Cannabis Knowledgebase

ICMag links:


An often missed forum that answers a lot of tech questions about the site.
Website Support forum

You cannot change the past, you can only change the future. Be prepared.
Security and Legal Issues forum

Either the Infirmary Forum or the following link should have been one of the first pages in the first three visits you made here at IC…and certainly both within the first five visits!

A library in it’s own right!
“The Most Influential ICMag Threads… lets see them,” by LiLWaynE

Apart from what keeps any one of us here, ultimately, this is what brought every one of us here.
“THC 1o1 thread from og,” by LowGrow

Scientific confirmation of what more experienced growers have known all-along. This one should be required reading!
“This is a gold mine of cannabis growing Laboratory research,” by LJB

Not to be confused with the “R.U.S.T. GROW” thread by Motaco. This one is a taxonomic walk through Sativadom. Well written and as insightful a read as you will find.
“Revival of the Ultimate Sativa Thread,” by Motaco

The man knows his bidness!
“Understanding Inorganic Salts and Their Relationship to Plant Nutrition,” by Grat3fulh3ad

An outstanding reference on Dx’ing problems and potential problems.
“Plant Nutritiion and Visual Diagnosis,” by Gr3atfulh3ad recommended by Cozy Amnesia

I have yet to see any of these, but I would trust Core’s good judgement.
“Great Cannabis Video Links…FYI,” by Core

The first of many helpful threads.
“Basic Lighting Terminology and Definitions,” by I.M. Boggled

Similarities, differences, and how they are used.
“Lumens and Lux and PAR, Oh My!,” presented by PreacherManZero

An essay not to be seen as, “Why?” But, rather, “Why not?”
“The Truth on Flouro Vs HID,” by Thundurkle

If plant count is not a concern, but, maximum yield in a small space is…have a read!
“DrBud for Dummy’s,” by eLiguL

Everything has to start somewhere.
“Basic Lighting Terminology and Definitions,” by I.M. Boggled

HID users have nothing on these guys!
“CFL Club!” by CFL…King

“PLL Club. (if you don’t know, now you know),” by Melkor420

A reference for the rest of us.
“PC Case Growers Club,” by Rkrone

This one is a bit too obvious for a pun!
“ICMAGS Minifridge Clubhouse,” by Disfunktional

The venerable Mills Pride club at OG, revived here. A long thread, but a wealth of info on “controlled environment” enclosures. Props to Sumo for starting, and all those contributing to, this thread.
“The Mills Pride Club” by Sumo

Practical guides to what each wattage can and cannot do.
“70w HPS Club,” by Mk3Jetta
“150w HPS and Resource Guide” by Pipedream
“250W HPS Users,” by creeptic recommended by Freezerboy
“400W Club,” recommended by Freezerboy
“Ceramic Metal Halide (CMH),” by MPL and recomended by Freezerboy
“IC 600W Club,” recommended by Freezerboy….ight=600w+club
“IC 1000W Phone Booth Club,” by Bambam….highlight=club

Novice to Intermediate:

For those who don’t want to take the time to know, good luck on your journey. But, for those who have their wits about them, these will give you back more than the time spent reading them. (A special thanks to I.M. Boggled, because he gives a damn about people he has never met, and likely never will!)
“Basic Princples of Electricity,” by I.M. Boggled
“Electrical Safety for Indoor Grows,” by I.M. Boggled
“Smoke Alarms…Detectors (fyi),” by I.M. Boggled
“Extension Cord Safety (fyi),” by I.M. Boggled
“Fire Extinguisher: 101 (fyi),” by I.M. Boggled

As good a grounding in the basics as it gets. Thanks Kodiak!
“A Cannabis Growing Guide – What I have learned during my five years of growing weed,” by Kodiak

Don’t let the title fool you, the first half of this OP is about as informative a guide as I have seen…anywhere! Thanks to DHarvester for shining a light on this.
“Starting a Medical Cabinet and Bubbler Principles
 (by Lucas),” by DHarvester

A wealth of info on just about anything cannabis…and then some!
“Wanna Ask The Old Farts A Question?,” by HempKat

Don’t let the title fool you, the first half of this OP is about as informative a guide as I have seen…anywhere! Thanks to DHarvester for shining a light on this.
“Starting a Medical Cabinet and Bubbler Principles
 (by Lucas),” by DHarvester

Know your enemy!
“Introduction to Mites,” by I.M. Boggled

Insight into what you need to consider.
“Striders Guide to Micro-Level Cannabis Cultivation SE,” by Strider

Be honest, how many of us give this little more than a passing thought?
“Painting the Growroom.” by clampie

