Cannabis Edibles from Homegrown Flower: Decarb, Infusion, and Dosing

You grew it, dried it, cured it. Now you want to eat it. Making edibles from homegrown cannabis is straightforward once you understand two things: decarboxylation (the heat activation step most beginners skip) and dosing (the math that prevents you from eating 10× more than you intended).

This guide covers the science and process of turning dried cannabis flower into consistently dosed, properly activated edibles.

Step 1: Decarboxylation (mandatory)

Why you must decarb

Raw cannabis contains THCA, not THC. THCA is non-psychoactive — eating raw flower produces no high. Heat converts THCA to THC through a process called decarboxylation (removing a carboxyl group from the molecule).

When you smoke or vaporize cannabis, decarboxylation happens instantly from the heat. When making edibles, you need to decarb the flower BEFORE infusing it into fat — otherwise your butter will contain mostly inactive THCA.

How to decarb

Oven method (most common):

1. Preheat oven to 240°F (115°C)
2. Break flower into small pieces (pea-sized, not ground to powder — powder burns easily)
3. Spread evenly on a baking sheet lined with parchment paper
4. Bake for 40–60 minutes
5. The flower should turn from green to golden-brown and smell toasted
6. Remove and let cool before handling

The temperature-time relationship:

240°F for 40 minutes is the standard. This maximizes THC conversion while minimizing THC degradation and terpene evaporation.

Decarb tips

• Don't grind before decarbing. Finely ground flower has more surface area, which increases terpene loss and the risk of burning
• Use an oven thermometer. Home ovens are notoriously inaccurate — verify your oven actually reaches and maintains 240°F
• Contain the smell. Decarbing smells strongly. An oven bag (turkey bag) tied closed on the baking sheet contains most of the aroma. Mason jar decarbing (sealed jar in the oven) also works and contains smell completely
• Don't skip this step. The most common cause of weak edibles is insufficient decarboxylation

Step 2: Infusion into fat

THC is fat-soluble, not water-soluble. It needs a fat carrier to be absorbed by your digestive system. The two most common carriers:

Cannabutter

Ingredients:

• 1 cup (2 sticks) unsalted butter
• 7–14 grams of decarbed flower (see dosing section)
• 1 cup water (prevents butter from burning)

Process:

1. Melt butter in a saucepan with 1 cup of water over low heat
2. Add decarbed flower to the butter-water mixture
3. Maintain temperature at 160–180°F (a very low simmer — no boiling). If the mixture boils, you're too hot and will degrade THC
4. Stir occasionally and maintain low heat for 2–3 hours
5. Strain through cheesecloth into a container. Squeeze the cheesecloth to extract all the butter
6. Refrigerate. The butter will solidify on top of the water. Remove the solid butter disk, discard the water
7. The butter is ready to use in any recipe

Infused coconut oil

Ingredients:

• 1 cup coconut oil (solid or liquid)
• 7–14 grams of decarbed flower

Process:

1. Combine coconut oil and decarbed flower in a saucepan or slow cooker
2. Heat at 160–180°F for 2–3 hours (slow cooker on "warm" or lowest setting)
3. Strain through cheesecloth into a container
4. Let cool. Coconut oil solidifies below 76°F

Why coconut oil: it has a higher percentage of saturated fat than butter, which binds more THC per volume. It's also vegan, shelf-stable longer, and works in both cooking and baking.

Slow cooker method (easiest)

1. Combine fat and decarbed flower in a slow cooker
2. Set to "warm" or lowest setting (check with a thermometer — target 160–180°F)
3. Let cook for 4–6 hours, stirring occasionally
4. Strain and store

The slow cooker method is the easiest because it maintains steady, low temperature without constant attention.

Step 3: Dosing math

This is where most homemade edibles go wrong. Dispensary edibles are lab-tested for precise dosing. Homemade edibles require you to calculate the dose yourself.

The formula

Total THC (mg) = grams of flower × THC% × 10 × decarb efficiency

Example: 7 grams of flower at 20% THC:

7 × 20 × 10 × 0.95 = 1,330 mg total THC in the batch

If you infuse that into 1 cup of butter (16 tablespoons):

1,330 ÷ 16 = ~83 mg THC per tablespoon

If a cookie recipe calls for 4 tablespoons of butter and makes 12 cookies:

(4 × 83) ÷ 12 = ~28 mg per cookie

Dosing guidelines

Start low. If you've never eaten edibles, start at 5 mg and wait 2 hours before eating more. Edibles take 45–120 minutes to onset and last 4–8 hours. You can always eat more; you can't eat less.

The homemade dosing problem

The biggest challenge with homemade edibles is consistency. Even with careful math, the THC distribution in your infused butter isn't perfectly even — some spoonfuls may be stronger than others.

Mitigation:

• Stir the butter or oil thoroughly before portioning
• Use recipes that distribute the fat evenly (brownies, cookies) rather than recipes where fat pooling is possible
• Test-dose a small amount (a teaspoon of butter on toast) before committing to a full batch of brownies

If you don't know the THC percentage

Most homegrown cannabis is in the 15–25% THC range. If you don't have a lab test:

• Assume 15% THC for conservative dosing (better to be under-dosed than over-dosed)
• The calculation with 7 grams at 15%: 7 × 15 × 10 × 0.95 = ~1,000 mg total

Using trim and sugar leaves

You don't have to use prime bud for edibles. Trim (sugar leaves, small buds, popcorn buds) works well and is a better use of material that wouldn't be enjoyable to smoke:

Increase the amount of trim proportionally to compensate for lower THC content. The infusion process is the same.

Storage

• Cannabutter: refrigerator for 2–4 weeks, freezer for 6 months
• Infused coconut oil: room temperature in an airtight container for 2–3 months, refrigerator for 6 months
• Finished edibles: same shelf life as the base recipe (brownies = 1 week room temp, 2 weeks fridge; gummies with preservatives = 2–4 weeks)
• Label everything. Mark containers clearly with "THC" and approximate dosage per serving. Keep away from children, pets, and anyone who shouldn't accidentally eat them

Common mistakes

1. Skipping decarboxylation — raw flower contains THCA, not THC. Without decarbing, your edibles will be weak or inactive. Always decarb at 240°F for 40 minutes before infusing
2. Overheating during infusion — boiling the butter/oil destroys THC and terpenes. Keep temperature at 160–180°F. A thermometer is essential
3. Not doing the dosing math — "I'll just put a bunch in and see" leads to either weak edibles (waste of flower) or dangerously strong edibles (miserable 8-hour experience). Calculate the dose before cooking
4. Not waiting long enough — edibles take 45–120 minutes to kick in. Eating a second dose at 30 minutes because "it's not working" leads to consuming double the intended dose. Wait at least 2 hours
5. Using fan leaves — fan leaves contain negligible THC. Use sugar leaves, trim, or flower. Fan leaves add plant taste without meaningful potency

For the harvest and curing process, see our harvest guide and curing guide.