GG4 Strain: Grow Guide for Maximum Resin and Yield

What Makes the GG4 Strain Different to Grow

The GG4 strain — officially rebranded as Original Glue after a trademark dispute — is one of the most resin-dense cultivars you'll grow. Phenotypes of this accidental cross between Chem's Sister, Sour Dubb, and Chocolate Diesel produce buds that will gum up your scissors within minutes of trimming. That's not a complaint. It's a sign you're doing something right.

But GG4 will punish lazy growers. Its stretch during early flowering is aggressive. Its colas get so dense and heavy that unsupported branches snap under their own weight. And its compact bud structure traps moisture like a sponge — push humidity past 55% in flower and you're setting up conditions for grey mould. This guide walks through every stage of a GG4 grow with the specific numbers you need to keep it on track.

GG4 Strain Vegetative Stage: Set Up the Structure Early

Keep vegetative time to 4–6 weeks for indoor grows. GG4 is a vigorous grower — you don't need a long veg period to build a solid frame. Aim for 18/6 lighting at 400–600 PPFD during early veg, ramping to 600–800 PPFD by the end of the veg stage. Use our Grow Light Calculator to dial in coverage for your specific tent or room dimensions.

Top at the 4th or 5th node, then wait 5–7 days for recovery before beginning LST. GG4 responds exceptionally well to both topping and SCROG. If you're undecided on technique, our fimming vs topping guide breaks down the tradeoffs in detail. For GG4 specifically, topping followed by a SCROG net set at around 30–40cm above the pot gives you the most even canopy before the flip — and you'll need that even canopy because this strain stretches hard once 12/12 begins.

Install your trellis net, stakes, or plant yo-yos before the flip. You will not have time to rig support structures after GG4 starts building weight in week 5–6 of flower.

VPD and Environment During Veg

• Temperature: 22–26°C (72–79°F) lights on, 18–20°C lights off
• RH: 55–65% during veg
• VPD: 0.8–1.0 kPa
• pH (soil): 6.0–6.8 | pH (coco): 5.8–6.2
• EC (feed): 1.2–1.6 mS/cm during mid-veg

Plan your full schedule before you start — use the Grow Schedule Planner to map out feeding, training, and flip dates so nothing catches you off guard.

Flowering Stage: Managing the GG4 Stretch

This is where most first-time GG4 growers get surprised. Expect 50–100% height increase in the first 3 weeks of 12/12. A plant that was 50cm at the flip can easily reach 90–100cm before stretch stops. If you're in a standard 2m tent, flip when the plant is no higher than 50–60cm to keep canopy-to-light distance workable.

During weeks 1–3 of flower, continue gentle LST to spread bud sites across your SCROG net. Tuck fan leaves aggressively. PPFD should sit at 800–1000 during this stretch phase. Once stretch stops around week 3–4, you can push PPFD to 1000–1200 with CO₂ supplementation if you have it.

Nutrient Strategy: Weeks 4–7 Are Critical

GG4 is a moderate-to-heavy feeder in mid-to-late flower. This is when its resin glands are stacking up and its buds are bulking. Phosphorus and potassium are your priorities from weeks 4 through 7.

• EC (flower peak): 1.8–2.4 mS/cm
• P-K boost: Weeks 4–7, target a P:K ratio that favors 2:3 relative to N
• Flush week: Week 8–9 (or 1–2 weeks before harvest), drop EC to 0.4–0.6
• Cal-Mag: Keep supplemental calcium and magnesium in your feed throughout — GG4 is susceptible to magnesium deficiency, which shows as interveinal yellowing on mid-canopy leaves

If you see interveinal chlorosis between weeks 3–6, that's almost certainly magnesium. Run 1–2g/L of Epsom salt as a foliar or root drench before reaching for anything more complex. Use our Nutrient Deficiency Identifier if you're not certain what you're looking at.

Humidity Management: Non-Negotiable for GG4

GG4's dense buds are its biggest vulnerability. Botrytis (bud rot) can colonise the interior of a cola before you see anything on the outside. Once you flip to 12/12:

• Weeks 1–3: 50–55% RH
• Weeks 4–8: 40–50% RH
• Final 2 weeks: 35–45% RH
• VPD (peak flower): 1.2–1.5 kPa

Run oscillating fans directly across the canopy, not just around the perimeter. GG4's biggest colas need airflow through them, not around them. A dehumidifier on a controller — set to trigger at 52% RH — is worth the investment on this cultivar.

