Topping and FIMing
Topping and FIMing are two high-stress training techniques that redirect a plant's energy from one dominant cola to multiple equal-sized colas, dramatically increasing yield potential.
Topping
Topping involves cutting off the very top growing tip of the main stem. This removes apical dominance — the hormonal signal that keeps the central cola growing fastest. The plant responds by sending energy to the two next-highest shoots, which grow into two new main colas. Topped again, those two become four. Most growers top once or twice to create 4–8 main colas.
When to Top
Top when the plant has 4–6 nodes and is growing vigorously. Do not top sick, stressed, or recently transplanted plants. The plant needs 7–10 days to recover from topping — factor this into your timeline, especially if growing in a limited space. Do not top autoflowering plants — their compressed timeline does not allow adequate recovery time.
FIMing
FIM (stands for "F**k I Missed") is done by pinching or cutting 75% of the newest shoot rather than removing it entirely. This often produces 3–4 new tops instead of 2. It causes less stress than a full top but is less predictable. Combine FIMing with LST for best results.
Recovery and Growth
After topping, growth pauses for 3–5 days then accelerates as new shoots develop. The plant will look stunted briefly — this is normal. Increase light slightly after topping to support recovery. Do not add extra nutrients during the recovery period.
Quick Tips
- Use sharp, sterile scissors or a razor blade — dull cuts leave ragged wounds that take longer to heal.
- Wipe your cutting tool with isopropyl alcohol before and after topping to prevent disease transmission.
- Do not top within 2 weeks of flipping to flower — there is not enough time to recover.