DISCLAIMER: Cannabis cultivation is illegal in many jurisdictions. This content is provided for educational purposes only. Always research and comply with your local laws and regulations before cultivating cannabis.
¶ Advanced Cultivation Techniques
This page covers advanced cultivation techniques that build on the foundational training methods described in Plant Training. Where the training page introduces topping, FIMing, LST, ScrOG, SOG, and basic defoliation, this page focuses on advanced protocols, technique combinations, and yield optimization strategies for growers who have already mastered the fundamentals.
Prerequisite: These techniques assume you can already identify plant health, diagnose nutrient issues, and perform basic LST and topping. If you are new to training, start with the Plant Training Guide before attempting these methods.
¶ Monster Cropping (Re-Vegging)
Monster cropping is a two-part technique that exploits cannabis's ability to re-vegetate after being forced into flowering. The process produces unusually bushy plants with multiple growth sites, making it ideal for SOG setups or mother plant regeneration.
¶ The Principle
When a photoperiod cannabis plant is switched from 12/12 (flowering) back to 18/6 (vegetative), it often produces abnormal growth characterized by:
- Single-blade leaves (instead of the normal multi-finger fan)
- Multiple branching points from a single node
- Rounded, thick stems
- Slower initial growth followed by explosive vegetative expansion
This is called "re-vegging" or "monstering" — the plant resets its hormonal balance and produces multiple dominant growth sites instead of a single apical cola.
¶ Monster Cropping Protocol
Phase 1: Flower for 2-4 Weeks
Allow the plant to flower under 12/12 lighting for 2-4 weeks. The plant should have established pre-flowers (pistils or pollen sacs) but not developed significant bud structure.
Phase 2: Switch Back to 18/6
Return the plant to 18/6 vegetative lighting. The plant will stop flower development and begin producing single-blade, deformed leaves at the growth tips.
Phase 3: Hard Prune (Day 7-14 of re-veg)
Once new vegetative growth is visible, cut the plant back to 2-4 nodes. This forces the plant to direct all energy into the remaining nodes, producing 2-4 main branches instead of one.
| Timing | Action | Expected Result |
|---|---|---|
| Week 1-2 of re-veg | Single-blade leaves appear; growth is slow | Normal — the plant is resetting hormones |
| Week 3-4 of re-veg | Multi-finger leaves return; multiple branches emerge | The "monster" effect — 2-4 dominant growth sites |
| Week 5-6 of re-veg | Rapid vegetative growth; thick, rounded stems | Plant is fully re-vegged and ready for training |
Phase 4: Train and Flower
Once the plant has established strong vegetative growth (typically 4-6 weeks after the light switch), apply LST or topping as desired, then flip back to 12/12 for flowering.
¶ When to Use Monster Cropping
| Scenario | Benefit | Trade-off |
|---|---|---|
| Creating a mother plant | Produces multiple strong branches for clone production | Takes 6-8 weeks from flower switch to usable mother |
| SOG setup from few plants | One plant produces 4-8 main colas instead of 1 | Adds 4-6 weeks to total grow time |
| Saving a plant that flowered too early | Re-vegetate accidentally flipped plants | Recovery takes time; yield may be reduced |
| Maximizing clones from one plant | Each monster branch can be topped independently | Hormonal irregularity can affect clone rooting |
Note: Monster cropping is not recommended for novice growers. The re-vegging phase is stressful and some plants do not recover well. Autoflowering strains cannot be monster cropped — they flower based on age, not light cycle.
¶ Advanced SCROG (Screen of Green)
The training page introduces ScrOG as a concept. This section covers the complete advanced protocol for maximizing yield per square foot.
¶ Screen Setup
| Parameter | Specification |
|---|---|
| Net type | Trellis net (plastic mesh) or wire grid |
| Mesh size | 4×4 inch (10×10 cm) squares |
| Height above medium | 12-18 inches (30-45 cm) for photoperiod; 8-12 inches (20-30 cm) for autoflowers |
| Tension | Taut — the net should not sag when branches are woven through it |
| Support | Frame or stakes at all four corners; additional center support for nets larger than 4×4 feet |
¶ Weaving Protocol
The goal of SCROG weaving is to create a flat, even canopy where every bud site receives direct light.
