Is It Legal to Grow Cannabis at Home in Washington? (2026 Rules)

Jurisdiction: Washington  |  Last verified: September 4, 2026  |  Program: Medical cannabis only

Quick answer: Washington does not allow a general adult-use home grow. A qualifying medical patient or designated provider with a valid medical cannabis authorization may grow four plants at home. A patient or provider entered in the Medical Cannabis Registry with a recognition card may ordinarily grow six plants, or up to 15 when the healthcare practitioner documents the higher number.

Washington medical home-grow limits

• Valid authorization, not registered: up to four plants at the patient’s domicile and up to six ounces of usable cannabis produced from those plants.
• Recognition card holder: six plants for personal medical use and up to eight ounces of usable cannabis produced from those plants.
• Higher practitioner authorization: a recognition card may show seven to 15 plants when the healthcare practitioner determines the patient needs more than six; the related usable-cannabis limit is 16 ounces.
• Housing-unit cap: no more than 15 plants in one housing unit, even when multiple patients or designated providers live there, except for a properly registered cooperative.
• Designated provider: the provider must be named on the patient’s authorization and meet the medical-program requirements before growing for the patient.

Authorization form versus recognition card

A medical cannabis authorization is the document issued by an eligible healthcare practitioner. An adult patient with a valid authorization may grow up to four plants without entering the state registry, but the person has an affirmative defense rather than the stronger arrest protection available to a registered recognition-card holder.

Registration is voluntary for most adult patients, but a recognition card increases the ordinary plant limit to six and allows the practitioner to document a medically necessary limit of up to 15 plants.

Before you start

1. Confirm medical eligibility. Obtain the current Washington medical cannabis authorization form from an eligible healthcare practitioner.
2. Read the plant number on the documents. Do not assume every patient automatically receives 15 plants.
3. Decide whether to register. An authorization-only patient and a recognition-card holder have different limits and legal protections.
4. Count the housing unit. Multiple patients do not raise an ordinary home above 15 plants.
5. Keep the grow personal and medical. A home-grow authorization is not a commercial cultivation license.

Official Washington sources

• Washington State Liquor and Cannabis Board: Growing cannabis at home
• Washington State Department of Health: Patient information and possession amounts
• Washington medical cannabis patient FAQ

Ready to learn the cultivation side?

After the medical authorization and plant limit are confirmed, use the HWGrow complete beginner guide for a practical seed-to-harvest workflow.

Compare Washington with the HWGrow U.S. cannabis home-grow law guide.

Washington home-grow FAQ

Can a Washington recreational consumer grow cannabis at home?

No. Washington home cultivation is limited to qualifying medical patients or designated providers with a valid authorization.

How many plants may a Washington medical patient grow?

An authorization-only patient may grow four plants. A registered recognition-card holder may ordinarily grow six, or up to 15 when the healthcare practitioner documents the higher need.

Can several Washington patients grow more than 15 plants in one home?

No. The ordinary cap is 15 plants per housing unit even when multiple qualifying patients or designated providers live there. A properly registered cooperative is the exception.