Growing Gorilla Glue #4

What is Gorilla Glue #4?

Gorilla Glue #4 (GG4) is a hybrid cannabis strain created by crossing Chem's Sister, Chocolate Diesel, and Sour Diesel. ^[1] It gained popularity in the 2010s for its reported high THC content (typically 18–26%) Weak / limited and dense trichome coverage. [evidence:anecdotal] The strain produces short, stocky plants with thick lateral branching and resinous, tightly-packed buds. The name 'Gorilla Glue' refers to the resin production, not any chemical adhesive property—this is a marketing label, not a botanical characteristic. Anecdote

GG4 is photoperiod-dependent, meaning it flowers when exposed to 12 hours of darkness per day, typical of most cannabis strains. It is not an autoflowering strain, so growers must actively trigger flowering by adjusting light cycles or waiting for natural day-length reduction outdoors.

Why Growers Choose Gorilla Glue #4

Gorilla Glue #4 attracts growers for several documented traits:

High resin production: GG4 develops visible trichomes throughout the flowering stage, making it popular for concentrate production (hash, rosin, distillate). Anecdote

Potency: Lab tests from licensed producers in legal markets have reported THC levels between 18–26%, placing it in the upper-middle range of modern hybrids. Weak / limited This claim is backed by some third-party testing but varies significantly by phenotype and cultivation conditions.

Compact growth habit: The strain produces short, densely-branched plants, making it efficient for indoor space. This reduces the vertical footprint compared to sativa-dominant strains.

Predictable flowering time: An 8–9 week flowering window is standard and reliable, allowing growers to schedule crops consistently.

Established seed and clone availability: GG4 seeds and rooted clones are widely available through licensed seed banks and nurseries in legal regions, reducing the barrier to entry.

When to Start Growing Gorilla Glue #4

Outdoor cultivation: Start seeds or transplant clones outdoors in spring, after the last frost date in your region. In temperate climates (zones 6–9), late April to mid-May is typical. GG4 will naturally flower when day length drops to ~12 hours in late summer/early fall, typically maturing by October. No data

Indoor cultivation: You can start seeds or clones indoors any time of year, since you control light cycles. A common schedule is to veg for 4–8 weeks under 18-hour light, then trigger flowering by switching to 12-hour light. Total time from seed to harvest is typically 12–17 weeks indoors (including germination, veg, and flower).

Clones vs. seeds: Clones are faster (skip germination and early seedling weakness) and phenotypically identical to the mother plant. Seeds take 7–10 days longer but offer genetic variability, which some growers prefer for selecting the best performers.

How to Grow Gorilla Glue #4: Step-by-Step

1. Germination & Seedling (7–14 days) Germinate seeds using the paper-towel method or direct soil soak. Keep temperature at 70–75°F and humidity at 60–70%. Once sprouted, plant into seed-starter mix or rockwool. Provide 16–18 hours of weak light (CFL or 200 µmol/m²/s LED) to avoid stretching.

2. Vegetative growth (4–8 weeks) Transplant seedlings into 2–4 liter pots (or clones directly into 3–5 liters) in quality growing media (coco-coir, peat-based mix, or amended soil). No data

• Light: Maintain 18–24 hours per day at 400–600 µmol/m²/s (high-intensity LED or HPS).
• Temperature: 70–80°F day, 60–70°F night.
• Humidity: 50–65% (GG4 is prone to powdery mildew above 70% during veg).
• Feeding: Use balanced vegetative nutrients (higher nitrogen). Start at quarter-strength; increase gradually. GG4 is moderately hungry but not a heavy feeder.
• Watering: Water when the top inch of soil is dry; ensure pots drain completely.
• Pruning: Remove lower branches and fan leaves to improve air flow. GG4's lateral branching means light pruning keeps it manageable.

3. Flowering initiation (Day 1) Switch light cycle to 12-hour on / 12-hour off. Lower night temperature to 55–65°F if possible (widens day/night spread and can boost terpene production). Weak / limited

4. Early-mid flowering (Weeks 1–4)

• Light: Maintain 600–900 µmol/m²/s to maximize bud development.
• Temperature: 70–78°F day; 60–68°F night.
• Humidity: Drop to 40–55% (critical—GG4 develops powdery mildew and bud rot easily above 60% during flower).
• Feeding: Switch to bloom nutrients (higher phosphorus and potassium, lower nitrogen). Continue at moderate strength.
• Plant structure: Buds form on main colas and secondary branches. Defoliate cautiously—remove large fan leaves blocking bud sites, but keep some canopy to prevent light stress.

5. Late flowering (Weeks 5–8)

• Reduce feeding frequency; transition to half-strength blooming formula by week 7.
• Monitor trichomes with a jeweler's loupe (10× magnification).
• Once 50–70% of trichomes turn milky white and 10–20% turn amber, begin flushing (if using bottled nutrients, run pH-neutral water only for 7–10 days).
• Stop all feeding 7–10 days before harvest.

6. Harvest (Week 8–9) Cut at the base and hang upside down in a dark, cool (55–65°F), dry space (40–50% humidity) for 7–10 days until stems snap. Trim wet or dry (dry-trimming takes longer but is less sticky). Move to airtight jars and burp daily for 2 weeks to cure.

Common Mistakes

Overwatering: GG4's compact root structure and dense foliage make overwatering a fast path to root rot. Water only when soil is dry 1 inch down. No data

High humidity during flower: This is the #1 failure point for GG4. Relative humidity above 60% during late flower creates perfect conditions for powdery mildew and gray mold (botrytis). Use a dehumidifier; aim for 40–50%. Anecdote

Excessive nitrogen in flower: GG4 can lock up calcium and magnesium if fed too much nitrogen late in bloom. Stick to balanced or flower-heavy formulas.

Weak air circulation: Dense canopies trap humidity. Use oscillating fans; never aim them directly at buds (can cause leaf-bruising). No data

Over-pruning: Aggressive defoliation stresses GG4 and reduces yield. Remove only 20–30% of canopy mass at any one time.

Harvesting too early: Impatient growers cut when trichomes are still 80% clear. Wait for 50–70% milky. Early harvest reduces potency and yield. Weak / limited

Neglecting pH: GG4 thrives at pH 6.0–6.5 (soil) or 5.5–6.0 (hydro). Outside this range, nutrient lockout occurs and growth stalls. Test and adjust regularly. Strong evidence ^[1]

Related Techniques

Screen of Green (SCROG): GG4's branching makes it ideal for SCROG. Weave branches horizontally under a net in veg; flower initiation fills the net with even canopy. Yield gain: +15–25% vs. unstaked plants. Weak / limited

Low-stress training (LST): Gently bend and tie branches outward during veg to widen the plant's footprint and reduce apical dominance. GG4 responds well; no shock or stunting. Anecdote

High-intensity supplemental CO₂: In sealed rooms, raising CO₂ to 1000–1500 ppm during light hours can boost photosynthesis and yield by 10–20%. GG4's resin production may also benefit. Weak / limited ^[2] Requires controlled environment and safety measures.

Defoliation during flower: Removing 20–30% of shade leaves in weeks 5–7 improves light penetration to lower buds. GG4's density makes this worthwhile. Do not defoliate in final 2 weeks (stress reduces terpene/cannabinoid production). Weak / limited

Rosin pressing: GG4's high trichome count makes it excellent for rosin (solventless concentrate). Fresh-frozen flower yields 15–25% rosin by weight. Anecdote

Sources

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