Week 1 of Vegetative (after topping):
- Install the trellis net at the target height
- As branches grow upward, gently bend them horizontally and thread them through the net
- Each branch should occupy one square of the mesh
- Secure branches with soft plant ties or garden wire if they resist bending
Week 2-3 of Vegetative:
- New growth emerges from the nodes of bent branches
- Continue weaving these new branches through adjacent squares
- Target: fill 60-70% of the net squares with a branch
- Remove any growth that extends below the net (these sites receive insufficient light)
Week 4 of Vegetative / Pre-Flip:
- Target canopy: 80-90% of net squares filled
- Remove small, shaded growth sites that will not produce meaningful colas
- Final check: the canopy should be flat and even, within 2-3 inches (5-8 cm) of the net surface
Week 1-2 of Flowering (Stretch Phase):
- Plants will stretch 1.5-2.5× their pre-flip height
- Continue gentle tucking of upward-growing colas back under the net
- By the end of week 2, the canopy should have risen 6-12 inches above the net
- Stop tucking after week 2 — the stems are hardening and will snap
¶ SCROG Yield Expectations
| Canopy Size | Net Squares (4×4 inch) | Filled Squares (80%) | Expected Yield (Indica-Dominant) | Expected Yield (Sativa-Dominant) |
|---|---|---|---|---|
| 2×2 ft | 36 | 28-30 | 100-200g | 150-250g |
| 3×3 ft | 81 | 64-68 | 250-400g | 350-550g |
| 4×4 ft | 144 | 115-120 | 400-600g | 550-800g |
| 4×8 ft | 288 | 230-240 | 800-1,200g | 1,100-1,600g |
Yield depends on: strain genetics, light intensity (PPFD at canopy), nutrient management, and grower experience. These figures assume 600-900 PPFD at canopy, proper VPD, and experienced cultivation. For strain-specific yield data, see the Strain Database.
¶ SCROG vs. SOG: When to Use Each
| Factor | SCROG | SOG |
|---|---|---|
| Plant count | 1-4 plants | 16-40+ plants |
| Vegetative time | 4-8 weeks (to fill the net) | 0-2 weeks (minimal veg) |
| Training required | Extensive (daily weaving) | Minimal (maybe one top) |
| Yield per plant | High (many colas per plant) | Low (one main cola per plant) |
| Yield per square foot | High | Very High |
| Legal plant limits | Ideal for 1-4 plant limits | Not suitable for plant-limited jurisdictions |
| Best for | Home growers with plant limits | Commercial growers with no plant limits |
| Strain selection | Any; indica-dominant fill nets faster | Uniform, short strains; clones preferred |
¶ Schwazzing (Heavy Defoliation Protocol)
The training page covers basic defoliation. Schwazzing is an aggressive, scheduled defoliation protocol designed to maximize light penetration and airflow in a dense SCROG or multi-cola canopy.
¶ The Principle
Schwazzing removes large fan leaves and secondary growth sites at three strategic points during the grow. The goal is to redirect the plant's energy from leaf production to flower production while creating an open canopy that allows light to reach lower bud sites.
Warning: Schwazzing is a high-stress technique. It should only be performed on healthy, vigorously growing plants. Do not Schwazz plants that are nutrient-deficient, pest-stressed, or underperforming.
¶ The Three Defoliation Events
| Event | Timing | What to Remove | Expected Impact |
|---|---|---|---|
| Event 1: Pre-Flip | 1-3 days before switching to 12/12 | All fan leaves blocking primary bud sites; all growth below the top canopy; any crossing or overlapping branches | 3-5 day recovery; plant directs energy to stretch sites |
| Event 2: Day 21 of Flower | End of stretch phase (approximately 3 weeks after flip) | New fan leaves that have emerged during stretch; any bud sites too small to produce meaningful colas ("popcorn" sites); lower growth receiving <200 PPFD | 2-3 day recovery; flowers begin to bulk |
| Event 3: Not Recommended | Beyond day 21 | Minimal — only remove leaves that are clearly blocking light to developing colas | Additional defoliation beyond day 21 provides diminishing returns and risks stressing the plant during critical flower development |
¶ What to Remove at Each Event
Remove:
- Large fan leaves that shade bud sites (prioritize leaves blocking direct light from your light source)
- Growth sites below the primary canopy (these receive insufficient light and produce airy, low-density "popcorn" buds)
- Crossing or rubbing branches (creates wound sites that can harbor pathogens)
- Yellowing or damaged leaves (the plant is already abandoning these)
- Suckers and watersprouts (weak growth from the lower stem)
Leave:
- Fan leaves that are not shading bud sites (these are the plant's photosynthetic engines)
- All healthy bud sites in the primary canopy
- New growth at the very top of the canopy (these are your main colas)
- Any leaves that show the plant is still actively photosynthesizing (deep green, turgid)
¶ Light Defoliation vs. Schwazzing
| Aspect | Light Defoliation | Schwazzing |
|---|---|---|
| Leaf removal | 10-20% of total leaf area | 30-50% of total leaf area |
| Timing | As needed throughout grow | Three scheduled events |
| Stress level | Low | High |
| Recovery time | 1-2 days | 3-5 days |
| Best for | All growers; maintenance | Experienced growers; dense canopies; SCROG setups |
| Risk | Minimal | Significant if performed on unhealthy plants |
Rule of thumb: If you are unsure whether to Schwazz, start with light defoliation. You can always remove more leaves later, but you cannot put them back.
