Quick answer: THCA flower is made the same way as any quality cannabis: licensed hemp farms grow THCA-rich genetics, harvest when the trichomes are ripe, then dry, trim and cure the buds. The key difference is testing. Each crop is lab tested to confirm delta-9 THC is at or under 0.3% by dry weight, which has let it be sold as hemp.
There’s nothing synthetic about THCA flower. It is grown, not made in a lab. Here’s how it goes from seed to jar, and what changes with the federal rule that starts December 11, 2026.
How is THCA flower made, step by step?
- Genetics: farms start with strains known for heavy THCA production, from seed or from clones of proven mother plants.
- Vegetative growth: plants grow leaves and stems under long days, usually 18 hours of light.
- Flowering: shorter days (about 12 hours of light) trigger bud production. This is when THCA builds up in the trichomes.
- Pre-harvest testing: regulators test samples before harvest to confirm the crop fits the hemp rules.
- Harvest: plants are cut when trichomes are ripe.
- Drying: whole plants or branches hang in a cool, dark room.
- Trimming: leaves are removed to leave clean buds. The small pieces become shake.
- Curing: buds rest in sealed containers for weeks to develop flavor.
- Final lab testing: a third-party lab tests potency and safety, producing the COA.
How is THCA made in the plant?
The plant makes THCA on its own. It starts with CBGA, the “mother cannabinoid”. An enzyme called THCA synthase turns CBGA into THCA inside the trichomes. Strains bred for potency have more of this enzyme at work, which is why genetics matter so much. THCA only becomes THC later, when it’s heated. See What is THCA?
What are trichomes?
Trichomes are the tiny, mushroom-shaped glands that make cannabis look frosty. They hold almost all of the plant’s THCA and terpenes. Growers watch them closely with a magnifier:
- Clear trichomes: not ready yet.
- Cloudy (milky) trichomes: peak THCA. Most growers harvest when most trichomes look like this.
- Amber trichomes: past peak. THCA starts breaking down, and the effects are often described as heavier.
Trichomes are fragile, so careful handling during harvest, trimming and packing keeps more of them on the bud.
Drying THCA flower
After harvest, buds hold a lot of water. Drying slowly protects THCA and terpenes. Most growers aim for a dark room around 60°F to 65°F with about 60% humidity for one to two weeks. Small stems should snap, not bend, when the flower is ready. Dry too fast and the flower tastes harsh. Dry too slow and mold becomes a risk.
How to cure weed
Curing is what separates good flower from great flower. Dried buds go into airtight containers, filled about three-quarters full, and kept cool and dark. For the first week or two, the containers are opened briefly once or twice a day to let moisture out (“burping”). After that, less often. A cure lasts at least two weeks, and many growers go a month or longer. A good cure gives a smoother smoke, stronger smell and better flavor.
Lab testing and the 0.3% limit
Under the current federal rule, hemp must test at or under 0.3% delta-9 THC by dry weight. Licensed farms test before harvest, and finished flower is tested again by a third-party lab for potency and, often, for contaminants. Those reports are the COAs we post for every product on our lab results page.
What changes on December 11, 2026
Starting December 11, 2026, the federal hemp definition switches from delta-9 THC to total THC, which counts THCA. After that date, most THCA flower will no longer meet the federal hemp definition, no matter how carefully it is grown. Our Is THCA legal? guide covers the change and what it means by state.
Grown in the Pacific Northwest
Our flower comes from the Pacific Northwest, one of the best regions in the country for cannabis. The cool climate, long summer days and generations of grower know-how produce dense, terpene-rich buds. Orders ship from our warehouse in Albany, Oregon.
Can you grow THCA flower at home?
Growing hemp commercially requires a hemp license from your state or the USDA, and every crop has to pass testing. In states with legal home cannabis grows, you can grow cannabis for personal use under those state rules, but home-grown plants usually won’t stay within the hemp limit without testing. Check your state’s laws before you start.
FAQ
Is THCA flower made in a lab?
No. THCA flower is grown. Only concentrates like isolate are extracted, and they come from the plant too.
Is THCA flower sprayed?
Quality THCA flower isn’t sprayed to boost potency. See Is THCA flower sprayed or synthetic?
How long does it take to grow THCA flower?
Most strains take about three to five months from seed to harvest, plus two to six weeks to dry and cure.
Why does THCA % vary by batch?
Weather, harvest timing and curing all change the final numbers. That’s why each product has its own COA.
