How to Raise Soil pH in Potted Plants

Soil pH is a crucial factor in plant growth, affecting nutrient absorption and overall health. Most plants prefer a slightly acidic soil with a pH range of 6.0 to 7.0. However, when the soil becomes too acidic or has a pH below 6.0, it can adversely affect plant growth. Here are some effective ways to raise soil pH in potted plants:

1. Test the Soil pH

Before you start making any changes to the soil, it is essential to check the pH level to determine how much it needs to be raised. You can use a soil pH tester kit or send a soil sample to a testing lab for accurate results. Once you know the pH level, you can tailor your approach to suit your plants' needs.

2. Add Lime

One of the most effective ways to raise soil pH in potted plants is by adding lime. Lime is a natural alkaline substance that neutralizes soil acidity and increases the pH level. To apply lime, mix it into the soil thoroughly, ensuring that it is evenly distributed. The amount of lime you need will depend on the amount of soil in your pot and the current pH level. Follow the package instructions for best results.

3. Use Wood Ash

Wood ash is another natural substance that can raise soil pH. It is rich in calcium carbonate, a compound that neutralizes soil acidity. Wood ash should be used sparingly, as too much can harm plants. To use wood ash, sprinkle a small amount over the soil and mix it in. Monitor your plant closely for signs of stress or damage, and stop using wood ash if you notice any adverse effects.

4. Use Dolomitic Limestone

Dolomitic limestone is a type of lime that contains magnesium in addition to calcium carbonate. It is particularly effective in raising soil pH in potted plants. Dolomitic limestone slowly releases its alkaline compounds over time, providing sustained pH adjustment. Simply mix the required amount of dolomitic limestone into the soil, following the package instructions.

5. Add Baking Soda

Baking soda is another option to raise soil pH, but it should be used with caution. Baking soda is a strong alkaline substance that can raise the pH level too quickly and harm plants. To use baking soda, mix a small amount into the soil, making sure it is evenly distributed. Monitor the plant closely and stop using baking soda if you notice any adverse effects.

6. Reduce Acidic Fertilizers

If you regularly use acidic fertilizers, they may be contributing to the soil's acidity. To raise soil pH, reduce or eliminate the use of acidic fertilizers and opt instead for neutral or alkaline fertilizers. You can also incorporate organic matter, such as compost, into the soil to help neutralize acidity naturally.

Conclusion

Raising soil pH in potted plants requires careful attention to the plant's needs and the type of soil you are working with. By following the tips above, you can effectively neutralize soil acidity and promote healthy plant growth. Remember to monitor your plants closely and make adjustments as needed to ensure success.