How Do I Lower the pH in My Potted Plants?

When it comes to gardening, pH is an important factor to consider. pH is a measure of the acidity or alkalinity of the soil, and the majority of plants prefer a pH between 6.0 and 7.5. However, if your potted plants are suffering and you suspect that the pH level is too high, there are several things you can do to lower it.

Test the Soil pH

The first step in lowering the pH of your potted plants is to test the soil to confirm the pH level. You can purchase a pH test kit from a garden center or online, or you can take a soil sample to a soil testing lab. Once you know the pH level, you can take steps to adjust it.

Use Acidic Fertilizers

If the soil pH is only slightly above the desired range, you can use acidic fertilizers to lower it. Acidic fertilizers, such as those made for rhododendrons or azaleas, contain sulfur or other acidifying agents that help to lower the soil pH. Be sure to follow the package directions carefully, as too much fertilizer can damage the plants.

Add Organic Matter

If the pH of the soil is moderately high, adding organic matter can help to lower it. Organic matter, such as compost or peat moss, is slightly acidic and can help to lower the pH of the soil over time. Mix the organic matter into the soil before planting, or spread it on top of the soil and water it in. Repeat this process periodically to maintain the desired pH level.

Use Sulfur

If the pH of the soil is very high, sulfur may be necessary to lower it. Sulfur is a slow-acting but effective acidifier that should be added to the soil several months before planting. Apply it according to the package directions, and be sure to mix it into the soil thoroughly. Overuse of sulfur can be harmful to plants, so be careful not to add too much.

Use Vinegar

If you need a quick fix for a slightly high pH level, you can use vinegar to acidify the soil. Mix one tablespoon of vinegar with one gallon of water and water the plants with the mixture. Be sure not to overuse vinegar, as it can burn the plants if used too frequently.

Conclusion

Lowering the pH of your potted plants may take some effort, but it can make a significant difference in the health of your plants. By testing the soil pH, using acidic fertilizers or organic matter, and occasionally using sulfur or vinegar, you can ensure that your plants are getting the proper nutrients and that they are growing in the optimal pH range.