How to Balance pH for Sunrose Plants

Maintaining the proper pH level is crucial for the health and growth of sunrose plants. Sunrose, also known as Helianthemum, thrives in well-drained, slightly acidic soil with a pH range between 5.5 and 6.5. By creating a DIY potting mix and carefully monitoring the pH, you can ensure your sunrose plants receive the optimal growing conditions.

Preparing the DIY Potting Mix

To create a balanced potting mix for your sunrose plants, follow these steps:

  1. Base: Start with a high-quality all-purpose potting soil as the foundation. This provides the necessary nutrients and structure for your plants to thrive.

  2. Drainage Agents: Mix in perlite and coarse sand to improve aeration and drainage. The recommended ratio is 2 parts potting soil, 1 part perlite, and 1 part coarse sand.

  3. pH Regulator: Add peat moss to regulate the pH and manage moisture. Peat moss is a natural pH regulator and helps maintain a neutral to slightly acidic pH, which is ideal for sunrose plants.

  4. Mix Thoroughly: Ensure even distribution of all components for a consistent texture throughout the mix.

  5. Check Texture: The final mix should be light, crumbly, and moist, resembling a freshly baked cake. This texture is ideal for sunrose plants to establish their roots.

Adjusting the pH

sunroseImage source: Pixabay

Once you have created the potting mix, it’s essential to test and adjust the pH to ensure it falls within the optimal range for sunrose plants.

Testing the pH

You can use a digital pH meter or pH test strips to measure the pH of your potting mix. Follow the manufacturer’s instructions for accurate readings.

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Adjusting the pH

If the pH is too high (alkaline), you can lower it by adding sulfur or aluminum sulfate to the soil. If the pH is too low (acidic), you can raise it by adding lime or dolomitic limestone.

Here’s a guide on the amounts to use:

pH Adjustment Amount per Cubic Foot of Soil
Lower pH by 1 point 1-2 tablespoons of sulfur or aluminum sulfate
Raise pH by 1 point 2-4 tablespoons of lime or dolomitic limestone

After making the adjustments, mix the soil thoroughly and retest the pH. Repeat the process until the desired pH range is achieved.

Ongoing Maintenance

Regularly monitor the pH of your sunrose plants’ soil and make adjustments as needed. Factors such as watering, fertilizer use, and environmental conditions can affect the soil’s pH over time.


Sunrose plants prefer well-drained soil and should be watered when the top inch of soil becomes dry. Avoid overwatering, as this can lead to root rot and other issues.


Use a balanced, slow-release fertilizer formulated for acid-loving plants. Apply the fertilizer according to the manufacturer’s instructions, typically in early spring and mid-summer.

Temperature and Sunlight

Sunrose plants thrive in full sun and prefer temperatures between 65°F and 75°F (18°C and 24°C). Avoid exposing them to extreme heat or cold, as this can stress the plants and affect their growth.

By following these guidelines, you can create the perfect growing environment for your sunrose plants and ensure they thrive for years to come.


sunrose 2Image source: Pixabay

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