What We’ve Learned About Potassium from Over 10,000 Tests

Hello fellow cultivators,

In our previous blog posts, we dove into the role that Potassium plays in plant performance and the effects of excessive and deficient Potassium levels. In the complex world of cannabis cultivation, managing nutrient levels is key to ensuring healthy plant growth and maximizing yield, so in this blog we’re sharing what we’ve learned from performing over 10,000 tissue tests and analyzing that data!

Our extensive analysis has provided valuable insights into potassium dynamics. First, check out this visualization of what we’ve learned about the demand for potassium during its lifecycle. Then we’ll summarize this and discuss the insights we gained.

Potassium Levels Vegetative Stage
Potassium Levels Flowering Stage

The Crucial Spike in Potassium Demand During Flowering

Our data analysis reveals a significant trend: there is a marked increase in potassium demand as cannabis plants enter the flowering stage. 

This observation is supported by the data collected from tissue tests which show a higher concentration of potassium during this critical phase. The reasons for this spike are multifaceted:

  • Enhanced Metabolic Activities: During flowering, cannabis plants undergo intense metabolic activities requiring increased amounts of potassium. This nutrient is essential for processes such as photosynthesis, nutrient transportation, and enzyme activation, all vital for developing buds.
  • Bud Formation and Development: Potassium is crucial for the regulation of water and carbohydrate transportation within the plant. These functions support the formation of sugars and starches that are essential for the density and quality of the buds.
  • Stress Response and Adaptation: The flowering stage can be particularly stressful for plants due to the high energy demands of bud development. Potassium helps improve plant resistance to environmental stresses like drought and temperature variations, which are common during this phase.
  • Cultivation Practices: Many growers adjust their nutrient regimes to increase potassium levels during flowering, anticipating the plant’s increased needs. This is often done through bloom boosters or other high-potassium fertilizer products designed to enhance flower growth and quality.

Majority Within Healthy Potassium Ranges: A Testament to Good Management

Despite the challenges posed by these increased demands, the majority of tissue tests indicate that potassium levels are maintained within healthy ranges. Our data shows that in the flowering stage, about 81% of samples fall within the ideal range, with only 0.3% showing excessive levels and 18.7% being low. This suggests that most cultivators are successful in managing potassium levels, likely because of:

  • Regular Monitoring: Effective nutrient management often involves regular testing and monitoring of soil and tissue nutrient levels, allowing growers to make informed decisions about fertilization.
  • Adaptive Fertilization Practices: Growers are increasingly adopting precision agriculture techniques, which involve adjusting nutrient applications based on the specific needs of their plants at various growth stages.
  • Education and Resources: The availability of detailed analytical data and cultivation guidance has empowered growers to understand and meet the specific nutrient needs of cannabis plants more effectively.


From analyzing over 10,000 tissue tests, it’s clear that potassium is a key player in cannabis cultivation, especially during the flowering stage. While the demand for potassium significantly increases during this period, effective management practices will help the majority of cultivators maintain it within optimal levels. This balance is crucial not only for the health of the plants but also for the quality and yield of the final product. 

Want to see what’s going on inside your plants? Arvum Plant Labs provides new clients with a complimentary initial round of leaf tissue and water testing. Uncover the exact levels of Potassium in your plants and receive a thorough assessment of all macro, micro, and trace nutrients. 

Call 707-398-8346 or email sales@arvumplantlabs.com and see the true nutrient levels of the plants in your cultivation! Begin your journey toward optimal plant health and productivity today!

Arvum Empowering Growers Transforming Cultivation

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