Is Acidic Soil Good for Plants?

Soil acidity is measured using the pH scale, which ranges from 0 to 14. Neutral soil registers at 7.0 on the pH scale, while acidic soil has a pH less than 7.0. When the soil pH drops below 5.5, it is considered highly acidic. Acidic soil is common in areas with high rainfall or in regions that are prone to acidic geologic formations or acidic atmospheric deposits.

The Advantages of Acidic Soil for Plants

Some plants prefer an acidic soil environment. These plants include blueberries, pine trees, azaleas, and rhododendrons. Soil acidity promotes the availability of essential plant nutrients such as iron, magnesium, and manganese. These nutrients are more easily dissolved and absorbed by plant roots in acidic soil. Additionally, acidic soil inhibits the growth of harmful bacteria and fungi that can damage plants.

The Disadvantages of Acidic Soil for Plants

While some plants thrive in acidic soil conditions, many others do not. Broad statements about whether acidic soil is good for plants must take into account the specific plants being grown. Most garden vegetables, for example, prefer a soil pH between 6.0 and 7.0. When soil pH drops below 5.5, many essential plant nutrients become unavailable, limiting plant growth and production. Additionally, soil acidity can stunt root growth and damage the delicate hairs that act as the primary nutrient absorbers.

How to Test and Adjust Soil Acidity

The easiest way to determine soil acidity is to purchase a soil pH testing kit from a garden center or to send a soil sample to a professional laboratory. Once you have determined your soil's pH level, you can take steps to adjust it. For mildly acidic soils, adding lime at a rate of two to three pounds per 100 square feet can raise the pH level. For highly acidic soils, sulfur can be added at a rate of one to three pounds per 100 square feet to lower the soil pH. It is important to note that adjusting soil pH is a gradual process and should be done over time.

Conclusion

Whether acidic soil is good for plants depends on the specific plants being grown. Some plants thrive in acidic soil conditions, while others do not. Basic soil testing can determine your soil's pH level and help you decide what steps to take to improve soil quality for the plants you want to grow. With some effort to adjust soil acidity and plant selection, you can create a garden that is beautiful and productive.