The Importance of pH Levels in Coco Coir for Plant Growth

In agriculture, coco coir is a popular soil substitute, in addition to its water and nutrient retention capabilities, it is also sustainable and environmentally friendly. However, to ensure that plants grow well, it is important to ensure that the technical indicators of coco coir are suitable for each type of plant. Among these indicators, the pH level is the most important as it determines the growth and development of plants.

So, how important is pH and how do you adjust the coco coir pH substrates? We invite you to read our article below.

Coco coir ph

What is Coco Coir and How is it made?

Coco coir is a clean source of raw material extracted from coconut husks, used as a substitute for soil in agriculture. Before being used, coco coir must be processed to fit the needs of the plants by treating it with tannin, lignin, EC, and pH.

Coco coir has pleased many growers due to its safe, gentle, and environmentally friendly properties. Using coco coir in farming not only brings abundant crops but also helps improve the soil as it becomes an excellent covering layer.

To produce coco coir, the outer layer of the coconut is first removed, and the remaining part is soaked in water to soften it. The coco fibers are then separated from the harder pieces.

After being separated, the coco coir is washed to remove any remaining impurities or debris. They are then dried under the sunlight or by a drying machine and shredded into a planting substrate. They will be classified based on their size and quality. The small chunks are called coco chips, the fibrous materials are called coco fibers, and the fine materials (powder) are called coco peat.

Pros and Cons of Using Coco Coir as a Growing Medium


Some outstanding advantages of coco coir are as follows:

  • Environmentally friendly: Coco coir contains natural ingredients and is made from 100% dried coconut husks. It is also a sustainable medium and a renewable resource.
  • Good water retention: Coco coir has excellent water retention abilities, helping plants maintain appropriate and regular moisture for many types of crops, and reducing the time of irrigation.
  • Desirable aeration: Coco coir has good air circulation, providing plant roots with the necessary amount of oxygen to promote better growth.
  • Natural pest resistance: Coco coir contains some natural substances that have antibacterial and antifungal properties, which help prevent the attack of harmful pests and reduce the need for chemical pesticides.


However, coco coir also has some disadvantages. The task of the grower is to understand them in order to select and adjust the appropriate planting materials. The disadvantages of coco coir are:

  • High salt concentration: Some types of coco coir may have high salt concentrations, which can negatively affect plant growth if not rinsed before use. This is also why growers are advised to choose coco coir products that have been processed correctly and have a trusted source of origin.
  • Oil: Coco coir contains a certain amount of oil, so if not processed carefully, it can become a barrier that prevents the roots from receiving air, causing harm to the plants.

What is Coco Coir and How is it Made?

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✓ Ready to use (no need to pre-rinse)

✓ Specialized for greenhouse crops


✓ Specialized for greenhouse crops

✓ Recommended to use alongside with coco coir grow bags

✓ Economical and versatile for different uses

✓ Suitable for both commercial and individual growers

✓ Lightweight, easy to carry and use

✓ Easy to transport with large quantities

✓ Economical and convenient to use

✓ Easy to transport by forklifts

✓ Lightweight, easy to carry and use

✓ Convenient to transport with large quantities

✓ Convenient to use

✓ Specialized for soft fruit, ginger, cannabis, etc.

Understanding pH in Agriculture and Why it matters

What is pH?

pH is a measure of the electrical charge concentration of a solution, determining the acidity, alkalinity or neutrality of the medium. In agriculture, pH plays an important role in regulating the acidity or alkalinity of the soil, significantly affecting the health and yield of crops.

What is pH?

The role of pH in plant growth

The amount of nutrients and other substances that are soluble in soil water and hence available to plants depends on the pH of the soil. While some nutrients are more readily available in acidic environments, others are more readily available in alkaline environments. Most of them are readily available to plants while the soil is at neutral pH, so that is why most plants prefer pH neutralized.

In soil-based gardens: The activity of soil organisms, including helpful bacteria and fungus, is also influenced by the pH of the soil. The availability of nutrients and the general health of the soil can be affected by the presence of certain microbes, which flourish in particular pH ranges. Nutrient imbalances can result from extreme pH values. Aluminum and manganese toxicity may develop in strongly acidic soils (low pH), whereas calcium and magnesium shortages may be frequent in highly alkaline soils (high pH).

In hydroponic systems: In hydroponic systems, proper pH levels guarantee that plant roots receive the maximum amount of nutrients. Each nutrient has a specific pH range within which it is most readily absorbed by plants. Nutrient imbalances brought on by pH variations might result in toxicities or nutrient shortages. Additionally, pH has an impact on how soluble and stable nutrients are in the hydroponic solution. The availability of some nutrients may be limited and the possibility of system clogging if the pH is too high or too low, causing certain nutrients to precipitate or become unstable. At a low pH level, trace nutrients are absorbed toxically while macronutrients are deficient. Conversely, a high pH level can hinder the uptake of micronutrients, leading to deficiency as well.

