fimming a plant after it is outside wont increase yield, because your plant will be stunted for a week or two from the damage you did to the growth tips. also after having plants repeatedly chewed downby woodchucks, and regrown, i have found that having too many growth tips will severely slow down the growth of the plant. i ended up trimming of 3/4 ths of growth shoots one year just to get the plant to start growing upwards! Think about this, marijuana has been around for millions of years, and through the course of natraul selection and whatnot, they have evolved in the same way almost all other shrubs and some trees grow, in the "christmas tree" shape, this is because it offers the best light to all the leaves, and the fastest growth, as to overgrow any competition, among many other smaller factors. if a plant grows the best structor out of a field of plants, it will grow the tallest, make the most buds, capture the most pollen and realease the most seeds, eventually over many seasons that phenotype could take over the field. nature always finds the most effecient way, though it can take hundreds of thousands of seasons to get that way. many people find they get the best yield by embracing some of those natraly evolved traits, after all who but the plant knows the best way to survive?