It refers to the removal of excess leaves from the marijuana buds either before or after drying them. Removing the extra leaf matter will significantly improve t se bud’s smoothness when smoking. Growers prefer to extract the trimmed leaves separately so that they don’t waste on any of the compounds. The leaves however have a much less THC concentration as compared to the real bud. Whether you use your hands or an automatic trimmer, proper trimming is vital to ensure the bud cures correctly for the optimal potency of the resulting trichomes.