What Size SCROG for a 3x3 Grow Tent?
For a 3x3 grow tent, use a SCROG screen that measures about 32 to 34 inches square. That leaves a little room for tent poles and lets you reach the back corners. The mesh openings should be 3.5 to 4 inches. Mount the screen 8 to 12 inches above your growing medium.
Screen dimensions
A 3x3 tent has an interior footprint of roughly 36 by 36 inches. A 36-inch screen will usually fit, but it can be tight against the poles. I prefer a 32-inch square because it gives a finger's width of clearance on each side. If you buy a pre-made net, look for one labeled for 3x3 tents. If you build your own, cut your frame to 32 or 33 inches.
Best Scrog Net for Cannabis Grow: Mesh, Size, and Top Picks
Mesh size
Mesh openings of 3.5 to 4 inches are the sweet spot. Smaller squares, like 2 inches, make it hard to tuck thick branches during late veg. Larger squares, like 6 inches, give less support and let buds flop. A 4-inch mesh with soft string or coated wire is ideal. It holds the plant without cutting into stems.
cannabis scrog setup with pvc frame
Screen height
Set the screen 8 to 12 inches above the top of your pot or growing medium. That puts it roughly 20 to 24 inches from the floor for a standard 5-gallon pot. If you grow sativas with a lot of stretch, go with the higher end. Indicas can handle the lower end. The goal is to give branches room to grow through the screen before you flip to flower.
how many plants under a scrog screen
How many plants under one screen
You can run 1 to 4 plants in a 3x3 SCROG. One plant needs a longer veg time to fill the screen, but it keeps things simple. Four plants will fill the screen faster and give you a more even canopy. Two or three plants is a good middle ground. The screen fills up when about 70 to 80 percent of the squares have a branch poking through.
Installation tips
- Attach the screen to your tent poles with zip ties or clips so it stays taut.
- Weave branches under the screen as they grow, moving them outward toward empty squares.
- Flip to 12/12 lighting once the screen is mostly full, then let the stretch fill the rest.
- Keep trimming leaves below the screen so energy goes to the tops.
Common mistakes to avoid
Using a screen that is too small wastes tent space. Using a screen that is too large can block your access to water and prune. Mesh that is too tight makes tucking a pain. And setting the screen too low or too high causes a messy canopy. A 32-inch screen with 4-inch mesh at 10 inches above the medium works for most growers.