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I'm looking for assistance in identifying this leaf mold. It has the appearance of a trichome and persists only under the cloning dome of fresh cuttings or in dead leafy matter accumulating under the plants. Any help in naming this culprit would be greatly appreciated.

Is it true that you'll get 30% more light from a good electronic ballast vs a magnetic? I have a magnetic ballast and the best I've gotten with it is .91gpw. I probably could break 1gpw but the plant needed some more support. If I upgrade, what kind of performance increase could I see?

1K per m^2, anyone done it? The reason I ask is because I believe it's what's really required if you're going to increase CO2 and run high temps. I mean I've heard 2000umol/s/m^2 at 1200ppm CO2 and I think 1500umol/s/m^2 at 800ppm CO2 as optimum for cannabis growth from a few different...

So the laws of thermodynamics state basically that in order for a system to become more ordered relative to the universe it must give off heat. Entropy and enthalpy, respectively. All lights give off SOME heat. All electronics, really. So what if we could design a light that when electricity...

Did a quick search and haven't been able to find anything quite like this setup. Can someone tell me if they've done this and if they can paste the code here it would be great! Objective: Automatically water plants based on moisture need during lights on period, replacing the need to fiddle...

What have you all used to insulate your hoods? Reflectix looks like the easiest to use non permanent solution but it has no rated R value. If someone has used reflectix can you give me: A) Room temp B) uninsulated hood temp C) insulated hood temp The reason I ask is there is another...

So suppose a drip system were used with 4x4x4" rockwool and they were flipped as soon as they were transplanted from clone for a 9 week flowering strain, is that enough media or would it be necessary to put say a coco mat under?

I'd say another week or two, more? thoughts?

How do they look? GG #4 in the front, Bubba Kush in the back.

OK, so this whole FP is really starting to confuse me in regards to nutrient ratios and horticulture knowledge. @Uncle Ben recommends it highly, but I believe he mostly grows in dirt which may contain some nutrients of its own made more available by the bacteria in the rhizosphere. @homebrewer...

So I have a few strains I'd like to grow out and try breeding together combinations of in order to create a more Apollo 11 genius type strain. I want to get a strain that's fast finishing (at least 6-8 weeks), large yielding, very heady sativa high that is super social yet introspective and...

Anyone use it? Can't get it to work personally. I mean, it works - but the pH and EC are so far off what they should be it's nuts. I think I may try running a grounding wire from the sample pot to the ground to see if the moving water is causing a static buildup in the sample pot and...

Rockwool, was pH'd proper - runoff matches the pH of the nutrient solution. temps: 80, co2: 1200ppm, ~50watts of LED per sqft, Iron deficiency, sulfur deficiency, or zinc deficiency?

@diamonddav in particular. Had a schrader valve leak when I let the charge go. It's been operating well enough except when I bring in an extra light or two and then my indoor coil freezes up. I'd bet my horse that it's a low charge from when I lost some refrigerant when first setting the...

Ok so according to MBferts 5mL of silica blast per gallon results in a 30-35ppm solution of silica (plus potassium). You can purchase Agsil 16H through them or other retailers. It is 24.64% silica and 26.89% potassium. So how do we make our own gallon of silica blast? Get a gallon jug and...

So I was looking for some input on this idea. There's not a ton of information on rockwool drip let alone drip to waste that I've found. I have a 6x12' table with a 2 degree slope to drain made of wood but lined with pond liner. There are some small areas of puddling which may or may not be...

I was wondering before I tried this out if anyone has tried 4" rockwool blocks on top of a .25" coco mat where they just kept the mat wet. Would the rockwool wick enough from the coco mat? I ask because it'd take 50 gallons of water to go to 1" depth in my tray and I'm not keen on getting a...

I need some input on a redesign idea. I tried using HP aero (albeit longer mist times) and I've lost two crops to root rot. My first idea was to switch to a system like my mothers where they're in a tray filled with an aquavalve and sitting in pots filled with perlite in holes cut out in foam...

I know you're not supposed to double post, forgive me mods. Here's a link to some issues I'm having, any input here or in my thread would be great! http://rollitup.org/t/about-a-pound-uncharted-hpa-territory.863801/page-4#post-11645110

You know who you are. You may have innoculated, you may have not, you may have been slimed or had root rot in the past but beat it with bacteria. You're the kind of person who leaves a cloner running for months and doesn't even change out the water. Why don't you share that water? Reason...