How to Balance pH for Lily of the Nile

To maintain the optimal pH for Lily of the Nile (Agapanthus spp.), you need to keep the soil slightly acidic to neutral, with a pH range of 6.0 to 7.0. This step-by-step guide provides advanced, hands-on details and home remedies to help you achieve the perfect pH balance for your Lily of the Nile plants.

Soil pH Testing

Before adjusting the pH, it’s crucial to test your soil to determine its current pH level. You can purchase a soil test kit from a garden center or online and follow the instructions provided to get an accurate reading.

Soil Amendments

lily of the nileImage source: Pixabay

Lowering Soil pH

If your soil pH is too alkaline, you’ll need to add elemental sulfur to lower it. For every 1 point decrease in pH, add 0.06 ounces (1.7 grams) of elemental sulfur per square foot of soil.

Raising Soil pH

If your soil pH is too acidic, you’ll need to add ground limestone to raise it. For every 1 point increase in pH, add 2.2 ounces (62 grams) of ground limestone per square foot of soil.

Waiting and Retesting

After amending your soil, wait for about 6-8 weeks before retesting the pH. This allows the soil to adjust to the added amendments.

Maintaining pH

lily of the nile 2Image source: Pixabay

To maintain the desired pH range, incorporate organic matter such as compost or well-rotted manure into your soil. This improves drainage and fertility while helping to maintain a stable pH level.

Monitoring pH

Regularly monitor your soil pH to ensure it remains within the desired range. Adjust as necessary using the methods described above.

See also  How to Balance pH for White Beardtongue Plants

Additional Tips

  • Plant Agapanthus africanus, which prefers slightly acidic soil with a pH between 5.5 to 6.5, in a separate area from other Agapanthus species that grow well in neutral soil.
  • Use a fertile, well-draining potting mix and a container with drainage holes if growing Agapanthus in pots.
  • Water consistently, providing 1 inch per week until plants are established, then reduce to 1/2 inch per week. Agapanthus are drought resistant and won’t tolerate standing water.
  • Provide full sun, six to eight hours daily, to produce better blooms. In hot climates, plants benefit from afternoon shade.
  • Fertilize twice a year, either after blooming in early fall or in early spring, using a low-nitrogen, complete fertilizer that includes phosphorus, such as 5-10-15 or 8-8-8.

By following these steps, you can ensure your Lily of the Nile plants thrive in the perfect pH-balanced soil, resulting in vibrant, healthy blooms.


  1. How to Plant, Grow and Care for Agapanthus – The Spruce
  2. Lily of the Nile Care: Tips for Vibrant Blooms | – MyHomeBasedLife
  3. Learn How To Plant, Care and Grow Bountiful Agapanthus –
  4. Tips and Tricks for Growing Lily of the Nile – [email protected]