Training methods are almost always explained without context online. One article shows LST, another SCROG, a third topping — but rarely is it explained which method is actually useful for which situation, and what happens when you choose the wrong one or apply it at the wrong time.
This article focuses on compact setups around 40×40 cm — the dimension of the Growix Core. The logic applies analogously to 60×60 cm, but many recommendations are specifically tailored to limited space.
Why Train — The Physical Basis
Untrained cannabis plants grow with apical dominance: the main shoot tip produces auxin, which inhibits the growth of lateral shoots. The result is a plant with one dominant main shoot and underdeveloped laterals — suboptimal for yield and light use in a closed grow system. Training interrupts this apical dominance mechanically (bending, LST) or by removing the meristems (topping, FIM).
Four Methods Compared
| Method | Difficulty | Yield potential | Risk | Recovery | Compact setup |
|---|---|---|---|---|---|
| LST | Easy | Medium–High | Very low | None | Highly recommended |
| Topping | Medium | High | Medium (stress) | 5–10 days | Recommended with time |
| FIM | Medium | Medium–High | Medium | 4–7 days | Conditionally recommended |
| SCROG | High | Very high | Low (if correct) | None | Optimal for 40×40 cm |
LST — Low Stress Training
LST is the lowest-risk method and the right choice for first grows or with genetics of unknown stress behaviour. The main shoot is bent horizontally and fixed with wire or a clip. Lateral shoots receive more light as a result and catch up.
LST in veg — concrete plan (first 3 weeks)
- Week 1: Bend only when the 4th–5th node section is visible. Gently bend main shoot outward 45–60°. Fix with soft wire at pot edge.
- Week 2: Bend new shoot tip again once 5–7 cm has grown. Fix lateral shoots catching up if needed. Goal: all shoot tips at the same height.
- Week 3: Continuous LST — regularly bend new shoots, keep canopy open. Remove lower leaves that receive no light.
SCROG in the Growix Core
The Growix Core uses a height-adjustable SCROG grid on dedicated mounting rails. Grid height: 25–35 cm above substrate surface. Mesh size: 5×5 cm recommended for compact genetics. Flip when 70–80% of grid area is filled — not 100%.