Lushgaiaanswered grow question 2 years ago Personally I’d top it first and wait till it’s at least 4 weeks old before I do any lst, Topping is effectively used to obtain multiple, even-sized floral sites, while LST is then used to bring these floral sites to the same height to maximize grow lamp efficiency. by the looks of things this girl is gonna be in need of nutes soon hope this helps