Is it advisable to prune or trim my marijuana plants?
Indoor marijuana plants tend to produce many branches prior to flowering. Each of these will produce a bud at some point. The resources of the plant, however, are stretched pretty thin. With trimming, you eliminate a few of the growing points, allowing the marijuana plant to put more energy into a smaller amount of branches. You’ll end up with fewer buds in the long run, but they will be of much higher quality.
Fan leaves that cast shadows on growing buds need to be excised so that the buds can receive an adequate amount of light.