You should not lollipop your marijuana plants after the first week of flowering, as this can cause more harm than good. Lollipopping too late can shock the plants and stunt their growth, reducing their yield and quality. It can also expose the buds to more light and heat, which can cause them to dry out and lose their flavor and aroma. Additionally, it can increase the chances of hermaphroditism, which is when a female plant develops male pollen sacs and pollinates itself or other plants, resulting in seeds.