Screen of Green

Discussion in 'Screen of Green (SCROG)' started by snickelfritz, Nov 11, 2006.

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  1. snickelfritz

    snickelfritz Weed College Hall Monitor


    Scrog or SCREEN OF GREEN is one of the most productive and easiest ways to grow indoors. Now lets not get this confused with the Sea of green method.
    SOG involves no training nor does it have one item a scrog always has. A screen. Scrog has been around for many years. Before HID's were introduced many used floro's with this method with good success.
    Now lets talk about the scrog for a little bit here. What is a scrog? What is screen of green? Well, it is just that. A screen is the main character of scrog. It is usually made of wire or something sturdy enough to hold back the growing canopy. This wire should have some holes in it about 2x2inches in size so that the plant mater can easily grow up through the wire and be supported by it. The wire is secured between the grow medium and the lamp at a distance determined by the size of your lamp. We will get into that later. The plants grow through the screen about 3-4 inches and then are pulled back under and spread out where YOU want them to grow. Its as easy as that folks.

    Getting Started

    The SCREEN
    Remember at least 2x2inch squares. You can use chicken wire as well or even some tightly strung rope, but I would suggest the wire. You need something strong to support the buds and hold back the canopy growth. The screen needs to be cut to size. The size of the screen is determined by the size of your lamp. Remember that to get the good bud formation you want 50 watts per square foot so your screen size should not exceed that. Check the examples below.

    150hps screen size 1.75ft x 1.75ft

    250hps screen size 2.25ft x 2.25ft

    400hps screen size 2.91ft x 2.75ft

    600hps screen size 3.45ft x 3.45ft

    1000hps screen size 4.4ft x 4.5ft

    If your screen exceeds the 50wpsf thing alittle. Thats perfectly okay. Just dont over do it. Now once you've determined the size of your screen and cut it to size. Situate it over your grow area and secure it into place. Just a few screws will do the trick. You need to figure out where to set the screen. First, a few questions to ask. Is your lamp air cooled and what size is your lamp? These two questions determine how close you can get to your canopy. This is very important stuff. The closer you get the better off you are. If you do not have air cooled lamps then a simple fan blowing between the canopy and the the lamp should do the trick. Okay, now lets set that screen. Here's some examples of screen settings for HPS lighting. These are not exact settings. They are just a baseline idea. If you can get your lamp closer. Good for you. If you can't. Thats okay too... Dont worry. If you've got the right watts per footage they will produce.

    150hps 10-12 inches
    250hps 12-15 inches
    400hps 16-20 inches
    600hps 20+
    1000hps 24+

    How Many Will I Need Under The Screen? Usually the rule is one plant per square foot of screen. Having less plants can be a good thing if LEO happens to discover your illegal activity..:rolleyes2:.....Remember with fewer plants you will have to veg a bit longer but be patient and hang in there. Its well worth the wait.

    The spacing between the plant medium and the screen will need to be large enough to allow you room to manipulate your plants during the training phase, usually use around 8 inches. Some people use more/less.

    What Is The Best Strain To Grow In A Scrog? Most any plant strain can be grown without much difficulty using a scrog. The secret is in the screen. Some strains require more training than others but that is the only difference. Heavy yeild indica's are excellent scrog candidates but the unruley sativa can really shine with proper training and timing.

    Vegging: Here is where alot of people make mistakes. They get in a fired up hurry and get confused somehow. Flip their shit over to 12/12 way to soon and wonder why their screen never filled up. At that point the screen is nothing more than a support system for the plant. Normally one would veg a plant till the screen is 70-80 percent full before switching over to the flowering cycle. Having knowlege of how much your strain stretches is helpful when determining when to switch to flowering. For example: If one had a very stretchy sativa. You would want to start flowering her with much less of the screen filled. Just the opposite for a nice stunted indica. Timing has alot to do with scrog.

    Pulling It Back Through: Okay, so you've got some growth through the screen... Reach under the screen and pull that branch back under the screen and place it where you want it to be. Even if it takes tying it in place with some plastic twisty ties. Just get the growth under the screen first. In the next few weeks. You will see were to guide the new growth to best suit your needs.

    Training: Scrog is not natural growth for the marijuana plant. It must stress the shit out of them the whole cycle of life. Imagine taking a plant that usually grows anywhere from 3-12 feet and making it grow in a space no larger than 2 foot. Training begings in the pulling it back through section. Try to situate your main branches towards the barest parts of your screen. They will branch out the most and usually be the largest bud in the bunch. Use some kind of uniformity to your laying out of the branches. Crisscross/ zigzag whatever you use. Remember there is going to be alot more branching when flowering kicks in high gear. So allow some room for that as well. Lesser buds that are now exposed to more light are then encouraged to grow upwards toward the screen. It may require some leaf triming.

