Growing Cannabis in Western Australia

Western Australia (WA), the largest state in Australia, presents a unique set of challenges and opportunities for those interested in cultivating cannabis. Given its diverse climates, from temperate regions in the south to tropical regions in the north, cultivation techniques can vary widely. This article provides an overview of the key factors to consider when growing cannabis in WA, including the legal context, climatic considerations, and best practices for cultivation.

Legal Context

Before discussing the specifics of growing cannabis in WA, it’s crucial to understand the legal framework surrounding its cultivation:

Medical Cannabis

As of the last update in 2021, the cultivation of cannabis for medicinal purposes is legal in Australia under specific federal licensing provisions. Licensed growers can produce cannabis crops for medicinal products under the Narcotic Drugs Amendment Act 2016, provided they meet the stringent requirements and security measures set by the Australian Government.

Recreational Cannabis

Cultivating cannabis for recreational use remains illegal in Western Australia, regardless of the amount. Those caught growing even a single cannabis plant for personal use face hefty fines, while cultivation for supply or sale can result in prison terms.

Hemp Cultivation

In contrast to the stringent rules surrounding cannabis, hemp cultivation (cannabis strains with less than 1% THC) is legal and regulated in WA. These strains are grown primarily for industrial purposes, including textiles, building materials, and biofuels.

Climatic Considerations

Western Australia’s vast size means it encompasses a variety of climate zones. These zones can influence the growth cycle, yield, and health of cannabis plants:

Northern Tropical Regions

Areas like the Kimberley and Pilbara experience a tropical climate with a wet and dry season. Growers in these regions often need to consider high humidity levels during the wet season, which can lead to mold and mildew issues.

Central Arid Zones

The central regions, such as the Goldfields and parts of the Mid West, are more arid. Here, water conservation and efficient irrigation systems are vital. Additionally, extreme temperatures can stress plants, requiring shade structures or timed light exposure.

Southern Temperate Zones

Regions like the South West and Great Southern have a Mediterranean climate. This climate is most suitable for cannabis cultivation with its mild, wet winters and hot, dry summers. However, growers should still monitor for pest and disease outbreaks during warmer months.

Cultivation Best Practices

Considering the climatic challenges of WA, adhering to cultivation best practices ensures the health and yield of cannabis crops:

Choosing the Right Strain

Given WA’s diverse climate, selecting the appropriate strain is vital. Some strains are more resilient to humidity, drought, or temperature extremes. Researching and picking a strain that matches the specific region’s climate will significantly increase chances of a successful harvest.

Soil and Nutrition

Cannabis prefers well-draining soil rich in organic matter. In regions with sandy or heavy clay soils, it might be necessary to amend the soil or consider raised beds. Regularly test the soil for nutrient levels and pH, and adjust as necessary with organic fertilizers and pH balancers.

Pest and Disease Management

Cannabis plants in WA can be susceptible to a range of pests, including aphids, spider mites, and caterpillars, as well as diseases like powdery mildew. Regularly inspect plants, maintain a clean grow area, and use natural predators or organic pesticides when necessary.

Harvesting and Curing

The optimal time to harvest largely depends on the strain and desired effects. However, some general guidelines apply:

Harvest Timing

Typically, when 50-70% of the trichomes (tiny resin glands on the buds) have changed from clear to milky white, and 10-20% have turned amber, it’s time to harvest. Using a magnifying glass can help in determining this.


After harvesting, buds should be hung in a dark, cool place with good ventilation for 7-14 days until the stems snap rather than bend.


Once dried, trim the buds and place them in airtight containers, opening them for a few minutes daily for the first couple of weeks to allow any remaining moisture to escape and replenish oxygen.

Final Thoughts

Growing cannabis in Western Australia, whether for medical, industrial, or personal research purposes, requires a deep understanding of the region’s legal and environmental landscape. By adhering to best practices and being responsive to the unique challenges of the WA climate, cultivators can optimize their yields and ensure the health of their crops.