¶ Multi-Layer Trellis Systems
Single-layer SCROG nets work well for most home grows. Multi-layer trellis systems add vertical support and canopy management for tall plants and heavy colas.
¶ Two-Layer Trellis Setup
| Layer | Height | Purpose |
|---|---|---|
| Lower net | 12 inches (30 cm) above medium | Supports lower branches; creates a secondary canopy |
| Upper net | 24-30 inches (60-75 cm) above medium | Supports primary colas; prevents branch breakage under flower weight |
Installation:
- Install the lower net during early vegetative growth (week 2-3)
- Weave branches through the lower net using standard SCROG technique
- As branches grow through the lower net and reach the upper level, install the upper net
- Weave the upper growth through the upper net during late vegetative growth
Benefits:
- Doubles the effective canopy area without increasing footprint
- Provides structural support for heavy colas (reduces branch breakage in week 6-8 of flower)
- Creates two distinct canopy layers, each receiving different light intensities (lower layer receives 50-70% of upper layer PPFD)
Trade-offs:
- Requires taller grow space (minimum 6 feet / 180 cm ceiling height)
- Increases humidity in the space (more leaf area = more transpiration)
- More complex to manage — requires monitoring both canopy layers for pests and disease
¶ Three-Layer Trellis (Commercial)
| Layer | Height | Use Case |
|---|---|---|
| Layer 1 | 12 inches (30 cm) | Lower canopy; secondary colas |
| Layer 2 | 24 inches (60 cm) | Primary canopy |
| Layer 3 | 36-42 inches (90-105 cm) | Top support; heavy cola prevention |
Three-layer systems are primarily used in commercial operations with ceiling heights of 8+ feet (240+ cm). For home growers, a two-layer system is the practical maximum.
¶ Air Pruning and Root Management
Root zone management is often overlooked but directly affects above-ground plant vigor, nutrient uptake, and stress tolerance during training.
¶ What Is Air Pruning?
Air pruning occurs when root tips reach the edge of a container and are exposed to air. The root tip desiccates and dies, which triggers the plant to produce multiple lateral roots behind the pruned tip. This creates a denser, more fibrous root system that absorbs nutrients more efficiently than roots that circle the container.
| Container Type | Air Pruning | Root Structure | Transplant Shock |
|---|---|---|---|
| Fabric pot | Excellent | Dense, fibrous lateral roots | Minimal |
| Air pot (ridged walls) | Excellent | Dense, fibrous lateral roots | Minimal |
| Plastic pot (smooth walls) | None | Roots circle the container; root-bound | Significant |
| Smart pot (geotextile) | Good | Moderate lateral root development | Low |
| Coco coir block (seedling) | Partial | Moderate; roots reach edges quickly | Low |
¶ Root Pruning (Manual)
Root pruning is the practice of trimming circling or overgrown roots during transplant to encourage new lateral root growth.
When to Root Prune:
- Transplanting from a smaller to larger container
- Roots have become root-bound (circling the container)
- Root rot has affected a portion of the root system (remove affected tissue)
How to Root Prune:
- Remove the plant from its container
- Use sterilized scissors or pruning shears
- Trim 1-2 inches (2-5 cm) from the bottom and sides of the root ball
- Remove any brown, mushy, or dead roots
- Immediately transplant into the new container with fresh medium
- Water with a root stimulator (seaweed extract, mycorrhizae, or vitamin B1)
| Root Pruning Severity | Amount Removed | Recovery Time | Best For |
|---|---|---|---|
| Light | Bottom 1 inch only | 3-5 days | Routine transplanting; healthy plants |
| Moderate | Bottom and sides, 1-2 inches | 5-7 days | Root-bound plants; mid-grow container upgrade |
| Aggressive | Up to 25% of root mass | 7-14 days | Root rot recovery; severely root-bound plants |
Warning: Root pruning is a high-stress procedure. Do not root prune during flowering. The plant needs its root system to support flower development. Only root prune during vegetative growth, and allow at least 1 week of recovery before flipping to 12/12.
