Decarboxylation
The complete guide to activating cannabinoids with heat, time, and science
What Is Decarboxylation?
Decarboxylation, or “decarbing,” is the process of applying heat to cannabis to activate its compounds. Raw cannabis contains cannabinoid acids like THCA and CBDA, which aren’t psychoactive or as bioavailable on their own.
If you’ve ever wondered why eating raw flower doesn’t get you high but edibles do, decarboxylation is the reason.
The Chemistry Explained
Decarboxylation is a chemical reaction where a carboxylic acid group COOH is removed as carbon dioxide CO₂.
The Core Reaction
THCA + Heat → THC + CO₂
CBDA + Heat → CBD + CO₂
The reaction is time and temperature dependent. Too little heat and it stays inactive. Too much heat and you degrade THC into CBN or evaporate terpenes.
Why It Matters
Edibles
Without decarbing, your brownies or gummies will be weak. Decarbed material infuses properly into butter or oil.
Tinctures & Topicals
Alcohol and oil extractions need activated cannabinoids to be effective. Raw material makes for poor medicine.
Smoking/Vaping
This happens instantly with a lighter or vape. That’s why you don’t need to pre-decarb flower before smoking.
Temperature & Time Guide
Lower temps preserve terpenes but take longer. Higher temps are faster but risk degradation.
| Temperature | Time | Best For | Notes |
|---|---|---|---|
| 220°F / 105°C | 30-45 min | THC activation | Great balance of speed + preservation |
| 240°F / 115°C | 40-60 min | Most common oven method | Reliable for most home setups |
| 250°F / 120°C | 25-30 min | Quick decarb | Watch closely to avoid CBN conversion |
| 203°F / 95°C | 90 min | Sous vide / low-temp | Preserves terpenes, no smell |
Popular Methods
1. Oven Method - Classic
Break flower into popcorn-sized pieces. Spread on parchment-lined baking sheet. Bake at 240°F for 40 minutes. Stir once halfway.
2. Mason Jar Method - Low Odor
Put ground flower in a sealed mason jar. Place on baking sheet in oven at 240°F for 60 min. The jar traps smell and terpenes.
3. Sous Vide - Precision
Vacuum seal flower. Submerge in water bath at 203°F for 90 minutes. Zero smell, perfect temp control, best terpene retention.
Common Mistakes to Avoid
Too Hot
Over 300°F vaporizes THC and terpenes. You’ll end up with CBN, which is mildly sedating but not psychoactive.
Too Coarse/Fine
Grinding to powder burns easily. Leaving whole nugs decarbs unevenly. Popcorn size is perfect.
Skipping It
Adding raw flower directly to brownie mix won’t fully decarb. The internal temp of baked goods often doesn’t get hot enough.
Frequently Asked Questions
Can I decarb stems and trim?
Yes, but they’re less potent. Use 2-3x the amount you’d use of flower.
How do I know it’s done?
It’ll turn lightly toasted brown and be crumbly. It should smell nutty, not burnt.
Does decarbed weed go bad?
Store in an airtight jar in a cool, dark place. It’s good for months, but THC slowly degrades to CBN over time.
Can I decarb concentrates?
Yes. Most extracts like RSO or distillate are already decarbed. Raw rosin or hash needs 250°F for 25-30 min on parchment.