LST or also hard stress training will work as well, HST is when you take the main cola or colas, and strap them down . Here is Jason demonstrating Hard stress trianing,

YouTube - Hard Stress Training a 7ft Cannabis Plant.mpg
MadSativa Reviewed by MadSativa on . 2 weeks into flowering running out of space. Topping? Im 2 weeks into flowering and only have about a foot left in my tent. Would I lose yield if I topped them now?? Is this the only option?? Rating: 5