Most of the THC in fresh flower exists as THCA, an acidic form that only becomes psychoactive THC when it is heated. Testing labs report both, and total THC is calculated by multiplying THCA by roughly 0.877 and adding any THC already present. A label that says 22% THCA and 1% THC is a total of about 20.3%, not 23%.

This matters because labelling rules differ between markets and some packages quote the raw numbers helpfully while others quote whichever figure looks more impressive. When you compare two products, compare like with like, and remember that a two-point difference within the same product category is well inside the noise of both your own tolerance and the lab's margin of error.

How strong a given flower feels depends on how much you use, how you consume it, how recently you last consumed, and your own tolerance — not just the number on the jar. A 16% flower smoked slowly in a small joint can hit harder than a 26% flower in a big loose one that burns off half its resin before you get to it.

Very high THC numbers also tend to come at the cost of everything else that makes flower interesting. Cultivars pushed toward maximum potency often test lower on aromatic compounds, and plenty of experienced smokers will choose a 17% flower with a loud terpene profile over a 30% one that smells like hay.

Terpenes are the aromatic compounds that give each cultivar its smell and, in combination with cannabinoids, a lot of its character. Myrcene reads earthy and herbal, limonene citrus, pinene sharp and piney, caryophyllene peppery, linalool floral, terpinolene complex and slightly herbal. A package that lists total terpenes above roughly 1.5% is telling you the flower was handled carefully enough to keep its aromatics, which is a better freshness signal than the THC number.

You do not need to memorise chemistry. Keep a note of the terpenes in batches you loved and the ones in batches you found dull, and you will start spotting patterns far faster than by chasing potency.

Look for a packaged-on date, and prefer the freshest you can find; flower loses aromatic quality long before it becomes unsmokeable. Harvest date is more useful still, but it is rarely printed. If neither is shown, that itself tells you something.

Indoor, outdoor and greenhouse flower are genuinely different products: indoor is more consistent and usually more expensive, outdoor carries more variation between batches and often a broader aromatic profile. Sun-grown is not automatically worse, and indoor is not automatically better — but the label should say which you are buying.

What is the packaged date? Which batch is this from? Do you have the terpene breakdown? Is there a smaller format of the same batch so I can try it first? A shop that can answer those questions is a shop worth returning to, and the answers tell you more than any percentage on the front of the package.