    Leaf Trimming: Now we need to chat about a touchy subject. Somethings gotta give and its not going to be bud. lol......Here's my rule on trimming. If the leaf is in the way of light for a bud site then it needs to be removed. Sometimes you can tuck the leaf instead of removing. Use good judgement when trimming. To much is not a good thing here. Trimming continues into flowering ending during the later stages of flowering. Its all about light penetration and bud sites in a scrog.

    Timing: Timing is critical when it comes to a scrog grow. You must be paying attention to the progress of your grow in order to know when to induce flowering. Knowing what strain you are dealing with and what the growing characteristices of the plant are is very helpful when it comes to timing. As mentioned above if you induce flowering too early, you will have alot less of a yield. However, if one was to wait to long. The same can happen as well. An overcrowed canopy is just as much a mess. An out of control scrog is just that. A mess. Not something you want to deal with. Remember, the plants you start to flower are probably going to double in size. Stand back and get a visual picture of that in your head. Ask yourself some questions. If I start flowering now. Can I visualize how big they will get? Do I have enough vegetative growth to start flowering? Do I have to much? Is it time? Time to start flowering?

    Now the decision part comes into play. Just how far over the screen do you want your buds to be? If you stop training them early in the stretch. They will grow al ittle above the screen (maybe 3-6inches depending on the strian). If you continue training them until they start to top out, they will grow only a little more and most of the bud will form right in the screen. This technique is great for those stretchy sativa's. However when doing this method keep an eye out for mold and try to have as much air flow between the buds as possible.

    Clones/Seed Grows: Here's an interesting topic that is sure to generate a few questions. I suggest clones for scrog growing over seed anyday of the year. Why? With clones you usually already know the characteristics of the plant and how it will perform. With seed its usually a guessing game as to which pheno your going to get unless they are true F1 seed. Plus with seed you dont know the sex yet. Ever tried untangling a male from a screen? Not something I would suggest doing. lol......Anyways, if you grow from seed, be sure you have cloned the lot and know who your girls are first before going under the screen. This will save you alot of hassle later on.

    Damage Control: If you move branches around and bend them, eventually somethings gonna give. Dont freak out. Its not the end of the world. Marijuana is an amazing plant that can recover from alot of damage naturally without help from humans but in this case you want to help if you can. First aid for the injured marijuana plant is simple. Just support her wound and leave her alone. She will take care of it on her own. Unless you break her completely in half she can be saved usually. You can splint the wound or support it with some heavy gauge wire around the stem. If the break is not that bad and the branch can somewhat support itself. Leave it alone. A knot will form at the break and most times an explosion of growth will happen above the damaged area. At times even new growth sometimes sprouts from the knuckle formed.

    Flowering Cycle: Once a few trimmings are done and all is set in place flowering in a scrog is pretty uneventful. Good time to start thinning out your undergrowth.

    Undergrowth: The undergrowth is not that big of an issue here. Its an area that should be kept clear of dead leaves and you should also ensure that proper ventilation can get through the canopy via the undergrowth. If it cant, then thin out some growth. This is an area that is dim and often humid. An open invitation for not so good things to come visiting.
    Some people have mentioned putting a light down there. Why? There's no need for a light down there. There are no buds to be harvested there. Just stems that support the canopy. If one were to put a light there, they would just be adding to the congestion of leaves already growing. Not good. It is a good idea to clear out your undergrowth as your scrog takes shape and you have taken the clones that you need for the next grow. Trim all remaining sprouts left on the stems and any other undergrowth. Leave a little growth. Use some common sense here. Take out the sites you know are not going to make it to maturity. This will help the plant direct more energy towards the larger buds instead of wasting energy on the smaller ones.

    Ventilation: Here's an issue that can not be overlooked. Once a scrog has been established it is a leafy sight to behold. Air circulation becomes critical as the buds begin to form and things start to get packed in the box. 24hr air movement is suggested 7 days a week. Better safe than sorry. Mold sucks.

    Even Canopy: Your canopy does not have to be perfectly even. Just close. The idea behind this is even light distribution. We are looking for a field of buds here not a forest like in SOG. If a dominate bud is allowed to overtake the canopy, it is defeating the purpose of the scrog. Bring her down to size with the rest. You want a somewhat even field of buds to deal with. Not a forest of untamed trees. The even canopy is easy to accomplish if you have been following the steps outlined above.

    TrickyTip: Occasionally you will have a stretcher that decides that she wants more light than the rest of her friends. This often happens when the branches are competing for light. If one gets out of hand there is a simple solution to taming her back into the fold of the others and possibly giving her a burst of growth. Reach under the screen and find her stem. Half way up her stem start to pull her back through the canopy till she is even with the rest. Now where she is bent. Crush her at the bend with your fingers. Dont smash it in half. Just crush the stem so as it would not be able to support itself if it were to stand alone. As mentioned above. It will heal with vigor and you have solved your canopy problem.:punk:

    * Special thanks to Joynt for the great info. :)
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