The most reliable cannabis scrog setup for a home grow is a rigid 2-inch (5 cm) mesh trellis fixed over the canopy at roughly 70% of the plant's final height, run with two to four plants in a 4x4 ft space. It wins on four criteria: how the screen holds up once colas put on weight, whether the mesh grips a stem without cutting into it, how much working room stays open for defoliation and watering, and how well the screen keeps the canopy level through the first three weeks of flower. Every option below is judged against those four points.
What scrogging does to a cannabis plant
Screen of green (scrog) training spreads horizontal growth under a net so that light hits many evenly spaced bud sites instead of one tall main cola. Branches are tucked back under the mesh as they grow, which breaks apical dominance and pushes side shoots upward. The result is a flat canopy that uses the footprint of the light, keeps tall colas out of the hot zone near the fixture, and makes airflow and inspection easier. CBD-rich hemp cultivars grown indoors respond to the same training as high-THC types, so the technique applies either way.
Cannabis Scrogging Setup Instructions
Top pick: rigid 2-inch mesh trellis over a 4x4 space
A fixed frame with 2-inch square openings, mounted at the tent corners or hung from the ceiling bars, gives the most control. The mesh is large enough to pass a stem through during stretch but tight enough that a heavy branch rests on the grid rather than sagging between the lines.
Cannabis SCROG Training Setup: Screen Height, Spacing, and Timing
- Pros: holds heavy colas without sagging, keeps a true flat plane, easy to tuck and re-tuck, reusable for many cycles
- Cons: costs more than string or elastic, needs a frame sized to the tent, less forgiving if you set the height wrong
Use it if you run a fixed tent or room, grow two to four plants, and want one screen that stays put for the whole flower cycle.
Alternative: elastic bungee net trellis
Stretch nets hook onto tent poles in minutes and cost little. The trade-off is tension: a soft net sags under a canopy of dense buds, so the plane you built in week one is not the plane you get in week seven.
- Pros: quick to install, no tools, packs flat, good for a first run
- Cons: sags under weight, openings shift as it stretches, harder to keep a strict level canopy
Use it for a first scrog, a small 2x2 or 3x3 tent, or a trial run where you want to learn the tucking rhythm before buying a rigid frame.
Alternative: DIY PVC frame and twine
A frame built from PVC pipe or wooden battens with twine run in a 2 to 3 inch grid is the cheapest route and the most adjustable, since you choose the spacing and the height.
- Pros: low cost, custom size, mesh spacing you control, easy to cut and rebuild
- Cons: twine stretches and degrades under light, sharp pipe edges can abrade stems, build time runs an afternoon or more
Use it for odd-shaped rooms, oversized plants, or a budget build where a store-bought frame will not fit.
Criteria that decide the outcome
Mesh size
Two-inch openings suit most indoor plants. Smaller openings (1 inch) give finer control but make tucking and harvest slower. Larger openings (4 inch) let branches drop through and defeat the purpose.
Screen height
Set the screen 8 to 12 inches above the pot rim for plants started from clone or a short veg. Leave enough clearance to reach under the canopy with a watering can and pruners.
Timing
Install the screen during late veg, then flip to flower when the mesh is about 70% full. Many varieties stretch 50% to 100% in the first three weeks of flower, and that stretch is what fills the remaining space.
Plant count
Two to four plants fill a 4x4 screen faster than one large plant and give you a backup if a stem breaks during training.
How to scrog, step by step
- Top or bend the main stem once the plant has five or six nodes so lower branches catch up.
- Install the screen at your chosen height and lower the light only as far as the flat canopy allows.
- Tuck each branch under the mesh as it clears the opening, pointing growth outward toward empty space.
- Repeat every two to three days during stretch. Stems stiffen fast, so late tucks risk snapping.
- Defoliate leaves that sit under the screen and block airflow, and remove weak lower shoots.
- Stop tucking about three weeks into flower and let the tops rise. Support heavy branches with stakes or a second net if needed.
Mistakes that flatten yield
- Flipping to flower with the screen half empty, which wastes the stretch
- Stuffing too many plants under one screen, which creates shade and stagnant air
- Setting the screen so low that watering and inspection become a wrestling match
- Leaving dense foliage under the mesh, which invites mold and pests
- Tucking hard on brittle stems instead of bending them over a few days
Which setup fits your grow
- Fixed 4x4 or 5x5 tent, one harvest cycle at a time: rigid 2-inch mesh trellis
- First scrog or a 2x2 to 3x3 tent: elastic bungee net
- Odd room, oversized plants, or tight budget: DIY PVC and twine with 2 to 3 inch spacing
- CBD hemp cultivars in a small indoor space: bungee net at 10 inches above the rim, two plants, flip at 70% fill