I think too few people realize that it is not as much about air movement as much as it is about the transfer of heat. The amount of air flow is just part of the equation. An excellent guide to one of the most troublesome aspects of growing.
“Ventilation 101,” by redgreenry

Yeah! Broken down in terms even I can understand.
“Understanding Air Flow,” by Hoosierdaddy

Is it getting to the point where driving miles to fight traffic and crowds of people just so you can haul jugs of RO water up multiple flights of stairs for a small grow, is becoming more of a chore than a labor of love?
“DIY Reverse Osmosis,” by Pipedream

The journey of 1000 miles, begins with a single step.
“Germination…What Methods do You Use?” by SteppinRazor

Plant count be damned! As far as I am concerned, the best tutorial on anything I have seen outside a text book and even better than most of those.
“Hempy’s Perpetual Harvest in 90 Days,” by HappyHemphog

Simple to use and easy to maintain! As good an introduction to hydro for beginners as it gets!
“The Official Hempy Bucket Thread,” by Southern Seeds

A solid foundation for understanding what each technique is and when and how to use.
“A Complete Guide to Topping, Training, and Pruning,” by Kodiak

For those who need to learn it before they can do it…
“Understanding the Art of LST,” by Quazi

…and for those who need to do it before they can learn it.
“LST Pictures,” by Hawk

A must know technique for cab growers.
“Everything you need to know about the SCROG method,” presented by Joe Budden

Thanks to Underground Man, who went through a lot of threads, to save someone else from having to search through the same ones.
“Links to SCROG Grows,” by Undergroun Man….hlight=v-scrog

Not recommended for volume curing, but, if you need a quick method to sample a small bud, this works pretty well!
“Very Quick, Quick Dry Method,” presented by Stayhigh149

This method is not for the connoisseur. It virtually eliminates aroma and taste. But, if stealth is your aim, it doesn’t get much more on target, than this.
“Water Cure 1,2,3, ala TK,” by Texaskid
“Water Cure,” by NiteTiger (Single post)…7&postcount=28

If the previous curing methods leave you wanting, try this…
“A perfect cure every time,” by Simon

When the student is ready, the teacher will appear.
“I need tips on making seeds,” by Shmokin

I wonder if they have flower pots somewhere in the capital rotunda?
“Overgrowing the Planet – the use of Seed Bombs,” by Smoking Moose

You’re going to have to deal with it, so what are you going do with it?
“Creative ways to dispose of pot trash,” by Avon Barksdale

“The Reveg Thread,” by Thundurkel

Intermediate to Skilled:

I include these in the more advanced category, not because they are difficult to do, but because, while one f**k-up with the cab could cost you your grow, one f**k-up with electricity could cost you your life. Make sure you know what you’re doing.
“Basic Principles of Good Wiring,” by I.M. Boggled
“The Ultimate Beginners Guide to PC Fans,” by ScrubNinja
“Yayyy! My First Colloidal Silver Generator” by PhenoMenal
“Light Wiring Help,” by Minigreens (wiring sockets in parallel)
“Building a Fluoro Tube Setup – DIY,” by Bounty29

Sativa’s have a reputation, undeserved or not, of being difficult to manage indoors. “A guide to Growing Sativa’s,” at the start of this thread by Motaco, should take a bit of the troublesome out of growing Sat’s in a cab. Well written, informative, and enlightening.
“Revival of the Ultimate Sativa GROW Thread,” by Motaco

Evidently some have taken Motaco’s words to heart!
“MICRO HAZE / SATIVA THREAD,” by mostnonymouse

Every time I read this I learn something new. Thanks, BT!
“Big Tokes – Basic Water Chemistry!!,” by Big Toke

Time and space are linear; life is rythmic and circular.
“aquaponics – for the fish folk,” by Hephaestus

An essential tool…period!
“All About Bonsai Moms/Mums,” presented by Guerilla1018

The why of keeping a mother…bonsai or not.
“Cloning with JJScorpio,” by JJScorpio

Whether or not you ever use this method, it’s still good to know.
“Holding clones in stasis? (The refridgerator method),” by I. M. Boggled

“Phytochrome and Forced Flower Via Spectrum Alteration,” by Mr Celsius….42#post1625942

An alternative to PVC lightproof intake vents.
“DIY A new angle on light proof vents,” by ScrubNinja

This goes towards anyone who’s concerned about plant count. I recommend a read through, but if not, go to post #52. A nice quasi-collaborative effort from Sunnydog and Expertsetup.
“Grafting?” by Sunnydog

A discussion on the techniques involved.
“Grafting to Make a Multistrain Mother,” by Anima

