Washington’s mild, rainy climate is naturally suited for growing high-yield marijuana strains outdoors. If you’re looking for the best marijuana strains to grow in washington, you need varieties that handle humidity, cool nights, and shorter summers. This guide covers top picks, growing tips, and common mistakes to avoid.
Growing cannabis in Washington is different from California or Colorado. Your plants face mold, mildew, and sudden temperature drops. But with the right genetics, you can still get heavy harvests. Let’s break down the strains that thrive here.
Best Marijuana Strains To Grow In Washington
These strains are proven winners for Washington’s unique environment. They resist mold, finish before October rains, and produce dense buds. Each one has specific strengths for outdoor or greenhouse growing.
Blue Dream
Blue Dream is a classic for Washington growers. It handles cool, damp weather well and finishes in late September. The buds are fluffy but resistant to bud rot. You get a balanced high with berry flavors.
- Flowering time: 9–10 weeks
- Yield: 4–6 ounces per plant outdoors
- Mold resistance: High
- Best for: Beginners and intermediate growers
Northern Lights
Northern Lights is a short, sturdy indica that loves Washington’s climate. It flowers fast (7–8 weeks) and produces thick, resinous buds. The plant stays compact, making it good for hidden spots or small greenhouses.
- Flowering time: 7–8 weeks
- Yield: 3–5 ounces per plant
- Mold resistance: Very high
- Best for: Cool, rainy areas
Girl Scout Cookies
GSC is a bit more finicky but rewards you with potent, colorful buds. It needs good airflow to prevent mold. Grow it in a greenhouse or under a rain cover for best results. The high is strong and euphoric.
- Flowering time: 9–10 weeks
- Yield: 3–4 ounces per plant
- Mold resistance: Moderate
- Best for: Experienced growers with covered spaces
Super Lemon Haze
This sativa-dominant strain loves sunshine but can handle some rain. It stretches tall, so give it support. The buds are airy, which helps prevent mold. Expect a zesty, energizing high.
- Flowering time: 10–11 weeks
- Yield: 4–5 ounces per plant
- Mold resistance: Moderate
- Best for: Sunny spots with afternoon shade
White Widow
White Widow is a reliable workhorse. It resists mold and pests well. The buds are dense but not too tight, allowing airflow. It finishes in early October, just before heavy rains.
- Flowering time: 8–9 weeks
- Yield: 4–6 ounces per plant
- Mold resistance: High
- Best for: All skill levels
Pineapple Express
This strain is surprisingly tough. It handles humidity and cooler nights. The buds are dense but have good mold resistance. The flavor is tropical and sweet. It finishes in late September.
- Flowering time: 8–9 weeks
- Yield: 4–5 ounces per plant
- Mold resistance: High
- Best for: Coastal areas with fog
Critical Mass
Critical Mass is a heavy yielder with thick buds. It needs good air circulation to avoid mold. Grow it in a greenhouse or use fans if indoors. The high is relaxing and body-focused.
- Flowering time: 8–9 weeks
- Yield: 5–7 ounces per plant
- Mold resistance: Moderate
- Best for: Greenhouse or covered outdoor
OG Kush
OG Kush is a classic but needs careful management. It’s prone to mold in wet conditions. Grow it in a spot with excellent drainage and airflow. The buds are dense and potent.
- Flowering time: 9–10 weeks
- Yield: 3–4 ounces per plant
- Mold resistance: Low to moderate
- Best for: Experienced growers with dry microclimates
Choosing The Right Strain For Your Washington Microclimate
Washington has diverse growing zones. Western Washington is wet and mild. Eastern Washington is drier and hotter. Your strain choice depends on where you live.
Western Washington (Coastal, Rainy)
This area gets 30–50 inches of rain yearly. Mold is your biggest enemy. Choose strains with high mold resistance and fast flowering times. Blue Dream, Northern Lights, and White Widow are top picks.
- Focus on mold-resistant genetics
- Use raised beds or pots for drainage
- Consider a greenhouse or hoop house
- Harvest before October rains
Eastern Washington (Dry, Hot Summers)
This region has less rain but hotter summers. Strains like Super Lemon Haze and OG Kush do well here. You need to watch for heat stress and spider mites. Provide afternoon shade if temps exceed 95°F.
- Choose heat-tolerant strains
- Use mulch to retain moisture
- Water deeply but less often
- Watch for powdery mildew in late summer
Puget Sound Region (Moderate, Variable)
This area has a mix of rain and sun. Strains like Girl Scout Cookies and Pineapple Express can work with some protection. Use fabric pots for better drainage. Monitor humidity levels closely.
- Use a rain cover during flowering
- Space plants for airflow
- Apply organic fungicides preventatively
- Harvest as soon as trichomes are ready
How To Grow Marijuana Outdoors In Washington Successfully
Follow these steps to maximize your harvest. Washington’s climate requires extra care, but the results are worth it.
Step 1: Start Seeds Indoors
Start your seeds indoors in April. Use a heat mat and grow lights. Transplant outdoors after the last frost, usually mid-May. This gives plants a head start.
