Growing Gorilla Glue #4

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What is Gorilla Glue #4?

Gorilla Glue #4 (GG4) is a hybrid cannabis strain commonly described as a cross of Chem's Sister, Sour Dubb, and Chocolate Diesel Weak / limited^[1]. It emerged in the 2010s and became popular in cannabis communities for reported high resin content and potency. The name 'Gorilla Glue' is a marketing reference to resin stickiness, not a botanical or chemical property Anecdote.

The strain is photoperiod-dependent, meaning it flowers when exposed to 12 hours of uninterrupted darkness per day—this is triggered either by adjusting indoor light cycles or by natural day-length reduction outdoors. It is not autoflowering.

Strain-name note: The term 'Gorilla Glue' was trademarked; growers and seed banks use both GG4 and Original Glue to refer to the same or closely related phenotypes. Parentage claims vary slightly between sources, and phenotypes differ depending on the breeder or clone source you obtain.

Why Growers Choose Gorilla Glue #4

High resin production: GG4 develops visible trichomes throughout the flowering stage, making it popular for concentrate production (hash, rosin, distillate) Anecdote. Growers often select it specifically for fresh-frozen rosin pressing.

Predictable flowering window: An 8–9 week flowering cycle from flower initiation is typical, allowing consistent crop scheduling Weak / limited.

Compact growth: The strain produces short, densely-branched plants with minimal vertical stretch. This efficient use of indoor space is one reason it suits Screen of Green (SCROG) setups.

Established seed and clone availability: GG4 seeds and rooted clones are widely available through licensed seed banks and nurseries in legal regions, reducing the challenge of sourcing genetics.

Lab-tested potency: Licensed labs in legal markets have reported THC levels between 18–26% Weak / limited. This places it in the upper-middle range of modern hybrids, though results vary by phenotype, growing conditions, and testing laboratory.

Note: GG4 is not inherently easier or harder to grow than other photoperiod hybrids; its main attraction is resin production and schedule reliability.

When to Start Growing Gorilla Glue #4

Outdoor cultivation Start seeds or transplant clones outdoors after the last frost date in your region. In temperate climates (USDA zones 6–9), this typically falls in late April to mid-May. GG4 will initiate flowering naturally as day length decreases in late summer; harvest maturity varies by latitude and local conditions but often occurs in September or October No data.

For precise local timing, check your regional growing calendar or consult the first-frost date for your zip code.

Indoor cultivation You can start seeds or clones indoors at any time, since you control light cycles. A standard schedule:

• Germination: 7–14 days
• Vegetative phase: 4–8 weeks under 18–24 hours of light per day
• Flowering phase: 8–9 weeks under 12 hours of light per day
• Total from seed to harvest: 12–17 weeks (includes germination, veg, and flower)

Clones vs. seeds Clones skip germination and early seedling weakness, reducing grow time by ~10 days and ensuring phenotypic consistency. Seeds take slightly longer but offer genetic variability; some growers prefer seeds to select the best-performing phenotype for their environment.

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

1. Germination and Seedling Stage (7–14 days)

Germinate seeds using the paper-towel method (place between damp paper towels, keep at 70–75°F) or direct-sow into seed-starter mix. Once sprouted, plant into small pots (2–4 liters) filled with seed-starter mix, peat-based mix, or coco coir.

Provide 16–18 hours of light at low intensity (200 µmol/m²/s from CFL or LED) to prevent stretching. Keep humidity at 60–70% and temperature at 70–75°F. Water gently when soil surface is dry.

2. Vegetative Growth (4–8 weeks)

Transplant rooted seedlings or clones into 3–5 liter pots filled with quality growing media (coco coir, peat-based mix, or amended soil).

Light: 18–24 hours per day at 400–600 µmol/m²/s (high-intensity LED or HPS).

Temperature: 70–80°F during the day; 60–70°F at night. Avoid high nighttime heat, which can promote stretching.

Humidity: 50–65% relative humidity. Higher humidity may increase mildew risk in dense growth.

Feeding: Use balanced vegetative nutrients with higher nitrogen. Start at quarter-strength and increase gradually over 2–3 weeks. GG4 is a moderate feeder; over-fertilization invites nutrient burn and mineral imbalances.

Watering: Water when the top inch of soil is dry. Ensure complete drainage to prevent root rot.

Pruning and training: Remove lower branches and large fan leaves to improve airflow. GG4's lateral branching means light pruning keeps canopy density manageable. Avoid aggressive defoliation; remove only 20–30% of biomass at any one time.

3. Flowering Initiation (Transition Day)

Switch the light cycle from 18–24 hours to 12 hours on and 12 hours off. This triggers flowering. If possible, widen the day-night temperature spread (e.g., 75°F day, 60–65°F night) to support general plant physiology, though this alone does not reliably boost terpene yield.

4. Early-to-Mid Flowering (Weeks 1–4)

Light: 600–900 µmol/m²/s to maximize bud development. Position lights to avoid directly burning buds.

Temperature: 70–78°F day; 60–68°F night.

