The marijuana fan leaves are the leaves that shade the lower cannabis buds on the plant and because of this the buds do not grow to their full potential. Removing or trimming these leaves will mean that the lower branches are able to get more light.
This means the buds are able to mature on these lower branches. Removing these cannabis leaves will also safe the energy the plant uses for upper bud development, to build the extra stem and to feed the upper part of the plant water.
What trimming the fan leaves does in effect is help the marijuana plant to produce a larger yield when it is harvested.
When the fan leaves are removed about fifteen days before harvest, it will speed up the flushing process of the marijuana plant.
Another thing that removing cannabis fan leaves does is to create better airflow, which means there is less chance of mold