Growing Amnesia Haze with SCROG

What SCROG is

Screen of Green (SCROG) is a training method where a horizontal net or trellis is installed above the plants, and new growth is tucked and woven through the squares to create a flat, even canopy. Instead of one dominant cola and many shaded lower branches, you end up with many colas of similar height sharing the light evenly ^[1][2].

SCROG is a form of low-stress training (LST) combined with canopy management. It is distinct from Sea of Green (SOG), which uses many small plants flowered early rather than fewer trained plants ^[2].

Why growers use it on Amnesia Haze

Amnesia Haze is a sativa-dominant hybrid with a long flowering time (typically 10-12 weeks) and pronounced flowering stretch — plants commonly double or triple in height after the switch to 12/12 ^[3][4]. Left untrained, an Amnesia Haze plant produces a tall central cola and long, floppy side branches that tend to bend or snap under bud weight late in flower.

SCROG addresses three specific problems with this cultivar:

• Height control in indoor tents where vertical space is limited Strong evidence.
• Structural support for long, airy Haze-style colas that don't hold themselves up Anecdote.
• Even light penetration across many bud sites instead of one dominant top shading everything below Weak / limited. Horticultural research on light interception in canopies broadly supports the principle that flatter, more uniform canopies use overhead light more efficiently ^[5], though cannabis-specific controlled trials on SCROG vs. untrained plants are scarce.

The common forum claim that SCROG "doubles yield" is not supported by published data for cannabis. Treat it as folklore Anecdote.

When to start and stop

Install the screen during late vegetative growth, typically when plants are 30-40 cm tall and roughly 1-2 weeks before you plan to flip to 12/12. The screen sits 15-25 cm above the pot rim, depending on plant size.

Begin weaving as soon as branches reach above the net. Tuck growing tips under and across to fill empty squares.

Stop weaving at the end of the stretch phase — for Amnesia Haze, that's roughly the end of week 3 of flowering ^[3]. After this point, tucking mature, lignified branches risks snapping them, and forcing bud sites downward can damage forming flowers. From here on, only defoliate and remove weak lower growth (the "lollipopping" step).

How to do it, step by step

1. Choose your screen. A soft trellis net with 5-7 cm (2-2.5 inch) squares is standard. Rigid metal or PVC grids work too but are harder to remove at harvest. One plant typically fills a 60x60 cm to 90x90 cm screen.
2. Mount it level. Attach to tent poles or a dedicated frame so it is taut and level. A sagging net creates uneven canopy height and hot spots under the light.
3. Veg long enough to fill the screen. With Amnesia Haze, plan for 4-6 weeks of veg after the plant has recovered from any topping. Topping the main stem once or twice at the 4-5 node stage encourages multiple main branches, which suits SCROG well ^[1].
4. Tuck, don't yank. As branches grow through the net, gently pull them horizontally into an adjacent empty square. Do this every 1-3 days. The goal is a flat canopy with growth tips evenly spaced.
5. Flip to 12/12 when roughly 70-80% of the screen is filled. Amnesia Haze will stretch aggressively and finish filling the remaining squares in the first 2-3 weeks of flower ^[3].
6. Weave through the stretch. Keep tucking new vertical growth until stretch ends. After week 3 of flower, stop training.
7. Lollipop underneath. Remove small, shaded growth below the screen. Everything below the canopy will not receive enough light to make quality flower and just draws energy Weak / limited.
8. Support heavy colas late in flower. Even with the screen, dense Haze colas may need additional yo-yos or stakes in weeks 8-10.

Common mistakes

• Installing the screen too high. If the net is 40+ cm above the pot, plants shoot straight up through it before you can train them horizontally.
• Flipping too early. Amnesia Haze's stretch is dramatic; flipping with a half-empty screen means you'll finish with a screen that overshoots the tent, not fills it evenly.
• Training after stretch ends. Late-flower branches are brittle and full of sugar-loaded buds. Bending them snaps them.
• Ignoring airflow. A dense, flat canopy holds humidity. Amnesia Haze has moderately dense buds and is vulnerable to botrytis (bud rot) in humid conditions ^[6]. Defoliate strategically and keep RH below ~50% in late flower.
• Treating SCROG as a yield hack rather than canopy management. The technique's real value is uniformity and light use, not raw grams.

Related techniques

• Topping and FIM — Cutting the growing tip to force multiple main branches. Often used with SCROG to create the branches you'll weave ^[1].
• Low-stress training (LST) — Tying branches down without a screen. Similar principle, less structured.
• Mainlining / manifolding — A symmetric topping method that produces an even number of equal colas, sometimes trained under a screen.
• Sea of Green (SOG) — Many small plants flowered quickly. Opposite philosophy: quantity of plants rather than training few plants heavily ^[2].
• Defoliation and lollipopping — Removing fan leaves and lower growth to improve light penetration and airflow, typically paired with SCROG.

Sources

How this page was made

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