Humidity: Lower to 40–55% relative humidity. This is critical: GG4's dense canopy and resinous buds trap moisture and are susceptible to powdery mildew and bud rot if humidity remains above 60%. Use a dehumidifier if necessary Anecdote.

Feeding: Switch to bloom-focused nutrients (higher phosphorus and potassium, lower nitrogen). Continue at moderate strength; reduce only in weeks 7–8.

Defoliation: Remove 20–30% of large shade leaves blocking bud sites, but retain canopy to prevent light shock. Avoid heavy defoliation; the plant needs leaves to photosynthesize and produce resin.

5. Late Flowering (Weeks 5–8)

Reduce feeding frequency and transition to half-strength or zero-nitrogen formulas by week 7. If using bottled nutrients, begin a "flush" in week 7–8 by running pH-neutral water (no added nutrients) for 7–10 days. This practice is common but not independently proven to improve quality No data.

Monitor trichome maturity using a 10× jeweler's loupe. Harvest readiness is typically when 50–70% of trichomes appear milky white and 10–20% have turned amber. Harvest timing is a grower preference: earlier harvest (more clear/milky) is often lighter in effect; later harvest (more amber) tends toward heavier, more sedative effects Weak / limited.

6. Harvest and Drying (7–14 days)

Cut plants at the base and hang upside down in a cool (55–65°F), dark space with 40–50% humidity. Hang for 7–10 days until small stem sections snap cleanly rather than bend.

Trim wet (right after harvest) or dry (after hang-drying). Wet trimming is faster but stickier. Dry trimming is slower but less sticky to handle.

Once trimmed and dry, place buds into airtight jars. "Burp" the jars (open for 5–10 minutes) once or twice daily for 2 weeks to release excess moisture and allow even cure. Buds are then ready to use or store.

7. Storage

Store cured buds in airtight jars at 60–65°F and 55–65% humidity. Kept properly, cannabis remains stable for 6–12 months.

Common Mistakes and How to Avoid Them

Overwatering GG4's compact root structure and dense foliage make waterlogged soil a fast path to root rot. Water only when the soil is dry 1 inch below the surface. Err on the side of dryness; cannabis wilts before it dies, but root rot is often irreversible No data.

High humidity during flowering Dense canopies trap moisture, creating ideal conditions for powdery mildew and gray mold (botrytis). Keep relative humidity at 40–55% during flowering. Use a dehumidifier if ambient humidity is high. Poor airflow worsens the problem Anecdote.

Excessive nitrogen in late flowering High nitrogen applied late in bloom can interfere with nutrient balance and prolong the flowering cycle. Use lower-nitrogen or zero-nitrogen formulas from week 6 onward No data.

Weak air circulation Stagnant air promotes mildew and uneven bud development. Use oscillating fans to move air throughout the canopy; never aim fans directly at buds, which can cause leaf bruising No data.

Over-pruning or aggressive defoliation Removing more than 30% of canopy mass at one time stresses the plant and reduces yield. GG4 can recover from moderate defoliation, but heavy cutting early in flower risks stunting Weak / limited.

Harvesting too early Impatient growers sometimes cut when trichomes are still mostly clear. Waiting for 50–70% milky white trichomes yields higher potency and dry weight Weak / limited.

Neglecting pH GG4 thrives at pH 6.0–6.5 in soil or 5.5–6.0 in hydroponic systems. Outside this range, nutrient lockout occurs and growth stalls Strong evidence^[2]. Test and adjust pH regularly using a calibrated meter.

Related Techniques

Screen of Green (SCROG) GG4's horizontal branching makes it ideal for SCROG setups. Weave branches horizontally under a mesh screen during the vegetative phase; once flowering is initiated, the canopy fills the net evenly. This technique increases light interception and can yield 15–25% more bud than unstaked plants in the same footprint Weak / limited. See Growing Headband with SCROG for detailed technique.

Low-stress training (LST) Gently bend and tie branches outward during vegetative growth to widen the plant's footprint and reduce apical dominance. GG4 responds well with no shock or stunting Anecdote. This pairs well with SCROG or is used alone in limited-space setups.

Supplemental CO₂ In sealed indoor rooms, raising CO₂ concentration to 1000–1500 ppm during light hours can increase photosynthesis and yields. However, this requires precise monitoring, proper ventilation equipment, and safety measures (CO₂ is an asphyxiant). Results vary by light intensity, temperature, and humidity; general plant research suggests potential 10–20% yield gains, but strain-specific data for GG4 is limited Weak / limited^[3].

Defoliation during flowering Removing 20–30% of shade leaves in weeks 5–7 improves light penetration to lower bud sites. GG4's density makes this worthwhile. Avoid defoliation in the final 2 weeks, as stress may reduce cannabinoid and terpene production Weak / limited.

Rosin pressing (solventless concentrate) GG4's high trichome density makes it an excellent candidate for rosin pressing—a solventless extraction method that uses heat and pressure to yield concentrate. Fresh-frozen flower typically produces rosin, though exact yields depend on starting material moisture, trichome maturity, and pressing parameters Anecdote. See Gorilla Glue #4 for concentrate strain overview.

Sources

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