A high-stress training technique where the apical (main) growing tip of a plant is cut, forcing the plant to redirect growth energy into two or more lateral branches, creating a bushier structure.
Mr. Q advised against topping the stressed CO2 room plants while they were still recovering, saying not to 'apply extra stress.' By the end of the episode (veg day 20), Dakota proceeded to top the taller plants like Mr. Stinky to even out the canopy before installing the SCROG net, while leaving the shorter Mac 10s untopped.