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COA explainer · United States

California: from farm to shelf, what ends up on the package

Play it: the batch moves through the workflow on the left, and each piece of required label info snaps onto the package on the right, color-coded by who adds it.

Sample data · California (DCC) label rules · for illustration

Published

🏷️ The product label, building live

WE-C · House Blend
Cannabis Flower
Fictional sample label for illustration, not a compliant, printable label.
🌱 Farm adds it🚚 Distributor adds it🔬 Lab / COA adds it🏪 Retailer adds it🏛️ Regulatory (always required)
The big idea: almost everything a customer relies on (the potency numbers, the COA QR, the "tested by" line) is added at the lab step, not by the farm or the store. The farm supplies identity (UID, batch, who grew it), the distributor supplies packaging + the regulatory warnings, the lab supplies the proof, and the retailer just adds the point-of-sale layer. The UID QR ties the physical package back to the 1A4 track-and-trace record; the COA QR opens the lab results; a store QR is an optional marketing add-on.

Sample data for illustration only. Label content, warning text and the universal symbol are approximations of California's DCC rules; real packaging must use the official artwork and current regulations.

Step by step: California

  1. Step 1: Cultivator / Farm (Farm) Farm creates the batch and tags it in Metrc. On the label this becomes the UID, batch/lot number, cultivator name + license, harvest date, and net weight, plus the UID QR.
  2. Step 2: Distributor + packaging (Distributor) Distributor takes possession and packages it. The label gains the packaged-by line + distributor license, the packaging date, the universal cannabis symbol, and the government/Prop-65 warning.
  3. Step 3: Lab sampling (Lab) A licensed lab pulls a representative sample at the distributor's premises. Nothing is printed yet: the results don't exist until analysis is done.
  4. Step 4: Lab analysis (Lab) The lab runs potency + the full contaminant panel. Results are being generated, still nothing on the label until the COA is finalized.
  5. Step 5: COA issued (Lab) The lab issues the COA. This unlocks the label's headline data: THC & CBD content, the tested-by line + lab license + test date, and the COA QR that opens the full results.
  6. Step 6: Pass / fail (Regulatory) Batch passes: the distributor's QA clears it and it's marked ready for sale. (A fail would pull everything back for destruction or remediation + re-test.)
  7. Step 7: Retailer / dispensary (Retailer) The dispensary receives it with a passing COA already attached. It adds the sold-by line, the point-of-sale price/tax (exit label), and often an optional store menu QR.
  8. Step 8: Consumer (Retailer) The finished label is complete. The buyer can scan the COA QR for lab-verified results or the UID QR to confirm it's a real, tracked package.

Frequently asked questions

Who tests cannabis in California?
An independent, licensed testing lab does the testing in California. It runs potency plus the full contaminant panel on a sample it pulled itself, then issues the Certificate of Analysis. That COA is what unlocks the label's THC and CBD numbers, the tested-by line with the lab license and test date, and the COA QR code.
Who pulls the sample in California?
In California a licensed lab pulls the representative sample, and it does so at the distributor's premises. The distributor drives the chain: it takes possession, packages the batch, arranges the lab sampling, and its quality assurance clears the pass before the product is marked ready for sale. Nothing is printed until the analysis is done.
What has to be on a cannabis label in California?
A California label carries identity from the farm (the UID track-and-trace tag, batch number, cultivator name and license, harvest date, net weight), the packaged-by and distributor license line, the universal cannabis symbol and government warning, the THC and CBD content with the tested-by line, and the sold-by line. A COA QR is optional.

Keep reading

How to read a cannabis label Terpene glossary Every COA explainer
Educational information only, not medical advice. Terpene and cannabinoid effects are an active area of research and vary by person, product, and dose. Cannabis is for adults 21+ where legal.

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