How to Acidify Soil

Acidifying soil can be necessary for plants that require a lower pH to thrive. Here are some ways to acidify soil:

1. Add elemental sulfur: Elemental sulfur can be added to soil to lower its pH. When sulfur is added to soil, it reacts with water and microorganisms in the soil to form sulfuric acid. This acid then lowers the pH of the soil. The amount of sulfur needed will depend on the soil's current pH and the desired pH level. It's important to note that sulfur takes time to work, so it's best to add it in the fall before planting in the spring.

2. Add aluminum sulfate: Aluminum sulfate can be added to soil to lower its pH. When aluminum sulfate dissolves in water, it releases aluminum ions, which acidify the soil. It's important to follow the instructions on the package when adding aluminum sulfate to soil, as too much can harm plants.

3. Use acidifying fertilizers: Some fertilizers are formulated to be acidic and can be used to lower soil pH. These fertilizers typically contain ammonium-based nitrogen sources, which release acidifying ions when they break down. It's important to follow the instructions on the fertilizer package and not over-fertilize, as this can harm plants.

4. Use organic matter: Some organic materials can help acidify soil, such as pine needles, peat moss, and composted leaves. These materials release organic acids as they break down, which lower soil pH. However, it's important to note that organic matter alone may not be enough to significantly lower soil pH.

It's important to regularly test soil pH to ensure that it remains at the desired level for the plants you are growing. Testing kits can be purchased at garden centers or through online retailers.