Harvest Timing for the GG4 Strain

Don't rely on the 8–10 week window alone. GG4 phenotypes vary enough that trichome inspection is essential. At 60x–100x magnification:

• All clear/glassy: Too early — THC not fully developed
• Mostly milky white, 5–10% amber: Peak potency harvest window — cerebral, energetic effect profile
• 30%+ amber: More sedative, CBN is increasing — personal preference territory

For most GG4 growers aiming for the strain's signature heavy effect, the 10–15% amber mark hits the sweet spot. Check pistil colour too — 70–80% of white pistils having turned orange/brown typically aligns with the milky trichome window.

Stop all nutrients 7–14 days before harvest and flush with pH-corrected water at 0.4–0.6 EC if you're on a salt-based feed. This clears residual minerals from buds and improves the final smoke.

Drying and Curing GG4: Where the Flavour Develops

GG4's terpene profile — heavy on caryophyllene, myrcene, and limonene — only fully expresses through a proper cure. Rush this and you'll end up with harsh, flat-tasting cannabis that doesn't represent what this strain is capable of. Use our Terpene Explorer to understand GG4's terpene profile in more detail.

Drying Protocol

• Hang trimmed branches upside down in a dark room
• Temperature: 15–21°C (60–70°F)
• RH: 45–55%
• Airflow: Indirect — fans on walls, not blowing directly on buds
• Duration: 7–14 days (check stems: a clean snap, not a bend, means ready)

Curing Protocol

1. Trim to final form and load into wide-mouth airtight glass jars at 60–65% RH (use Boveda 62 packs)
2. Burp jars 2x daily for the first 7–10 days — open for 10–15 minutes each session
3. Reduce to once daily through weeks 2–4
4. By week 4–6, check weekly — GG4 develops its full terpene richness around the 5–6 week mark

Use the Dry & Cure Timer to track your drying and curing milestones so you don't lose count across weeks.

Expected Yield and Grow Data

Indoor GG4 yields 500–750g/m² under optimised conditions — meaning dialled environment, 600–1000W of quality LED output, correct training, and a clean nutrient run. Real-world results for most home growers land in the 350–500g/m² range. Use the Yield Calculator to project your expected return based on your specific setup.

Based on grow data from over 1,000 tracked journals on the Grow Guide platform, 73% of cannabis grows are conducted indoors — which aligns with GG4's strengths, since indoor control of humidity and light is essential for getting the most from this strain. Soil remains the most popular medium (63% of all tracked grows), and GG4 performs well in both soil and coco, though coco gives you more precise control over EC and feed timing during that critical weeks 4–7 window.

Track your own GG4 grow with a grow diary from day one — it's the fastest way to iterate across runs and catch problems before they compound.

GG4 Strain: Odour and Resin Management

Two practical realities every GG4 grower needs to prepare for:

Odour: GG4 smells intensely of diesel, pine, and earth well before it's ready to harvest. A properly sized carbon filter rated for your room volume — replace it every 12–18 months — combined with negative pressure in your tent is non-negotiable. Size your fan to exchange air every 1–3 minutes for indoor spaces.

Resin on tools: GG4 will coat scissors, trimmers, and gloves within 10–15 minutes of wet trimming. Keep a container of isopropyl alcohol (90%+) on your trim table and wipe blades every 15 minutes. Nitrile gloves are essential. The scissor hash that accumulates is potent — save it.

References

1. Russo, E.B. (2011). "Taming THC: Potential Cannabis Synergy and Phytocannabinoid-Terpenoid Entourage Effects." British Journal of Pharmacology, 163(7), 1344–1364. Foundational research on how terpene profiles like GG4's myrcene and caryophyllene content interact with cannabinoids to shape effect profiles. View source
2. Chandra, S., Lata, H., ElSohly, M.A. (2017). "Light Dependence of Photosynthesis and Water Vapor Exchange Characteristics in Different High-Δ9-THC Yielding Varieties of Cannabis sativa L." Physiology and Molecular Biology of Plants. Documents optimal PPFD and environmental ranges supporting peak cannabinoid synthesis in high-THC cultivars. View source
3. McPartland, J.M., & Russo, E.B. (2001). "Cannabis and Cannabis Extracts: Greater Than the Sum of Their Parts?" Journal of Cannabis Therapeutics, 1(3–4), 103–132. Reviews the role of terpenes including caryophyllene and limonene — key components of GG4 — in modulating potency and flavour. View source
4. Small, E. (2015). "Evolution and Classification of Cannabis sativa (Marijuana, Hemp) in Relation to Human Utilization." The Botanical Review, 81(3), 189–294. Provides taxonomic and agronomic context for hybrid cultivars like GG4 and their characteristic growth structures. View source
5. Grow Guide Platform Data (2026). Internal analysis of 1,000 tracked cannabis grow journals. Data cited: 73.4% of grows conducted indoors; 63.3% using soil as primary grow medium. Unpublished aggregate platform statistics.