Cannabis Waste Compost (Yard Trimmings) Cart Facility Drop-Off Cannabis businesses can drop off cannabis waste at the Napa Recycling & Composting Facility (fee is the same as that for yard trimmings) – you will receive a cannabis waste weight tag for your chain of custody requirements. Please remove non-compostable packaging and use compostable materials (yard trimmings, leaves, shredded paper, sawdust, etc.) when rendering it “unusable” for transportation. Vape pen batteries can cause dangerous fires when not disposed of properly – they must be recycled separately and never disposed of in the trash, recycling or compost. Only Cannabis Plant Parts Belong in the Compost Leaves, flowers, and other parts from a cannabis plant can be composted as long as they do not contain or are combined with any hazardous or toxic materials. Cannabis wrapped in a cigar wrapper, cigarette rolling paper, or any other toxic materials must be disposed of in the landfill. Did You Know? History of Cannabis in the United States Other than recreational use, cannabis (fibers) can also be made into a variety of products, from rope to cloth to paper. With its usefulness, cannabis was considered a proper form of currency in Virginia, Pennsylvania and Maryland. Read more here.