First and foremost, it all starts with the initial quality of the biomass in question. If biomass starts out as a mediocre or sub-par product, chances are that by now it has degraded into nearly valueless material. Any existing biomass from either last season or even the season before MUST have started out as top-shelf material or it was never going to be bought up in the first place.
This means the material should have been grown in as relatively stress-free conditions as possible and should have been fertilized with organic materials that encourage vigor without affecting THC levels within the plant. They must have initially contained high levels of CBD or another desirable cannabinoid (above 10% at least) with easily compliant levels of THC for the state in which it is being brokered/sold. The biomass should have initially had an extremely pungent terpene profile, as this is usually the first desirable quality to go out the window. Proper paperwork is a must (obviously) and the more paperwork the biomass contains, the better! It is estimated that less than 5-10% of the biomass available now meets even these initial standards of quality, and that doesn’t even take into account the timing, drying and storage of the material.