By Greenhouse Girls | Palm Harbor & Oldsmar, FL
The Label Isn’t as Complicated as It Looks
Cannabis product labels can feel overwhelming the first time — percentages, milligrams, abbreviations, and acronyms stacked on top of each other. But once you understand what each number represents and which format it applies to, the whole thing clicks into place fast.
Here’s a plain-English guide to every number and term you’ll encounter on a cannabis product.
THCa % — The Most Important Number on Flower Labels
If you’re buying THCa flower or a pre-roll, THCa % is the number that matters most for predicting your experience.
THCa (tetrahydrocannabinolic acid) is the raw, non-psychoactive form of THC as it exists in the living and unheated cannabis plant. When you apply heat — by smoking, vaping, or dabbing — THCa converts to psychoactive Delta-9 THC through decarboxylation. The conversion ratio is approximately 0.877:1, meaning 24% THCa becomes roughly 21% active Delta-9 THC after heating. (Woodhaven Cannabis, 2026)
So when you see “THCa 26%” on a flower label, that’s telling you: this flower will deliver approximately 22–23% active THC once you smoke it.
What’s a good THCa percentage?
- 18–22% = Good quality, great for everyday use
- 22–28% = High potency
- 28%+ = Very high potency — experienced consumers only
Delta-9 THC % — The Legal Compliance Number
On a flower label, you’ll see a Delta-9 THC percentage that’s almost always below 1% — often as low as 0.1–0.3%.
This is not the potency number. This is the legal compliance number.
Delta-9 THC in unheated flower exists only in tiny amounts because most of it is still in the form of THCa. The 0.3% Delta-9 THC threshold is the federal legal limit that defines hemp under the 2018 Farm Bill. Products below this threshold are federally legal hemp. Products above it are classified as marijuana.
Don’t confuse a low Delta-9 THC % on flower with low potency. A flower showing 0.2% Delta-9 and 25% THCa is very potent — because the THCa converts upon heating. (Snapdragon Hemp, 2026)
mg per Serving — The Number That Matters on Edibles and Drinks
For gummies, edibles, and drinks, forget percentages. The number you care about is milligrams (mg) of THC per serving. (Authorized Dealer, 2026)
- 5–10mg = Beginner to moderate dose
- 25mg = Standard dose for regular consumers
- 50mg+ = High dose, experienced consumers only
Always check both “per serving” and “total per package.” A bag labeled “100mg total / 10 servings” contains 10mg per gummy. A bag labeled “100mg total / 4 servings” contains 25mg per gummy — very different experiences from the same total amount.
CBD % or mg — The Balance Cannabinoid
CBD (cannabidiol) is the non-psychoactive cannabinoid. On flower it shows as a percentage. On edibles and tinctures, it shows as milligrams.
CBD doesn’t produce a high but interacts with your endocannabinoid system to produce calming effects. In combination products, CBD modulates and balances the THC experience — smoothing the edges and reducing the risk of anxiety at higher THC doses. A 1:1 CBD to THC ratio tends to produce a very balanced, calming experience.
Terpene % — The Flavor and Experience Number
The terpene panel on a COA shows the aromatic compounds that give each strain its unique smell, flavor, and nuanced effects.
What to look for:
- Total terpene content above 1.5% = quality flower
- Total terpene content above 2% = exceptional
- Dominant terpene signals the experience: myrcene = relaxing/indica character, limonene = uplifting/sativa character, linalool = calming, caryophyllene = grounding
Not all COAs include a terpene panel — it’s an additional cost. If yours doesn’t have terpene data, look up your strain on Leafly.com for typical terpene profiles.
What ND Means
ND = Not Detected. You’ll see this on the safety panel of a COA next to pesticides, heavy metals, residual solvents, and microbials. ND means the substance was not found at or above the lab’s detection limit. For safety tests, ND across the board is exactly what you want to see.
Your Quick COA Checklist
Whether you’re buying flower, gummies, concentrates, or drinks:
✅ Batch number matches your product packaging
✅ THCa % matches the label claim (for flower)
✅ mg per serving matches the label claim (for edibles)
✅ Delta-9 THC under 0.3% (for flower)
✅ Pesticides: all ND or Pass
✅ Heavy metals: all ND or Pass
✅ Test date is recent
✅ Lab is a real, independent third-party
Every product we carry at Greenhouse Girls has a QR code on the packaging that links directly to the current batch COA.
Shop With Confidence
Palm Harbor: 37490 US Highway 19 N — Open daily 11AM–7PM
Oldsmar Flea Market: 180 N Racetrack Rd D-13 — Open Saturday & Sunday 9AM–3PM
Frequently Asked Questions
What does THCa % mean on a flower label?
THCa is the raw precursor to THC found in unheated cannabis. When you smoke it, it converts to Delta-9 THC. The THCa % is the best predictor of how potent the flower will be after smoking.
Why is the Delta-9 THC % so low on hemp flower?
Because Delta-9 THC forms only after heating. In unheated flower, almost all the THC exists as THCa. The low Delta-9 number is a legal compliance indicator — not a potency indicator.
What does mg mean on a gummy label?
Milligrams of active THC per serving. Always check per serving, not per package — the per-package number can be misleading if you’re not doing the math.
What is ND on a COA?
Not Detected — meaning the substance wasn’t found at or above the lab’s detection limit. For pesticides, heavy metals, and residual solvents, ND is exactly what you want.
Why do some COAs not have terpene data?
Terpene panel testing is an additional, more expensive test that smaller brands sometimes skip. Use Leafly.com to look up typical terpene profiles for your strain if the COA doesn’t include them.
Greenhouse Girls is a women-owned hemp retailer with over 1,000 five-star Google reviews, named Best Dispensary 2025 by Creative Loafing. All products are third-party lab tested. This post is for informational purposes only.
