The ScrOG method, short for Screen of Green, is a popular cannabis training technique that uses a horizontal screen to create a flat, even canopy packed with bud sites. By weaving growing branches through a mesh screen and spreading them out evenly, growers ensure that light reaches as many tops as possible, maximizing the productivity of their space. ScrOG is especially well suited to indoor grows with a single strong light, where even light distribution makes a big difference. Though it takes some patience and attention during the vegetative stage, the payoff is a highly efficient canopy. This guide explains, in plain prose, how ScrOG works and how to apply it successfully.
What ScrOG Is and Why It Works
At its core, ScrOG is about training plants to grow horizontally across a screen rather than vertically, so the canopy becomes a flat plane of evenly spaced bud sites. A screen, typically a net or mesh with openings, is placed above the plants, and as the branches grow up to it, they are tucked and woven through the openings to spread them outward. This even distribution means light falls uniformly across the whole canopy instead of concentrating on a single tall cola, so far more buds develop fully. The technique works because cannabis buds thrive on direct light, and by filling the screen with an even spread of tops, you give each one strong exposure and make the most efficient use of your light and space.
Setting Up a ScrOG
Setting up a ScrOG begins with positioning a sturdy screen at the right height above your plants, high enough to allow some growth beneath it but low enough that branches reach it during the vegetative stage. The screen should be securely anchored so it can support the weight of the developing canopy. Many growers combine ScrOG with topping or low-stress training beforehand to encourage multiple branches, giving them more growth to fill the screen. As the plants grow up and reach the mesh, you begin the tucking and weaving process that defines the technique. Choosing a screen size that matches your grow space and light footprint ensures the canopy will be well lit from edge to edge.
Training Through the Screen
The heart of ScrOG is the ongoing work of guiding branches across the screen during vegetative growth. As shoots grow up through the openings, you gently tuck them back down and weave them horizontally, spreading them across the screen so they fill the empty spaces evenly. This continual tucking keeps the canopy flat and prevents any single branch from shooting up and dominating. The goal is to cover the screen with an even network of branches before flowering begins, so that when the plants start producing buds, every opening in the mesh hosts a developing cola at a similar height. Patience during this stage pays off, since a well-filled screen sets up an exceptionally productive flowering period.
Flowering and Harvest with ScrOG
Once the screen is well filled and you switch the plants to flowering, the branches woven through the mesh will begin developing buds along their length. During the early stretch of flowering, you may continue light tucking to keep the canopy even as the plants grow, but heavy training is generally eased off once buds begin forming in earnest. The screen also provides valuable support, holding up the heavy colas as they fatten so branches do not bend or break under the weight. Maintaining good airflow through the dense canopy helps prevent moisture problems, and as harvest approaches you will find a screen filled with numerous well-lit, evenly developed buds, the signature reward of the ScrOG method.
Frequently Asked Questions
What is the main benefit of ScrOG? ScrOG creates a flat, even canopy where light reaches many bud sites uniformly, making highly efficient use of your light and space. This often results in more even, well-developed buds across the whole plant.
When do I put plants under the ScrOG screen? The screen is positioned during the vegetative stage so branches grow up to it and can be woven through the mesh. The aim is to fill the screen evenly before switching the plants to flowering.
Is ScrOG good for beginners? ScrOG takes patience and regular attention but uses gentle, low-stress techniques, so motivated beginners can succeed. It pairs well with topping and low-stress training to provide enough branches to fill the screen.