¶ Mycorrhizal Inoculation
Mycorrhizal fungi form symbiotic relationships with cannabis roots, extending the root system's effective reach by 100-1,000× through fungal hyphae networks.
| Benefit | Mechanism |
|---|---|
| Increased nutrient uptake | Hyphae access phosphorus, zinc, and copper beyond the root zone |
| Improved drought tolerance | Hyphal networks retain and transport water |
| Disease resistance | Mycorrhizae compete with root pathogens (Pythium, Fusarium) |
| Reduced fertilizer requirement | More efficient nutrient extraction from the medium |
Application:
- Apply at germination or transplanting (directly to the seed hole or root zone)
- Do not apply to established plants — the fungi need young, growing roots to colonize
- Avoid chemical fungicides and hydrogen peroxide drenches after application — these kill mycorrhizae
¶ Advanced Supercropping Protocol
The training page introduces basic supercropping (bending stems until the inner tissue cracks). This section covers advanced applications for canopy management.
¶ Multi-Bend Supercropping
Standard supercropping involves one bend per stem. Multi-bend supercropping creates a cascading canopy where each bent stem produces multiple secondary branches.
Protocol:
- Identify the tallest branches in the canopy
- Pinch and bend the stem at the node below the growing tip until you feel the inner tissue crack (the stem will hinge at the bend point)
- Bend the stem to a 90-degree angle and secure it
- Wait 5-7 days for the stem to heal and form a knuckle at the bend
- On the newly horizontal stem, identify the next node down and repeat the bend
- Each bend creates a new growth point; a single stem can support 2-3 bends
| Bend Number | Timing | Effect |
|---|---|---|
| 1st bend | Week 3-4 of vegetative | Creates the primary horizontal branch |
| 2nd bend | 5-7 days after 1st bend heal | Creates a secondary growth site |
| 3rd bend | 5-7 days after 2nd bend heal | Creates a tertiary growth site (optional) |
¶ Pre-Flower Supercropping
Some advanced growers perform one final supercropping event 7-10 days before flipping to 12/12. This is controversial and should only be attempted by experienced growers.
Rationale: The stress triggers a hormonal response (increased auxin and cytokinin production) that may enhance flower site development during the stretch phase.
Risk: The plant enters the critical flower transition while recovering from stress. If the plant is not healthy, this can reduce yield rather than increase it.
| Factor | Recommendation |
|---|---|
| Plant health | Only on vigorous, dark-green, pest-free plants |
| Timing | 7-10 days before 12/12 flip; no later |
| Severity | Light bends only; do not crack stems |
| Nutrient support | Increase silicon and calcium 3 days before and after bending |
| Not recommended for | Autoflowers; plants in their first grow; stressed or deficient plants |
¶ Combining Techniques: Optimal Training Sequences
The most effective grows combine multiple techniques in a logical sequence. Below are proven training sequences for different grow scenarios.
¶ Scenario 1: Single Plant, Maximum Yield (SCROG + Topping + Defoliation)
| Week | Action | Recovery |
|---|---|---|
| Week 2 (veg) | Top at 4th node | 5-7 days |
| Week 3-4 (veg) | LST: weave branches through SCROG net | None (low-stress) |
| Week 4-5 (veg) | Supercrop any dominant branches that escape the net | 3-5 days |
| Week 6 (veg, 3 days before flip) | Event 1 defoliation: remove shading fan leaves and lower growth | 3-5 days |
| Week 6-7 | Switch to 12/12 | — |
| Week 8-9 (flower, stretch) | Tuck upward colas under the net | None |
| Week 10-11 (flower, day 21) | Event 2 defoliation: remove stretch-phase fan leaves and popcorn sites | 2-3 days |
| Week 11+ | No further training; monitor and maintain environment | — |
Expected result: 1 plant fills a 4×4 ft net with 80-120 colas, producing 400-600g in a 600-900 PPFD environment.
