Buy the frame and the net at the same time you buy your tent, not after your plants are already into stretch. The purchase that matters most is a trellis kit with mesh openings between 3 and 4 inches, a frame that clamps onto the tent's vertical poles, and at least two adjustable height positions so you can raise the screen as the canopy fills in. Everything else, string versus rigid grid, plastic versus metal, kit versus hardware store build, is a secondary decision that you can revisit on the next run.
What a SCROG Setup Actually Does
SCROG stands for Screen of Green. You stretch a horizontal net above the pot, then tuck growing shoots under the mesh as they reach it. Each tuck redirects that shoot sideways instead of upward, which turns one tall cola into many tops at roughly the same distance from the light. The result is a flat canopy with better light distribution and less airy lower growth. A screen does not add to the plant's capacity for growth. It changes where that growth goes.
When to Start SCROG: Timing the Screen Right
What to Look For When You Buy
Mesh Opening Size
Openings of 3 to 4 inches are the practical range for photoperiod cannabis. Tighter mesh at 2 inches gives more anchor points but makes tucking awkward once the canopy thickens. Wider mesh at 6 inches is easier to work with but supports fewer tops per square foot. If you plan to run a single large plant under one screen, lean toward 4 inches. For several smaller plants sharing a net, 3 inches gives you finer control.
Frame and Mounting
Look for a frame that attaches to the tent's corner poles with clamps or brackets, not one that stands on legs inside the pot. Pole-mounted frames move with the tent, hold position when you water, and leave the root zone clear. If you build your own, half inch PVC or bamboo works, but you need corner fittings that hold shape under tension. String nets sag over a run. Rigid grids do not.
Scrog vs Sog Cannabis Yield Comparison Review
Height Adjustment
Two positions is the minimum: one about 8 to 12 inches above the pot for early training, and one higher for a second screen or for late stretch. Some kits use sliding collars on the tent poles, others use hook and loop straps. Sliding collars hold position better. Straps are faster to move.
Access and Maintenance
Check that the net does not block your tent door or your reach into the back of the canopy. A screen that spans the full footprint is fine in a tent that opens on three sides. In a front-only tent, leave a 6 to 8 inch walkway or plan to work from one corner for the whole run.
Parameter Bands That Work
- First net height: 8 to 12 inches above the growing medium
- Second net height: 8 to 10 inches above the first, useful for stretchy sativa leaners
- Mesh opening: 3 to 4 inches for most photoperiod setups
- Canopy fill before flipping to flower: about 60 to 70 percent of the screen
- Plant count: one large plant per 4 square feet, or two to four smaller plants
Setup Steps
- Install the frame at the first height before you transplant, so you are not fighting a grown canopy later.
- Top or bend the plant once it has four to five nodes to force side branching.
- Let shoots grow 2 to 4 inches past the mesh, then tuck each one under the nearest opening and slide it outward toward an empty square.
- Repeat every two to three days during stretch. Tucking works best while stems are still flexible.
- Flip to a 12/12 light cycle when the screen is about two thirds full.
- Keep tucking through the first 10 to 14 days of flower, since stretch continues after the flip.
- Add the second net once vertical growth slows, to hold colas upright under their own weight.
Pitfalls to Avoid
- Installing the screen after stretch starts. Stems harden and snap instead of bending.
- Letting the canopy run past the frame edges. Buds outside the light footprint stay loose.
- Choosing a net with no height adjustment. You end up cutting it or tying it to the poles.
- Skipping airflow. A dense flat canopy traps humidity, so keep a fan moving air under and through the screen.
- Buying a kit sized for a larger tent. A loose net wastes squares and sags in the middle.
FAQ
Do autoflowers work on a SCROG?
They can, but the training window is short. Use a single net at 8 to 10 inches and tuck during the first two to three weeks only.
How high above the pot should the screen sit?
Eight to twelve inches is standard. Lower screens make watering and trimming difficult. Higher screens leave a long bare stem section under the canopy.
Can I reuse a trellis net between runs?
String nets can be washed and reused once or twice before they lose tension. Rigid grids and PVC frames last for many cycles.
What if the plant outgrows the screen?
Tuck what you can, then let the rest rise. A second net installed 8 to 10 inches above the first handles the overflow without crushing flower sites.