The first step of making canna honey is called decarboxylation ("decarbing"). Without this, you're simply adding plant matter to honey and you won't feel high! To decarb, preheat your oven to 240F. Line a baking sheet with parchment paper then spread your cannabis trimmings in a thin layer on top. Bake for 40-60 minutes, stirring occasionally.
Once the trimmings are decarbed, lay out a piece of cheesecloth and put them on top. Fold the cheesecloth and tie off the corners with a string. Trim off any excess cloth or string to form a small bag. Add the bag to the glass jar then pour the honey on top.
Place a folded dishtowel on the bottom of the crockpot and put the jar on top of it. Fill the pot until the jar is ¾ submerged in the water. Cover and set the slow cooker to low (200F).
Cook the honey for 8 hours. Slightly shake the jar every couple of hours to help decrease any built-up pressure.
With oven mitts, carefully remove the jar from the slow cooker. Using tweezers, remove the trimmings bag and strain the honey from the bag into a new jar. Once the rest of the honey cools more, transfer to the new jar as well.
Store in a cool, dark place (50-70F).