- Soak seeds in water for 12 hours
- Plant in small pots with seed-starting mix
- Keep soil moist but not wet
- Provide 18 hours of light daily
- Harden off plants for 7–10 days before transplanting
Step 2: Prepare Your Soil
Washington soil is often acidic and clay-heavy. Amend it with compost, perlite, and lime. Raised beds or large pots work best. Test your soil pH and adjust to 6.0–7.0.
- Add 2–3 inches of compost
- Mix in perlite for drainage
- Add dolomite lime to raise pH
- Use fabric pots for better aeration
Step 3: Choose The Right Location
Find a spot with at least 6–8 hours of direct sunlight. Morning sun is best to dry dew. Avoid low areas where cold air settles. Protect plants from strong winds.
- South-facing slopes are ideal
- Use trellises or stakes for support
- Plant near a wall or fence for heat reflection
- Avoid areas with standing water
Step 4: Water And Feed Correctly
Overwatering is a common mistake. Let soil dry out between waterings. Use a drip irrigation system to keep leaves dry. Feed with organic nutrients every 2–3 weeks.
- Water deeply once a week in cool weather
- Increase to twice a week in hot spells
- Use fish emulsion or compost tea
- Stop feeding 2 weeks before harvest
Step 5: Prevent Mold And Pests
Mold is the biggest threat in Washington. Use preventive sprays like neem oil or potassium bicarbonate. Inspect plants daily for signs of bud rot. Remove affected buds immediately.
- Prune lower branches for airflow
- Apply sulfur spray before flowering
- Use sticky traps for fungus gnats
- Introduce ladybugs for aphids
Step 6: Harvest At The Right Time
Harvest when trichomes are milky with some amber. In Washington, this is usually late September to mid-October. Check weather forecasts and harvest before heavy rain.
- Use a jeweler’s loupe to check trichomes
- Harvest in the morning after dew dries
- Cut whole plants or branches
- Dry in a dark, ventilated space at 60–70°F
Common Mistakes Washington Growers Make
Avoid these errors to save time and frustration. Many beginners lose their harvest to preventable issues.
Planting Too Late
If you plant seeds directly outdoors in June, your plants won’t finish before frost. Start indoors or use clones. Aim for transplanting by late May.
Ignoring Mold Signs
White powdery spots or gray fuzz on buds means trouble. Act fast by removing affected parts and improving airflow. Don’t wait—mold spreads quickly in damp weather.
Overwatering
Washington’s rain does some of the watering for you. Check soil moisture before adding more. Overwatering leads to root rot and weak plants.
Using Too Much Nitrogen
High nitrogen in late summer causes leafy buds that attract mold. Switch to bloom nutrients with lower nitrogen once flowers appear.
Not Supporting Branches
Heavy buds can snap branches in wind or rain. Use stakes, cages, or trellises. Tie branches gently to prevent damage.
Indoor Vs. Outdoor Growing In Washington
Both methods have pros and cons. Indoor gives you control, but outdoor is cheaper and yields more. Consider your space and budget.
Outdoor Growing
- Lower cost (no lights or ventilation)
- Larger plants and yields
- Natural sunlight improves potency
- Risk of mold, pests, and theft
- Limited to one harvest per year
Indoor Growing
- Full control over environment
- Multiple harvests per year
- No weather risks
- Higher electricity and equipment costs
- Smaller plant size
Greenhouse Growing
Greenhouses offer the best of both worlds. They protect from rain while using natural light. You can also control temperature and humidity. Many Washington growers prefer this method.
- Use auto-venting windows for heat control
- Add shade cloth in summer
- Use fans for air circulation
- Consider light deprivation for multiple harvests
Frequently Asked Questions
What are the best marijuana strains to grow in Washington for beginners?
Blue Dream, Northern Lights, and White Widow are great for beginners. They resist mold, grow easily, and produce reliable yields. Start with these to build confidence.
Can I grow marijuana strains in Washington year-round?
Outdoor growing is seasonal (April to October). Indoor growing allows year-round cultivation. Greenhouses can extend the season but still face cold winter temps.
How do I prevent bud rot in Washington’s humid climate?
Choose mold-resistant strains, space plants for airflow, and use preventive sprays. Harvest before heavy rains. Remove any infected buds immediately to stop spread.
What is the best time to plant marijuana in Washington?
Start seeds indoors in April. Transplant outdoors after the last frost, typically mid-May. This gives plants a full growing season before October harvest.
Are autoflowering strains good for Washington?
Yes, autoflowers can work well. They flower based on age, not light cycle, so they finish faster. This helps avoid fall rains. Look for mold-resistant autoflower varieties.
Final Tips For Washington Growers
Growing in Washington takes planning but pays off. Focus on mold prevention and strain selection. Keep a garden journal to track what works in your specific area.
Talk to local growers at dispensaries or online forums. They know the best strains for your microclimate. Share tips and learn from their successes and failures.
Remember that each season is different. Some years are wetter, some drier. Adapt your methods based on weather forecasts. Be flexible and patient.
With the right strains and care, you can harvest pounds of top-quality bud. Washington’s climate is a challenge, but it also produces some of the most flavorful, potent cannabis around. Happy growing.