How to Balance the pH for Wild Indigo Plants

Balancing the pH for wild indigo plants, specifically blue wild indigo (Baptisia australis), is crucial for their health and growth. The ideal pH range for wild indigo is slightly acidic to neutral, between 5.0 and 6.8. By following the steps outlined in this comprehensive guide, you can ensure your wild indigo plants thrive and produce vibrant blue flowers.

Soil Testing for Wild Indigo

Before planting your wild indigo, it’s essential to test the soil pH to ensure it falls within the ideal range. You can purchase a home testing kit or send a soil sample to a local extension service for professional analysis. This step will provide you with the necessary information to make informed decisions about amending the soil.

Adjusting the Soil pH for Wild Indigo

wild indigoImage source: Pixabay

If the soil pH is too high, above 6.8, you’ll need to lower it by adding elemental sulfur. The amount of sulfur required will depend on the current pH level and the desired target pH. Refer to the manufacturer’s instructions for the appropriate application rate.

On the other hand, if the soil pH is too low, below 5.0, you’ll need to raise it by adding lime. Again, the amount of lime required will depend on the current pH and the desired target pH. Follow the manufacturer’s guidelines for the correct application rate.

Planting Wild Indigo in the Ideal pH Range

Once you’ve adjusted the soil pH to the ideal range of 5.0 to 6.8, you can proceed with planting your wild indigo. Ensure the soil is well-draining and provide the plants with full sun or partial shade, depending on the specific variety’s requirements.

See also  How to Balance pH for White Lilies

Watering and Fertilizing Wild Indigo

wild indigo 2Image source: Pixabay

Wild indigo is relatively drought-tolerant, but it’s essential to provide consistent watering, especially during the first year of growth. Aim to give the plants about 1 inch of water every couple of weeks.

Regarding fertilization, wild indigo does not require frequent applications. In fact, excessive fertilizing can cause the plants to become leggy and flop over. If needed, use a balanced, slow-release fertilizer after the seedlings have a few sets of leaves.

Maintaining Wild Indigo’s pH Balance

To maintain the ideal pH range for your wild indigo plants, you may need to retest the soil periodically and make adjustments as necessary. Prune the plants after flowering to prevent the development of seed pods, and in late winter or early spring, cut back old foliage to improve the plant’s appearance.

By following these steps and maintaining the ideal pH range, you can ensure healthy growth and vibrant blue flowers in your wild indigo plants.


  1. Learn to Grow Bold, Beautiful Baptisia
  2. Baptisia (False or Wild Indigo)
  3. Blue Wild Indigo with Yellow Leaves
  4. How to Grow False Indigo from Seed
  5. How to Grow and Care for False Indigo