A suitable growing medium with proper pH levels will allow plant roots to absorb necessary nutrients. However, each type of plant has different nutritional needs, so the pH concentration will vary. Growers need to be mindful of this to create a suitable environment for the development of plants.

pH in Coco Coir and its Impact on Plants

Coco coir has the ability to retain water while also being particularly good at draining water. The pH of coco coir is about 5.8 – 6.5. Most plants adapt well to a pH environment within 5.0 – 7.0, so coco coir is a standout growing medium suitable for many types of plants.

Processed coco coir creates a stable pH environment that is favorable to plant growth. What’s more important is that coco coir can maintain this balance and stability over time. This makes it easier for growers to control the pH level.

What pH levels are suitable for plants?

Each plant has different nutritional needs, so the pH level of the growing medium will also vary.

For hydroponic plants, the optimal pH level is between 5.0 – 7.0. Most vegetables such as tomatoes, parsley, beans, etc. are suitable for this environment.

For tomatoes, strawberries, and sweet potatoes: the suitable pH is about 5.5 – 6.5

Watermelon: suitable pH is about 6.2 – 6.5

Vegetables like cabbage, carrots, peppers, and onions: The suitable pH range is about 6.0 – 6.5

However, to achieve the best results, growers need to know the pH range of each plant to adjust it appropriately.

Stabilized pH Coco Coir Products

 What pH Levels are Suitable for Plants?

Testing pH levels in coco coir

Preparation: pH meter, coco coir, and fresh or demineralized water.

Step 1: Mix coco coir and water in the standard ratio of 1:1.5

Step 2: Mix well and wait for 1-2 minutes

Step 3: Use the pH meter to dip into the solution, then record the results

Step 4: Check the results to see if the coco coir pH has reached the standard (standard pH is from 5.8 – 6.5)

Above are the steps to test the coco coir pH. Growers should note that for ideal results, test multiple times and take an average.

The Importance of pH Levels in Coco Coir for Plant Growth

Maintaining Optimal pH levels in Coco Coir

The prominent feature of coco coir is its ability to maintain a stable and balanced pH level. With its high cation exchange capacity, it can also remove excess potassium and sodium from the medium. This is a beneficial trait for plants as it prevents an excess accumulation of potassium in the root zone.

However, to ensure optimal utilization of these advantages in hydroponic systems, growers should add a small amount of buffering agent and regularly check the pH level of the medium. The environment is always an essential factor for the growth of plants.

Factors that affect pH in coco coir

There are several factors that can affect the coco coir pH. Some of the main factors include:

  • Water quality and frequency of watering: The quality of the water used to water plants in coco coir can impact the growing medium’s pH level. Tap water, for example, can contain high levels of minerals that can increase the pH level over time. The frequency of watering can also influence the pH level of the coco coir. If the growing medium becomes too dry, it can cause a build-up of salts and increase the pH level.
  • Nutrients: The type of nutrients used in coco coir can also affect the pH level. Some nutrients can be acidic or alkaline, which can impact the pH level of the growing medium as they are added.
  • Substances buffered with coco coir: Different types of buffering agents can have different pH levels depending on their quality and source. It is important to choose high-quality coconut coir that has been properly washed and buffered to maintain a stable pH level.
  • It is important for growers to regularly test the coco coir pH and adjust it as needed to ensure optimal plant growth. Typically, the pH level in coco coir should be between 5.8 and 6.5 for most plants. By monitoring the factors that affect the coco coir pH, growers can ensure a stable and healthy growing environment for their plants.

How to adjust pH in coco coir

To adjust the coco coir pH, you can use acidic or alkaline solutions depending on whether the pH level is too high or too low. Here are some steps to adjust the pH level in coco coir:

  • Test the pH level: Use a pH meter or test strips to determine the current pH level in your coco coir. The ideal pH range for coco coir is between 5.8 and 6.5.
  • Determine the required adjustment: If the pH level is too high, you must lower it by adding an acidic solution. If the pH level is too low, you must raise it by adding an alkaline solution.
    • Acidic solution: To lower the pH level, you can use an acidic solution such as sulfuric acid or phosphoric acid. It is recommended to start with a small amount of the solution and then test the pH level again to avoid over-adjusting the pH level.
    • Alkaline solution: To raise the pH level, you can use an alkaline solution such as potassium hydroxide or calcium carbonate. Again, it is important to start with a small amount of the solution and then test the pH level to avoid over-adjusting the pH level.
  • Mix the solution: Mix the acidic or alkaline solution with water in a separate container before adding it to the coco coir. Be sure to mix the solution well to distribute it evenly throughout the growing medium.
  • Check the pH level again: After adding the acidic or alkaline solution, it is important to test the pH level of the coco coir again to ensure that it is within the desired range. Repeat the process as needed until the pH level is correct.

Remember that small adjustments are always better than large adjustments to avoid over-adjusting the pH level. It is also important to pay attention to the use of pH-balanced nutrients to avoid impacting the pH level of the growing medium.

Where to Buy High-quality Coco Coir with Stabilized ph

Coco Coir Global is a reputable manufacturer and supplier that offers customers coconut coir products not only of good quality but also at an affordable price. We are committed to providing products with clear origins and transparent manufacturing processes.

With the top priority being the quality and trust of our customers, we aim to bring the best products that meet the requirements of customers, ensuring their satisfaction when using our products.

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