Growing Cannabis in Washington

The state of Washington has a unique place in the history of cannabis legalization in the United States. As one of the first states to legalize recreational cannabis use in 2012 alongside Colorado, Washington’s approach to the plant, its cultivation, and its distribution has evolved rapidly. This article delves into the nuances, regulations, and best practices for growing cannabis in Washington.

Legal Landscape for Cannabis Cultivation

Recreational and Medical Cannabis

In 2012, Washington voters passed Initiative 502, legalizing the possession of limited amounts of marijuana by adults. This initiative also led to the establishment of a licensed and regulated system of cannabis production and distribution. In 2015, the medical marijuana system, which had been operating since the late 1990s, was integrated into this regulatory framework with the passing of the Cannabis Patient Protection Act.


The Washington State Liquor and Cannabis Board (WSLCB) oversees the issuance of licenses for cannabis cultivation. Growers can apply for three types of licenses:

  • Tier 1: Allows cultivation on up to 2,000 square feet.
  • Tier 2: Allows cultivation on a space between 2,000 and 10,000 square feet.
  • Tier 3: Allows cultivation on a space between 10,000 and 30,000 square feet.

Home Cultivation

As of the last update, Washington does not allow recreational home cultivation. However, qualifying medical marijuana patients can grow a limited number of plants (up to 15) for personal use, depending on their healthcare professional’s recommendation.

Climate and Geography Considerations

Washington state boasts a diverse range of climates, thanks to its size and topographical variations. The western half, influenced by the Pacific Ocean, typically has milder temperatures and more rainfall, making it more conducive to outdoor cultivation in the right conditions. On the other hand, the eastern half of the state, shielded by the Cascade Range, experiences a more continental climate, with hotter summers and colder winters.

Seasonal Considerations

Cannabis, being an annual plant, goes through its full life cycle in one growing season. Typically, seeds are germinated in early spring, with plants maturing throughout the summer and harvested in the fall. The lengthening nights of late summer and early fall naturally induce flowering in cannabis plants.

Strain Selection

Depending on where you are in Washington, the choice of cannabis strain can make a significant difference. Indica strains, which tend to mature faster and are more resilient against temperature fluctuations, can be more suitable for cooler, shorter-season climates. Sativa strains, requiring longer to mature, might fare better in the western parts of the state with longer growing seasons.

Pest and Disease Management

Like all crops, cannabis is susceptible to a variety of pests and diseases. Common pests in Washington include aphids, spider mites, and caterpillars. Meanwhile, mold, mildew, and root rot are notable diseases that can affect crops, especially in the more humid western part.

Integrated Pest Management (IPM)

IPM is an ecosystem-based strategy that focuses on long-term prevention of pests and diseases. It integrates practices that deter pests and uses environmentally sensitive pesticides only as a last resort.

Organic Cultivation

Due to the increasing demand for organically grown cannabis, many cultivators opt for natural remedies, such as neem oil, beneficial insects, and compost teas. Following organic cultivation principles not only caters to market demand but also promotes sustainable farming practices.

Harvesting and Processing

Once the cannabis plant reaches maturity, usually indicated by the trichomes’ color and the browning of pistils, it’s time to harvest. Timing is crucial. Harvest too early, and the THC concentration might be suboptimal. Delay too long, and the THC might degrade.


Plants should be carefully trimmed of fan leaves and hung upside down in a controlled environment (around 50% humidity and 60-70°F) to dry for 7-15 days.


After drying, buds should be meticulously manicured and placed in airtight containers, allowing them to “cure.” This process can take anywhere from a few weeks to several months and can significantly improve the flavor and potency of the cannabis.

Future Trends and Considerations

With the continuing evolution of cannabis regulations and increasing acceptance of the plant nationwide, Washington’s growers can anticipate shifts in the market and cultivation practices.

Technological Innovations

From automated irrigation systems to LED lighting technology, growers can expect an influx of new tools and techniques that make cultivation more efficient and eco-friendly.


As with many other agricultural sectors, sustainability is becoming a focal point. Implementing water-saving techniques, organic cultivation, and renewable energy sources will likely become not just trends but necessities in the near future.


Growing cannabis in Washington is a multifaceted endeavor, requiring knowledge of the state’s legal landscape, understanding its diverse climates, and implementing best practices in cultivation, pest management, and processing. As the industry matures, growers who prioritize sustainability, quality, and compliance are most likely to thrive.