California Cannabis Cultivation Laws: Home Grow Rules

The short answer

If you are 21 or older, California lets you grow up to six cannabis plants at a private residence for personal use. No state license, no paperwork. What you cannot do is sell it. Anything beyond a small home grow counts as commercial activity, and commercial cultivation needs two things that trip up most people: a license from the California Department of Cannabis Control, and permission from the city or county where the garden sits. Local rules decide most of the real-world questions, so the same six plants can be fine in one town and a citation in the next.

Cannabis Home Grow Laws by State Guide

Personal cultivation: the six-plant baseline

Proposition 64, the Adult Use of Marijuana Act voters passed in 2016, set the floor. Adults 21 and over may cultivate up to six plants per private residence. The cap is per residence, not per adult, so a house with four roommates does not get 24 plants.

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Location rules

Plants have to stay in a locked space, either inside the home or in a fully enclosed and secured accessory structure. They also cannot be visible from a public place without binoculars, an aircraft, or another optical aid. A chain-link side yard with six-foot plants that passing cars can see is not compliant.

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Keep the grow out of reach of anyone under 21. That includes roommates' kids and visiting teenagers.

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How much you can keep

Homegrown flower is not counted the same way as store-bought. You are allowed to possess what your legal plants produce. Gifting is limited: you can give away up to 28.5 grams of flower or 8 grams of concentrate to another adult 21 or over, as long as no money or anything of value changes hands.

Medical patients

Patients with a doctor's recommendation fall under a separate medical framework, and some counties allow patients or caregivers to grow more than six plants. The six-plant residential cap is the baseline most jurisdictions enforce, so verify with your county before relying on a higher count.

What cities and counties can do

This is where California gets messy. Local governments have broad power over cannabis, and many use it.

• They can ban outdoor cultivation outright.
• They can regulate indoor grows with reasonable rules on size, odor, lighting, and structure.
• They cannot ban indoor cultivation inside a private residence or a fully enclosed, secured accessory structure.
• They can require permits, inspections, or both for commercial operations.
• Many cities and counties have banned all commercial cannabis activity, which closes off the legal market even if you would otherwise qualify.

Before you buy a light or dig a bed, check the municipal code for your city and county. Two calls, ten minutes, saves a lot of grief.

Selling homegrown cannabis

Selling cannabis without a license is a crime in California, and it stays a crime whether you are selling one jar to a friend or running a delivery route. The gift workaround, where a customer buys a t-shirt and gets weed for free, is exactly the arrangement regulators treat as an unlicensed sale.

Commercial cultivation: licenses and requirements

A legal commercial grow needs a DCC cultivation license. The state issues them by size and method: nursery, specialty cottage, specialty, small, medium, and large, each with its own canopy cap and fee. Separate licenses cover outdoor, indoor, and mixed-light operations. The largest tiers were not available until 2023.

Behind the license sits a stack of requirements.

• Local authorization. The city or county must allow the activity and sign off before the state will license you.
• Track and trace. Every plant and batch gets logged in the state's seed-to-sale system.
• Testing. Harvest batches go to a licensed lab for potency, pesticides, microbials, and heavy metals.
• Water. Diverting water for cultivation usually triggers State Water Resources Control Board requirements.
• Streambed work. Grading, culverts, or diversions near a creek can require a Lake and Streambed Alteration Agreement from the California Department of Fish and Wildlife.
• Setbacks. Licensed premises must sit at least 600 feet from a school, day care center, or youth center, and some local rules stretch that further.

Taxes

California repealed the cultivation tax on growers as of July 1, 2022. What remains is a 15% excise tax applied at retail and ordinary sales tax. If you are buying, the excise tax is baked into the shelf price or added at checkout depending on the shop.

When you go over the line

Growing more than six plants without a license can move you from an infraction with a fine into misdemeanor territory, and unlicensed commercial cultivation carries civil penalties that stack per violation. Counties also use abatement proceedings, which can mean liens on the property. Federal law has not moved: cannabis is still a controlled substance federally, and carrying plants or product across state lines is a federal offense no matter what California says.

A practical checklist

1. Confirm you are 21 or older and the grow is at a private residence.
2. Read your city and county cannabis ordinances.
3. Cap it at six plants per residence.
4. Lock the space and screen it from public view.
5. Keep it away from minors.
6. Do not sell, and do not run a gift scheme.
7. If you want to scale up, call your local planning department before the DCC.

None of this is legal advice, and local rules change often. For anything commercial, a California cannabis attorney is worth the fee.