By itself or combined with the grafting threads above, an attractive thought indeed!
“30+ Strains and Hybrids for Under $200” by I.M. Boggled….=30%2B+strains

As if some of you needed another reason to be a strain whore!
“How To Store Seeds for Years…,” by EmpireSeeds

Detailed and thorough!
“Air cooled reflector testing with digital footcandle meter,” by Pico

A cursory look at uber-stealth.
“Hidden Rooms and Such…” by ItsAllOver

In most cases, I believe form should follow function. Thank the stars, that there are exceptions! A stroll through anyone’s definition of sanctuary.
“Mmmm plants,” by Sheriff Bart

A Variety of Cabs

A great wardrobe style cab and a great how-to. Props to Hoosierdaddy.
“My Cabinet (w/DIY’s and lots of love)” by Hoosierdaddy

Geez, Louise!
“Destroyer on Ice – 250CMH Freezer Grow,” by FreezerBoy

Thinking outside the box…so to speak.
“The High-Pod” by Inefectualize

Surely, at some point, the question ceases to be, “Where can I grow?” To become, “Where can’t I grow?”
“Hornet’s 250W Attic Cab (First Grow),” by Headless Hornet

Yes! It really is that simple. Thank’s to Tony Danza.
“Here’s a Fun Little Cab I Whipped Up” by Tony Danza (no relation)

There are many PC grows, but, this is the first one I ever read through. I am still amazed!
“Mr Micro Presents: The Nanomachine,” by Mr Micro

You wanna see skills!? 70w HPS in about 1/2 of a cubic foot of space!
“Romantica-turbo/HPS70/nanoclass” by microRU

Off-Site Links:

Please read! I have no reason to suspect the worst from any of the links below, however, I cannot say for certain that they are on the up and up either. A judgement call only you can make as to what your relative security comfort level is.


In all my years, I have had no need to convert kilometers to tablespoons, but you never know.
“Convert just about anything to anything else.”

 You will have to go off-site, from the link below, to download this 3D program (32MB +/-). Whether or not anyone wanted to do so, I felt the option should be presented.
“ICMag Google Sketchup Database,” by Beaner

Say this three times, real fast! “There is an equation for every occasion and an occasion for every equation.” They even have their own Sketchup Edition that is compatible with the regular version.
“The Engineering Toolbox: Resources, Tools and Basic Information for Engineering and Design of Technical Applications!”

As good an explanation, in lay terms, to the properties of light I have found. Or, you can use a search engine for, “Reefkeeping, an online magazine,” and look through their archives for the Feb., Mar., April, and May, 2006 issues.
Part I: “What is Light?”
Part II: “Photons,”
Part III: “Making Sense of Light Measures,”
Part IV: “Color Temperature,”

An onlie guide to troubleshooting HID’s.
“Troubleshooting and Maintenance Guides,” (for HID and linear fluorescent) from Universal Lighting Technologies…des/index.html

I have posted this one a few times and is one of my fav’s. I have printed it out and refer to it often. As I have said before, it’s a bit dated, but still has a lot of relevance to cab growing.
“The International Lighting in Controlled Environments Workshop”

A free HS/college level class!
“An On-line Textbook of Natural History,”

A short and very good explanation of the process!
“Photosynthesis, an introduction”…BioBookPS.html

A crash course in…well, plant development and physiology, from the U. of Saskatchewan.
“Plant Development and Physiology,” (A pdf download)

A trove of information on all things botanical.
“Plant Physiology,” pub. by The American Society of Plant Biologists

One of the best free books you will ever own.
“Marijuana Botany,” by Robert C. Clark (text only)…howarticle=411

The archives aren’t all that extensive, but, what they do have are pure nuggets of historical, anecdotal, medicinal, and scientific articles of gold about Cannabis Sativa L.
“Journal of the International Hemp Association,”

Research Papers, articles, and items of interest:

I would consider this one as something of an introduction to the next link.
“Dioecious Plants. A Key to the Early Events of Sex Chromosome Evolution,”

If you’re anything like me, some of this may as well be written in Greek. But, that doesn’t mean you can’t grasp the gist of what the author has to say.
“Boys and Girls Come Out to Play: The Molecular Biology of Dioecious Plants,” Ainsworth (A pdf download)

Who, what, where, when, and why.
“Photoreceptors in Plant Photomorphogenesis to Date,”

Do plants have to reset their clocks to Daylight Savings Time?
“Photoreceptors and Regulation of Flowering Time,”

Want to increase your germ rates?
“Germination Micro-Site Perception: the Role of Light Quality and Quantity,”…htQuality.html
“Smoke Induced Germination,”

