First, an important point: Washington does not allow adult use home grow. Adults 21 and older can buy cannabis from licensed retailers, but growing at home is legal only for qualifying medical patients and designated providers with a valid authorization under RCW 69.51A. If you are an authorized patient, the best strains to grow outdoors in Washington are mold resistant, early finishing plants for the wet west side, like Durban Poison and White Widow Fast, and hardy, fast plants for the sunny but short east side seasons, like Early Skunk Fast and Northern Lights Auto. Visit our Washington seeds page for the latest on Washington law.

This article is general information, not legal advice. Check the current law and your authorization before growing.

Who can legally grow in Washington

Washington legalized adult use cannabis sales in 2012 but did not include home cultivation for adults. Under RCW 69.51A.210, qualifying patients and designated providers with an authorization from a health care professional may grow in their domicile:

• Up to six plants if entered in the state medical cannabis authorization database without a higher recommendation.
• Up to fifteen plants if the health care professional recommends a higher amount and it is entered in the database.
• Up to four plants if the patient has an authorization but is not entered in the database.

Under RCW 69.51A.260, no more than fifteen plants may be grown in one housing unit, and growing must not be readily seen by normal unaided vision or readily smelled from a public place or another housing unit. Local governments may enforce civil penalties for noncompliance.

Bills to allow adult home grow, including SB 6204 and HB 1449, did not pass in 2026. Until the law changes, growing without a medical authorization is not legal in Washington.

Washington growing regions and what they need

Puget Sound and western Washington

Mild summers, cloudy springs and an early, wet fall. Bud rot is the main risk.

Look for: mold resistant, early finishing strains and autos, ideally under cover.

Olympic Peninsula and the coast

Cool, damp and foggy, with some of the most rain in the lower 48.

Look for: autoflowers and greenhouse growing.

Columbia Basin and central Washington

The Yakima Valley and Tri Cities area have hot, dry, sunny summers and a longer season.

Look for: vigorous photoperiods and heat tolerant strains.

Spokane and northeast Washington

Warm, dry summers but colder nights and an earlier frost.

Look for: fast versions and autoflowers.

Our best strains for growing in Washington

All of these are in stock at Kind Seed Co.

Durban Poison

Durban Poison Photo Fem is part of our mold resistant collection with airy buds that handle damp weather better than dense colas. Try Durban Poison Auto Fem for a faster run.

White Widow Fast

White Widow Fast Photo Fem finishes ahead of the regular version, helpful west of the Cascades.

Early Skunk Fast

Early Skunk Fast Photo Fem is hardy and early, good for the Spokane area and cooler west side gardens.

Northern Lights Auto

Northern Lights Auto Fem is compact and quick, easy to keep private and finish before fall rain.

Super Silver Haze

Super Silver Haze Photo Fem is a mold resistant collection pick for long, dry eastern Washington seasons.

Blue Dream Auto

Blue Dream Auto Fem brings Pacific Coast favorite genetics into a small, fast plant.

Washington growing calendar

Time	What to do
Winter	Confirm your authorization and plant count. Choose strains
April	Start photoperiods indoors
May	Transplant east of the Cascades after the last frost
Late May to June	Transplant west of the Cascades
June to July	Train, stake and check for pests
August	Photoperiods begin to flower
September	Harvest autos and fast versions
Late September to early October	Harvest before steady fall rain on the west side

Washington specific growing tips

Grow under cover on the west side

A greenhouse or hoop house keeps rain off buds and helps keep plants out of view, which matters under RCW 69.51A.260.

Control odor and visibility

Washington law prohibits growing that can be readily seen or smelled from a public place or another housing unit. Choose a hidden spot, use fencing and consider a carbon filtered greenhouse or indoor grow for odor control.

Water deeply in the east

Columbia Basin summers are hot and dry. Mulch, drip irrigation and early morning watering help.

Start seedlings indoors

West side springs are cool and cloudy. Starting photoperiod seedlings indoors under lights in April gives them a strong root system before transplanting, and it lets you hold off planting until nights stay reliably above about 50 degrees Fahrenheit.

Fight mold

Prune for airflow, space plants and inspect buds after every rain.

Keep your paperwork in order

Authorized patients should keep a copy of their authorization and, if entered in the database, their recognition card where they grow. RCW 69.51A.210 allows patients to keep only the plants and amounts their authorization covers, so track your plant count as seedlings come and go. Every plant you grow counts toward your limit, so plan your garden around the number your authorization allows.

Dry and cure indoors

West side falls are wet, and even east side nights turn damp in October. Hang branches in a clean, dark indoor room with gentle airflow and steady temperatures. Our guide to drying cannabis in high humidity explains the setup.

Choose feminized seeds

Feminized seeds help you avoid male plants taking up space in a limited plant count. Every strain in this guide is feminized.

Common mistakes Washington growers make

• Assuming adult use legal sales mean home grow is legal. It is not.
• Growing more plants than an authorization allows.
• Letting plants be seen or smelled from a public place or a neighbor’s home.
• Planting long flowering strains west of the Cascades with no rain plan.

Frequently asked questions

Is it legal to grow cannabis at home in Washington?

Only for qualifying medical patients and designated providers with a valid authorization. Adult use home grow is not legal. This is not legal advice.

How many plants can a Washington medical patient grow?

Up to six plants if entered in the authorization database, up to fifteen with a health care professional’s recommendation entered in the database, or up to four if not entered. No more than fifteen per housing unit.

Did Washington legalize home grow in 2026?

No. SB 6204 and HB 1449 did not pass.

What is the best strain to grow outdoors in western Washington?

Mold resistant, early finishing strains like Durban Poison and White Widow Fast, or autoflowers like Northern Lights Auto, ideally under cover.

What grows well in eastern Washington?

The dry, sunny Columbia Basin suits vigorous photoperiods like Super Silver Haze, while the Spokane area suits fast versions and autos.

Do I need a greenhouse in Washington?

West of the Cascades, a greenhouse or hoop house helps a lot with rain and privacy. East of the Cascades, many authorized patients grow in a fenced, screened garden.

Stay informed on Washington law

If you are an authorized patient, pick a strain that matches your side of the mountains, keep plants hidden and odor controlled and stay within your plant count. For everyone else, watch for changes in Washington law. Visit the Kind Seed Co Washington seeds page for updates or explore the full Kind Seed Co shop. Kind Seed Co sells only to adults 21 and older. Always follow the home grow laws where you live.

Sources: RCW 69.51A.210, RCW 69.51A.260 and SB 6204 (2026) bill summary, accessed October 29, 2026.