What screen of green means
Screen of green, or SOG, is a grow style built on many small plants instead of a few big ones. You keep the vegetative phase short, flip to 12/12 early, and let each plant push up one dominant top cola. A horizontal net or trellis above the pots holds those colas at the same height so light lands across a flat canopy. The payoff is a fast turnaround and very little lower popcorn to trim.
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The net is the least important part of the setup. Plant count and timing do the real work.
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SOG vs ScrOG
These get mixed up constantly, and the mix-up costs time. ScrOG also uses a screen, but the method is different. You run fewer plants, veg them longer, and bend and weave branches through the net to fill the space by hand. SOG skips the weaving. The screen sits there as support and as a height reference. Numbers fill the canopy instead.
how to build a scrog screen for weed
If your legal limit is four or six plants, ScrOG is the better fit. If you can legally run more, SOG finishes faster and needs less hands-on training.
how to build a scrog screen for weed
Genetics and pot size
SOG rewards uniformity. Look for clones from one mother, or seeds from a stable line, so every plant finishes at roughly the same time. Indica-dominant and short-flowering hybrids work well because they stay compact, stretch less, and stack a single heavy top. Sativa-leaning plants with long internodes fight the whole concept.
Small pots are normal here. One to three gallons is common, since the plant never builds a large root mass. That means the medium dries out fast, so plan on feeding more often rather than heavier.
Plant density and spacing
One plant per square foot is a reasonable starting point. Some growers push toward four per square foot with small clones and heavy lighting, but air movement becomes the limiting factor at that density. Spacing should leave a gap between pots so humidity does not sit in the canopy.
Light and airflow
A flat canopy only helps if the light is even. Check the corners with a meter or a phone sensor, because edges usually run 20 to 30 percent weaker than the center. Raise fixtures if the middle is frying while the sides are dim.
Airflow matters as much as light. A dense carpet of buds traps moisture. Keep one oscillating fan above the canopy and one moving air under it, and keep humidity in the low 50s through flower.
Timing the flip
From rooted clones, one to two weeks of veg is usually enough. Flip when plants are 8 to 12 inches tall and expect them to roughly double during stretch. If you wait until they look full, you will end up with a tall tangle instead of a screen.
Feeding and environment
Treat a SOG run like a shallow, fast system. Smaller pots mean smaller nutrient buffers, so feed lighter and more often, water to runoff, and watch runoff EC instead of guessing. Keep temperature in the mid 70s to low 80s Fahrenheit with lights on and drop it 8 to 10 degrees at night.
Mistakes that flatten a run
- Vegging too long, which turns the screen into a ceiling
- Mixing clones of different vigor in the same tray
- Leaving the outer edge of the tent underlit
- Running more plants than your state allows
- Skipping defoliation under the net, then fighting mold later
What to expect at harvest
SOG wins on speed and consistency, not on grams per plant. Per plant yields drop, per square foot yields hold steady, and the harvest finishes in one pass instead of a staged chop. I would rather see twelve even clones than twenty stragglers, because uniformity is the entire point of the method.