¶ Scenario 2: Plant-Limited Grow (4 Plants, LST + Light Defoliation)
| Week | Action | Recovery |
|---|---|---|
| Week 2 (veg) | Top each plant at 4th node | 5-7 days |
| Week 3-5 (veg) | LST: bend branches outward to fill the space | None |
| Week 5 (veg) | Light defoliation: remove only leaves blocking bud sites | 1-2 days |
| Week 6 | Switch to 12/12 | — |
| Week 8-9 (flower) | Light defoliation: remove only leaves shading primary colas | 1-2 days |
| Week 10+ | No further training | — |
Expected result: 4 plants producing 150-250g each, totaling 600-1,000g in a 4×4 ft space.
¶ Scenario 3: Mother Plant for Clone Production (Monster Cropping + Topping)
| Week | Action | Recovery |
|---|---|---|
| Week 1-3 | Flower a plant under 12/12 | — |
| Week 4 | Switch to 18/6 (re-veg) | — |
| Week 5-7 | Single-blade leaves; slow growth | — |
| Week 8-9 | Multi-finger leaves return; 4-6 branches emerge | — |
| Week 10 | Top each branch at 3rd node | 5-7 days |
| Week 11+ | Maintain under 18/6; take 3-5 cm cuttings every 10-14 days | — |
Expected result: One monster-cropped mother plant producing 4-6 strong branches, each capable of providing 3-5 cuttings per cycle. Approximately 15-30 clones every 2 weeks from a single mother.
¶ Training Recovery Protocol
Every high-stress technique requires a recovery period. Optimizing recovery minimizes growth pause and maximizes yield.
¶ Post-Training Nutrient Adjustments
| Nutrient | Adjustment | Reason |
|---|---|---|
| Nitrogen | Increase by 10-15% for 5-7 days after training | Supports new growth site development |
| Calcium | Maintain or increase slightly | Cell wall formation at wound sites (bend knuckles, cut sites) |
| Silicon (if available) | Add 10-30 ppm potassium silicate | Strengthens cell walls at stress points |
| Seaweed/Kelp extract | Apply at label rate | Contains cytokinins and auxins that promote recovery |
| Carbohydrates (molasses, sugars) | Apply at label rate | Feeds beneficial microbes that support root health during stress |
¶ Recovery Timeline by Technique
| Technique | Growth Pause | Full Recovery | When to Apply Next Technique |
|---|---|---|---|
| Topping | 3-5 days | 7-10 days | After new branches have 3-4 nodes |
| FIMing | 3-5 days | 7-10 days | After new growth is established |
| LST | None | Immediate | Anytime during vegetative growth |
| Supercropping | 3-5 days | 5-7 days (knuckle formation) | After knuckle has hardened |
| Defoliation (light) | 1-2 days | 3-4 days | After plant resumes normal growth |
| Defoliation (Schwazzing) | 3-5 days | 5-7 days | Not recommended again after day 21 of flower |
| Monster Cropping | 2-3 weeks | 4-6 weeks | After full vegetative recovery |
| Root Pruning | 5-7 days | 10-14 days | Not during flowering |
¶ Technique Selection Matrix
Choose techniques based on your grow scenario:
| Scenario | Recommended Techniques | Avoid |
|---|---|---|
| First grow | LST, single topping, light defoliation | Supercropping, monster cropping, Schwazzing |
| Small space (2×2 ft) | LST, ScrOG (single plant), light defoliation | SOG (too many plants), multi-layer trellis |
| Plant limit (1-4 plants) | SCROG, topping, multi-bend supercropping, monster cropping | SOG (requires many plants) |
| Commercial (no plant limit) | SOG, single topping, light defoliation | SCROG (too labor-intensive at scale), monster cropping |
| Autoflower | LST only, light defoliation | Topping, FIMing, supercropping, monster cropping, Schwazzing |
| Outdoor | Topping, LST, SCROG (with outdoor trellis), companion planting | Multi-layer trellis (wind risk) |
¶ Related Pages
- Plant Training — Foundational techniques: topping, FIMing, LST, basic ScrOG and SOG
- Indoor Grow Guide — Complete indoor grow with week-by-week schedule
- Outdoor Grow Guide — Complete outdoor grow with seasonal calendar
- Troubleshooting Guide — Diagnosing problems caused by improper training
- Nutrients & Feeding — Post-training nutrient adjustments
- Strains Database — Strain-specific growth characteristics and training response
- Pest & Disease Management — IPM strategies for dense canopies
- Environmental Control — VPD and airflow in trained canopies
See Also: /cultivation/training | /cultivation/indoor/grow-guide | /cultivation/outdoor/grow-guide | /cultivation/troubleshooting | /cultivation/nutrients | /strains