Topping

Topping is one of the most widely used training techniques in cannabis cultivation because it directly increases yield by transforming a single-cola plant into a multi-cola bush. The technique exploits a hormone called auxin, which is produced at the apical meristem (the top growing tip) and suppresses growth of side branches — keeping the plant pyramid-shaped with one dominant top. When the apical tip is removed via topping, auxin production stops at that location and the two side shoots immediately below the cut take over as new dominant tips. The plant continues this branching pattern: a single top topping creates 2 colas, topping each of those creates 4 colas, and a third round produces 8 colas. Standard topping protocol: wait until the plant has 4-6 nodes of vegetative growth, use clean sharp scissors or a razor to cut the main stem cleanly just above the 4th or 5th node, leaving 2-3mm of stem above the node. The plant will recover within 3-5 days and resume vigorous growth. Topping should only be performed during vegetative growth — topping during flowering causes severe yield loss. Multiple toppings (mainlining technique) can produce 8, 16, or even 32 evenly-sized colas suitable for SCROG-style canopy management. Autoflowers can be topped but require careful timing (only before week 4 of life) since they cannot recover in time if topped during flowering. Topping reduces total plant height by 10-20% compared to untopped plants but increases canopy width and yield significantly.