What SCROG asks of a plant
SCROG means Screen of Green. A net sits above the pot. Growers tuck shoots under the net during veg. The goal is an even canopy at one height. Light reaches every bud site at the same distance from the lamp.
Three traits decide how well a strain handles this: stretch after the flip to 12/12, internodal spacing, and branch flexibility. A plant that triples in height fills a net in days, then overruns it. A plant with wide gaps between nodes leaves holes in the canopy. Stiff stems snap during tucking.
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Top pick: Northern Lights
Northern Lights is the safest SCROG pick. Indica-dominant. THC runs 16% to 21%. Flowering takes 7 to 9 weeks. Stretch after flip lands near 1.5x to 2x. Nodes sit close together, so the net fills in 3 to 4 weeks of veg. Branches bend without breaking. Afghan landrace parentage gives a short, wide frame.
Fimming vs Topping: Marijuana Training Differences
Weak point: yield per square meter is moderate. Growers who want larger colas look at the options below.
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Blueberry
THC 15% to 24%. Flowering 8 to 10 weeks. Stretch near 2x. Blueberry shows purple and blue color late in flower. Side branches grow long and level, which suits a 4 inch to 6 inch net gap. Terpenes include myrcene and pinene. Mold resistance is average. Keep humidity under 50% in the final weeks.
White Widow
THC 18% to 25%. Flowering 8 to 9 weeks. A 50/50 hybrid with a compact structure. Resin output is high, which matters for hash and rosin runs. Stretch is 2x. Trim work takes longer than Northern Lights because of leaf density.
Critical Kush
THC 20% to 25%. Flowering 7 to 9 weeks. Critical Mass and OG Kush parentage. Colas get thick and heavy. Buds need a second support layer above the net by week 6. Stretch runs 2x to 2.5x.
Gorilla Glue #4
THC 20% to 28%. Flowering 8 to 9 weeks. Chem Sis, Sour Dubb, and Chocolate Diesel lineage. Stretch hits 2.5x to 3x. This one needs topping in veg and a net placed low. Yield is high when the canopy stays flat. Bad training turns it into one tall column.
Strains that fight the net
Haze lines and pure sativas stretch 3x to 5x. Amnesia Haze, Super Lemon Haze, and similar picks push past the screen in 10 days. Tall landrace sativas need LST or a two-tier net instead.
Numbers to check before buying
- Stretch factor after 12/12
- Flowering days
- Internodal spacing
- Branch flexibility
- Mold resistance for the late flower window