Check optimal pH cannabis plants

When growing cannabis plants, it is important to monitor and adjust the pH level of the soil or substrate. An incorrect pH level can lead to problems with nutrient absorption, which in turn can lead to reduced growth and yield of your plants. In this article, we'll discuss how to monitor and adjust the pH level of your cannabis plants.

What is pH and why is it important?

The pH value indicates the acidity of the soil or substrate. The pH scale runs from 0 to 14, with 7 being neutral. A pH value below 7 indicates acidity, while a pH value above 7 is basic. Cannabis plants thrive in a slightly acidic environment with a pH level between 6.0 and 7.0. When the pH level is too low or too high, the absorption of nutrients by the plants can be hindered.

How do you measure the pH value?

The pH value can be measured with a pH meter. There are several types of pH meters available, from simple analog meters to advanced digital meters with different functions. It is important to use a pH meter that is suitable for the application and accurate enough to measure the pH of your soil or substrate.

Measuring the pH value is easy. Fill a cup with some soil or substrate, add water and stir well. Then let the mixture sit for a few minutes to allow the sediment to settle. Place the pH meter in the water and wait for the reading to stabilize. The pH value is displayed on the pH meter screen.

How do you adjust the pH value?

If the pH of your soil or substrate is too high, you can lower it by adding acidic nutrients such as citric acid or vinegar. Adding sulfur or phosphoric acid can also help lower the pH level. To raise the pH value, you can add basic nutrients, such as calcium carbonate or lime.

However, adjusting the pH level is not an exact science. It is important to adjust the pH level slowly and measure it regularly to make sure you are not over or under adjusting. Over-adjusting can lead to a sudden change in the pH level, potentially damaging the plants.


Monitoring and adjusting the pH of the soil or substrate is essential to growing healthy cannabis plants. Be sure to measure and adjust the pH level regularly to increase or decrease the pH level as needed. Then add the recommended amount of pH adjuster and mix well into the soil.

After adjusting the pH value, it is important to measure again and adjust again if necessary. It's also important to remember that adjusting the pH level takes time and you won't see immediate results. Give the plants time to absorb the adjusted pH level and measure regularly to ensure that the pH level remains stable.

Alternative methods for adjusting the pH value

In addition to using pH adjusters, there are alternative methods for adjusting the pH level of your cannabis plants. A common method is the use of organic matter such as compost or lime to increase the pH value. However, these methods are slower and less accurate than using pH adjusters.

Another method is to use rainwater or distilled water instead of tap water, as tap water often has a higher pH value. However, this method can only be used if the water you use does not contain important nutrients that your plants need.


The pH level is an important factor in the health and growth of your cannabis plants. It is essential to regularly measure the pH level of your soil or substrate and adjust it if necessary to ensure that your plants can absorb the correct nutrients. By using pH adjusters and choosing the right nutrients, you can monitor and adjust the pH level of your cannabis plants for optimal growing conditions. Don't forget to measure regularly and adjust the pH level if necessary, and give your plants time to absorb and react to the adjusted pH level.

Note: Growing cannabis may be illegal in your country or region. Make sure you are aware of the laws and regulations before you start growing. The information in this blog is for educational purposes only and is not a substitute for professional advice. Always comply with applicable laws and regulations and contact local authorities if you have any questions.