Growing Amnesia Haze with SCROG

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What SCROG Is

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

SCROG is a form of low-stress training (LST) combined with active canopy management. It differs from Growing Original Haze with SOG, which uses many small plants flowered early rather than fewer, heavily trained plants.

Why Growers Use SCROG 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 ^[2]. Left untrained, Amnesia Haze produces a tall central cola and long, airy side branches that tend to bend or fail 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. The horizontal net forces branches to grow laterally rather than vertically, letting growers fit more developed plants into fixed tent dimensions.
• Structural support for long, airy Haze-style colas that lack the inherent stiffness of dense, shorter strains Anecdote. The net physically holds up branches and distributes weight as buds develop.
• Even canopy surface across many bud sites Weak / limited. Horticultural research on light interception in flat canopies supports the principle that uniform canopy geometry uses overhead light more efficiently ^[3], though cannabis-specific controlled trials comparing SCROG to untrained plants are scarce.

The common forum claim that SCROG "doubles yield" is folklore without published support Anecdote. Expect uniformity and structural benefit, not guaranteed yield gains.

When to Start and Stop Training

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 in the horizontal plane.

Stop weaving at the end of the stretch phase—for Amnesia Haze, that is roughly the end of week 3 of flowering. After this point, branches harden and mature with lignin, and forcing them downward risks snapping them and damaging forming flowers. From week 4 onward, switch to defoliation and removal of weak lower growth ("lollipopping") rather than continued training.

How to SCROG Amnesia Haze: Step-by-Step

1. Choose your screen. A soft trellis net with 5–7 cm (2–2.5 inch) squares is standard ^[1]. Rigid metal or PVC grids work but are harder to remove at harvest. Typically, one Amnesia Haze plant fills a 60×60 cm to 90×90 cm screen.

2. Mount it level and secure. Attach the screen to tent poles or a dedicated frame so it is taut and level. A sagging net creates uneven canopy height and hot spots under your grow light.

3. Veg long enough to fill the screen. Plan for 4–6 weeks of vegetative growth after the plant has recovered from 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, do not 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 distributed across the net surface.

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 during the first 2–3 weeks of flower.

6. Weave through the stretch phase. Keep tucking new vertical growth until stretch ends (roughly week 3 of flower). After this, stop training to avoid snapping mature branches.

7. Lollipop underneath. Remove small, shaded growth below the screen. Growth in deep shade will not develop quality flower and only diverts energy Weak / limited.

8. Support heavy colas late in flower. Even with the screen, dense Amnesia Haze buds may need additional yo-yos or stakes in weeks 8–10 to prevent branches from bending or breaking under bud weight.

Common Mistakes

• Installing the screen too high. If the net is 40+ cm above the pot, plants will shoot straight up through it before you can train them horizontally. Install at 15–25 cm above the rim.
• Flipping to flower too early. Amnesia Haze's stretch is dramatic; flipping with a half-full screen means you will end up with branches overshooting the tent or unevenly filled net squares.
• Continuing to train after stretch ends. Late-flower branches are lignified and loaded with developing buds. Bending or tucking them after week 3 of flower risks snaps and damage to forming flowers.
• Neglecting airflow and humidity. A dense, flat canopy holds moisture. Cannabis is vulnerable to bud rot in humid conditions; Amnesia Haze produces moderately dense buds ^[4]. Defoliate strategically to open up the canopy and maintain relative humidity below ~50% in late flower.
• Treating SCROG as a yield shortcut. The real value of SCROG is uniformity, structural support and optimized light use, not raw grams per harvest.

Related Techniques

• Topping and FIM — Cutting the growing tip to force multiple main branches. Often paired with SCROG to create the symmetrical branch structure you will weave.
• Low-stress training (LST) — Tying branches down without a net. Similar principle, less structured than SCROG.
• Mainlining / manifolding — A symmetric topping method that produces an even number of equal colas, sometimes trained under a screen for advanced growers.
• Growing Original Haze with SOG — Many small plants flowered quickly. Opposite philosophy: quantity of plants rather than training few plants heavily.
• Defoliation and lollipopping — Removing fan leaves and lower growth to improve light penetration and airflow, typically paired with or following SCROG.

Sources

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