TL;DR:
How is THCa flower made, and why does it feel so similar to traditional cannabis? This guide explains how growers cultivate and process hemp flower to maximize THCa content while staying federally legal, and why heating THCa changes its effects.
- THCa (tetrahydrocannabinolic acid) is a naturally occurring, non-psychoactive cannabinoid found in hemp and cannabis plants.
- THCa flower is typically made by growing specially bred hemp plants with naturally high THCa levels, not by spraying cannabinoids onto flower.
- Growers carefully time harvesting and processing to keep Delta 9 THC below the 0.3% federal legal limit.
- When THCa is heated through smoking, vaping, or cooking, it converts into Delta 9 THC, producing effects nearly identical to cannabis.
- Although federally legal as hemp, THCa flower can still trigger a positive drug test due to THC metabolites created after heating.
THCa flower has quickly become a popular option for cannabinoid connoisseurs. Why? Because it offers effects that are almost exactly the same as Delta 9 THC, but with federally legal hemp flower.
If you’re not familiar with THCa flower, you’re probably wondering how that can be. How is THCa flower made, and how can it be so similar to Delta 9?
Keep reading to learn more about THCa flower and how this unique product is grown and processed. We’ll explain how it can be so similar to, yet legally distinct from, Delta 9 and cannabis flower.
How THCa Flower is Made and What it Is
Understanding THCa: The Basics
THCa is the common name for tetrahydrocannabinolic acid, a chemical found in cannabis and hemp plants. Raw THCa is a non-psychoactive cannabinoid, similar to CBD and CBG.
THCa in this form doesn’t cause a high for users. However, Leafwell explains that it may have functional benefits, such as reducing inflammation and supporting brain health.
What makes THCa so popular is that it converts into Delta 9 THC, the main cannabinoid found in cannabis plant, when it’s heated or dried. Cannabis growers dry and cure their plants in part to encourage the conversion of THCa into THC. In chemistry terms, THCa is the precursor to THC.
Drying and curing aren’t the only ways to cause this chemical conversion. Heating THCa – such as by smoking, vaping, or making edibles with THCa flower – turns it into THC as well. That means hemp flower containing THCa can provide an almost identical experience to cannabis flower, with the added benefit of being federally legal (as of early 2026).
How THCa is Made
Hemp-derived THCa can come from two sources. When it comes to the products sold in stores and online, THC-a is made by:
- Chemical conversion of a plentiful cannabinoid found in hemp, such as CBD, into THCa.
- Growing hemp plants that, through breeding and careful management during cultivation, have high THCa content.
Most, although not all, THCa comes from hemp plants directly as opposed to being created in a lab. This is in contrast to many other cannabinoids, such as Delta 8 and THC-P, which only occur naturally in very small amounts.
Hemp cultivators measure THCa levels of their plants, selectively breed them to produce higher THCa levels, and time harvests to maximize THCa content and minimize THC content.
Growers then carefully process plants to provide a federally legal final product. Under the 2018 Farm Bill, hemp containing no more than 0.3% Delta 9 THC by dry weight is federally legal, as law firm Vicente LLP reminds us.
FAQs About THCa
Is THCa natural or synthetic?
THCa can be created through natural means as well as synthetic means. THCa that comes from hemp plants carefully grown and processed to maximize THCa content is natural THCa. THCa created in a lab by chemically converting another cannabinoid into THCa is synthetic.
Of the two, natural THCa is far more common in consumer products. You might occasionally find synthetic THCa products available from retailers, but the vast majority of THCa flower, vapes, and other products are made with naturally grown hemp.
Is THCa bud just regular bud?
Hemp THCa bud – flower that’s been harvested, processed, and is ready to smoke or vape – is different than “regular” bud, whether that means cannabis bud or other types of hemp bud.
Hemp THCa bud contains naturally grown THCa, while most other types of hemp bud contain cannabinoids that are chemically converted in a lab and applied to the flower. Cannabis bud contains naturally grown THC, meaning the THCa that was present has been changed into THC through drying and curing. So, THCa bud is unique compared to these other options.
Can THCa flower be detected in drug tests?
Standard drug tests can detect use of THCa flower because these tests look for evidence of use. The body produces a metabolite (a byproduct) when a user consumes psychoactive cannabinoids. Most drug tests identify this metabolite, and those viewing the results consider a positive result as evidence of cannabis use. Unfortunately, that’s true even when the source is something federally legal, like hemp-based THCa.
Is THCa flower sprayed?
No, most THCa flower is made by growing hemp that has high THCa levels and carefully harvesting and processing it to avoid exceeding federal limits on THC content. Although many other types of federally legal hemp flower are made by spraying lab-created cannabinoids onto flower, THCa flower is an exception. Some THCa flower is sprayed, but this is a rare situation and is not the standard experience for consumers buying THCa flower.
Will THCa get you stoned?
Raw THCa does not cause a high – taking it won’t lead to feelings like relaxation or an enhanced sense of creativity. However, heating and drying THCa causes it to change into Delta 9 THC.
So, smoking or vaping THCa, along with making edibles using THCa flower or concentrates, converts the THCa into THC, and will cause a high identical to the one that comes from using cannabis. To put it simply, THCa will definitely get you stoned when you smoke or vape it.
How long does a THCa high last?
THCa consumed in its raw form doesn’t cause a high, but heating THCa converts it into Delta 9 THC. That means users who vape or smoke THCa, for example, can expect a high that’s the same as what cannabis offers. That means a high that starts to take effect within seconds or a few minutes, feelings like relaxation and euphoria, and an experience that lasts somewhere between 90 minutes and a few hours.
Exceptional THCa Flower at Delta 8 Resellers
Delta 8 Resellers works with leading industry brands to deliver the very best THCa flower directly to your doorstep. Whenever available, you’ll find the results of independent lab testing for our THCa flower on individual product pages. That makes it easy to check out product quality, purity, and potency for yourself.
