Well-Known Member
Well you learn more from a few mistakes than from years of growing with none and been lucky! Lets hope your next run goes a lot better for you. My background has been in HPS but I know these Cobs should kick the shit out of any standard hps fixture.
Hopefully a clean run will see you pulling the numbers you should be.:leaf:
 

researching

Well-Known Member
Most first grows are what not to do and the beginning of refinement. At least you know your lighting is not the problem.

If you arent using, I highly recommend root pouches, geo pots, or air pots for containers. No root bound plants and no need to use big pots. Although it can be a watering nightmare if you have a tree in a 2 gallon pot. Unless you go automated.
 

sixstring2112

Well-Known Member
If you feed them right rootbound is a non factor in yields imo.i veg super long and my finishdd plants are almost always rootbound.just keep at it.pm is easy to combat once you know what not to do.crowded plants with little air movement and big temp swings are the best places for pm to bloom in.
 

Hybridway

Well-Known Member
I just finished my first grow ever (under any lighting). I think I experience just about every issue one can encounter and made just about every mistake as well. Needless to say, my yield was disappointing to say the least. I only got 2 oz off from one plant and 2.5 oz off another. I had to destroy the other two plants that I had growing due to powdery mildew issues.

So, I am curious to hear what others (with more experience than me) are yielding from each of their girls under COB lighting.

Here is my setup. (24) 3590's, 3500K, running at 49W ea., space 1'3" apart.

View attachment 3773987 View attachment 3773988
You'll need reflectors or lenses to be effective. Or drop that sucker right down to 8"-10".
 
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