A collection of updates, editorials, and correspondences.
Concepts and terminology of apical dominance
Control of Outgrowth and Dormancy of Axillary Buds
Early Evolution of Photosynthesis
Flavonoids and Isoflavonoids: From Plant Biology to Agriculture and Neuroscience
The Elements of Plant Micronutrients
The Power of Auxin in Plants
The Timing of Flowering
Systems Biology Uncovers the Foundation of Natural Genetic Diversity
Systems Biology of Organ Initiation at the Shoot Apex
Phosphorus Uptake by Plants: From Soil to Cell
Regulation of Root and Fungal Morphogenesis in Mycorrhizal Symbioses
The Circadian Clock. A Plant’s Best Friend in a Spinning World
Stress Under the Sun: Spotlight on UV-B Responses
A UV-B-Specific Signaling Component Orchestrates Plant UV Protection
Maintenance of Shoot and Floral Meristem Cell Proliferation and Fate
UV-B Mediated Responses in Plants
BL Signaling Through the Cryptochromes and Phototropins
The Red Side of Photomorphogenesis
“Making Sense of Senescence” (A pdf download under Updates)

A lot of old wives tales do contain a kernel of truth!
“The Chemical Ecology of Cannabis,” by D.W. Pate

These three links have outdoor grown hemp leanings, but still has value as a reference for the rest of us.
“Microbiological Contaminants of Marijuana,” by McPartland
“A Review of Cannabis Diseases,” by McPartland
“Cannabis Pests,” by McPartland

If this doesn’t scare the hell out of you, then nothing will!
“Killing Cannabis with Mycoherbicides,” by McPartland

From one of the authorities on Cannabis, Robert C. Clarke.
“Physical Evidence for the Antiquity of Cannabis sativa L.,” by Fleming and Clarke

Just For Fun:

From Aristotle to zen.
“Internet Encyclopedia of Philosophy, A Peer-Reviewed Academic Resource,”

I find it refreshing that the central tenet of the definitive book on waging war is, “To win without fighting, is best.”
“The Art of War,” by Sun Tzu

As a point of information!
“The Kyoto Protocol,”

Early in the 19th century Alexis de Tocqueville came to America for a two year study of it’s prison system. He stayed for over ten and traveled extensively throughout the new country. Upon his return to France he wrote and published an insightful critique of American culture. A lengthy read (889 pg), it is a good historical account of early America in the 1810’s/1820’s, as well as still having some merit and credence to American life today. For a study of America and Americans:
“Democracy in America,” by Alexis de Tocqueville

An excellent, free anti-spyware/malware program, with free updates!.
“Spybot-Search and Destroy,”

free top-down WWII based IGOUGO game that was originally designed for a DOS platform but has since been reworked to play on Windows 9X (I am running it on XP with np). It comes with dozens of scenarios and several campaigns or you can download dozens of user designed ones from sites dedicated to the game. If you like chess, you’re going to LOVE this one. To download this huge 475(+/-)MB file, I suggest a download manager (
“Steel Panthers: World at War”

Got a few old DOS games lying around and, on occasion, find yourself reminiscing about the good old days? An x86 emulator with DOS
“DOSBox; Way more FPS than Counterstrike!”

Pack a bowl, sit back, and try to keep up!
North American English Dialects

An odd little place where odd little men do odd little things for odd little reasons. Roll a bigg’un, and leave bread crumbs along the way so you can find your way back.
“Archive of Suppressed, Dormant, and Emerging Sciences”

“There are more things in heaven and earth, Horatio, than are dreamt of in your philosophy.”
“Society for Scientific Exploration”

WTF!? I mean, WTF!? I suggest you don’t hit any paranoia inducing pure sativa’s before you go here! This takes the meaning of “crack-pot” to new levels!
What does it mean?

It’s surprising what one can do with a metal ring! Zero ads and no registration required to access all threads.
M.A.I.L. (Maille Artisans International League)




Charts, graphs, and Illustrations:

Comparative plant sizes.

Energy in……………energy out.

Where “Wattage” = bulb wattage and “Diff. F*” = desired intake to exhaust temperature differential.

I wonder if Caligrower knows the extent his time and effort has paid off for the rest of us. The following CFM chart is based on the above heat transfer formula.

Absorption spectrum of various pigments

Reflective properties of various surfaces

MH and HPS Foot Candle charts.

MH and HPS PAR graphs.

Relative penetration for HPS lamps.

A typical incandescent SPD.

Red/Far-red ratio at End Of Day

Lamp Lumen Depreciation

Kelvin Color Temperature

Pot sizes and volume capacity.

Hydro and soil pH ranges.

A graph of carbon dioxide enrichment levels.

A reference for sound-damping


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