Why is a layer of Expanded Clay added to the bottom of the pots?
Introduction:
When it comes to caring for our potted plants, there is a little trick that can make a big difference in their health and growth: adding a layer of expanded clay to the bottom of the pots. This method is not only simple but also highly beneficial for our plants.
What is Expanded Clay?
Expanded clay are small balls of fired clay that have been exposed to high temperatures, causing them to expand and become porous. This material is light, airy and capable of retaining water and nutrients.
Benefits of Expanded Clay in Pots:
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Improves Drainage: The main advantage of using expanded clay in the bottom of pots is that it improves drainage. This prevents waterlogging and reduces the risk of root rot, which is common in poorly drained soil.
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Prevents Root Asphyxiation: Expanded clay creates a space at the bottom of the pot that allows the roots of the plant to breathe better. This is vital for their growth and overall health.
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Regulates Moisture: Although expanded clay improves drainage, it also helps retain a certain amount of moisture. This is particularly useful for plants that require a constant moisture balance.
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Reduces the Weight of Pots: The lightness of expanded clay helps reduce the overall weight of pots, which is useful for large pots or for balcony gardens where weight can be an issue.
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Promotes a Healthy Root Environment: The porous structure of expanded clay promotes an oxygen-rich environment around the roots, which is essential for their growth and efficient nutrient absorption.
How to Use Expanded Clay in Pots:
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Before adding soil, place a layer of expanded clay at the bottom of the pot. The amount will depend on the size of the pot, but a layer of about 2-3 cm is usually sufficient.
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Add soil and plant as you normally would. The expanded clay will act as a drainage barrier between the soil and the drainage holes of the pot.
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When watering, excess water will flow into the expanded clay layer, away from the roots of the plant.
Conclusion:
Incorporating expanded clay into the bottom of your pots is a simple but effective practice to improve the health and growth of your plants. By improving drainage, preventing root suffocation, and regulating humidity, this technique ensures that your plants are in an optimal environment to thrive. A substitute product that works very well is volcanic gravel.