How to Balance pH for Vinca Minor

Maintaining the optimal pH range is crucial for the healthy growth and vibrant appearance of Vinca minor. This guide will provide you with step-by-step instructions on how to balance the pH for your Vinca minor plants, ensuring they thrive in your garden.

Understanding Vinca Minor’s pH Preferences

Vinca minor, also known as Periwinkle, is a hardy and versatile ground cover that prefers a soil pH between 5.0 and 8.0. However, it is particularly sensitive to high pH levels, often exhibiting micronutrient deficiencies when grown in soilless mixes with a pH above 6.3.

Soil Testing

vinca minorImage source: Pixabay

The first step in balancing the pH for Vinca minor is to test the soil. You can use a home testing kit or send a soil sample to a local extension service for a more comprehensive analysis. This will provide you with the current pH level of your soil, allowing you to determine the necessary adjustments.

Adjusting the pH

If your soil test reveals a pH above 6.3, you’ll need to lower the pH to create the optimal growing conditions for your Vinca minor plants. Here are some effective methods to adjust the pH:

Using Elemental Sulfur

Elemental sulfur is a common and effective way to lower soil pH. Apply it according to the package instructions, taking into account your soil test results and the desired pH range. Generally, you’ll need to apply 1-2 pounds of elemental sulfur per 100 square feet of garden space to lower the pH by 1 unit.

Applying Sulfuric Acid

Sulfuric acid is another option for lowering soil pH. It’s a more potent acidifier than elemental sulfur, so it’s important to follow the manufacturer’s instructions carefully. Start with a small amount and monitor the results, as over-application can harm your plants.

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Using Commercial Soil Acidifiers

Many garden centers and nurseries offer commercial soil acidifiers specifically formulated for adjusting pH. These products often contain a combination of ingredients, such as sulfur and aluminum sulfate, to effectively lower the soil pH. Follow the product’s application guidelines based on your soil test results.

Monitoring the pH

vinca minor 2Image source: Pixabay

After adjusting the pH, it’s crucial to monitor it regularly using a home testing kit. Soil pH can rise for four to six weeks after transplanting, so check it frequently during this period to ensure the optimal range is maintained.

Fertilization and Watering

Alongside pH adjustments, proper fertilization and watering can also help maintain the ideal growing conditions for Vinca minor.


Use a balanced 10-10-10 fertilizer to promote better blooming and a more vibrant green foliage. Apply the fertilizer monthly during the growing season or when first establishing the plants, following the packaging instructions to avoid over-fertilization.


Water the Vinca minor plants well after each fertilizer application to help the nutrients reach the roots. Vinca minor prefers moist soils but is drought-tolerant once mature.

Protective Measures

When handling chemical fertilizers or soil amendments, always wear protective gloves and a face mask. Closely follow all directions and storage guidelines provided on the product labels.


By following these steps to balance the pH for your Vinca minor plants, you can create the ideal growing conditions and enjoy a lush, thriving ground cover in your garden. Remember to test the soil, adjust the pH as needed, monitor the changes, and provide proper care through fertilization and watering. With the right pH balance, your Vinca minor will reward you with a vibrant and healthy display.

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Vinca Minor: How to Grow and Care for Periwinkle
Adjusting Soil pH for Healthier Plants
Soil pH and Nutrient Availability