How to Balance pH for Nemesia Plants

Balancing the pH for Nemesia plants is crucial for their optimal growth and health. Nemesia plants thrive in slightly acidic soil with a pH range of 4.0 to 6.0. By adjusting the pH of the growing medium, monitoring the levels, and using appropriate fertilizers and treatments, you can ensure your Nemesia plants receive the right nutrients and flourish. This comprehensive guide will walk you through the steps to balance the pH for your Nemesia plants.

Adjusting the pH of the Growing Medium

The first step in balancing the pH for Nemesia plants is to test the pH of the growing medium. You can use a soil test kit or take a sample to a local nursery or extension office for analysis. Once you have the pH reading, you can take the necessary steps to adjust it.

Lowering the pH

If the pH is too high (alkaline), you’ll need to lower it. To do this, you can use an acidic fertilizer like 20-10-20 or an acid water drench with sulfuric acid. Aim to achieve a pH range of 4.0 to 4.5 for optimal Nemesia growth.

Raising the pH

If the pH is too low (acidic), you’ll need to raise it. You can use flowable lime, hydrated lime, or potassium bicarbonate to increase the pH. Aim for a pH range of 5.5 to 6.0.

Monitoring pH Levels

nemesiaImage source: Pixabay

Regularly testing the pH and electroconductivity (EC) of the growing medium is crucial. This will help you identify any issues and make the necessary adjustments. If you notice symptoms of high media-pH induced iron deficiency, it’s a good indication that the pH needs to be lowered.

See also  How to Balance the pH for Thunbergia Plants

Fertilizers and Treatments

Using the right fertilizers and treatments can also help balance the pH for Nemesia plants. Consider using a high-ammonium fertilizer like 21-7-7 to quickly turn a crop around, especially for iron-inefficient crops like Nemesia. If the pH is not coming down below 6, you can try an iron sulfate drench to lower the media-pH within a day or two.

Home Remedies

nemesia 2Image source: Pixabay

For home growers, using vinegar as a pH adjuster can be an option. Adding a small amount of vinegar to the watering can help lower the pH. However, be cautious with the amount, as too much vinegar can harm the plants.

Environmental Factors

Keep in mind that factors like the alkalinity of the water, lime in the media, type of fertilizer used, and the plant’s roots can affect the pH of the growing medium. Regularly test and adjust these factors to maintain the optimum pH range.


Balancing the pH for Nemesia plants is essential for their overall health and growth. By following the steps outlined in this guide, you can ensure your Nemesia plants receive the right nutrients and thrive in your garden or greenhouse. Remember to regularly monitor the pH levels and make adjustments as needed to keep your Nemesia plants happy and healthy.


  1. e-GRO Alert – 2015: pH Management
  2. Controlling Your Growing Media pH – GrowerTalks
  3. Understanding Plant Nutrition: High ph Problems – Greenhouse Grower