How to Balance pH for Scarlet Pimpernel: A Comprehensive Guide

Maintaining the optimal pH level is crucial for the healthy growth and development of Scarlet Pimpernel (Anagallis arvensis), a vibrant wildflower known for its bright red or blue blooms. This comprehensive guide will walk you through the step-by-step process of balancing the pH for Scarlet Pimpernel, ensuring your plants thrive in your garden.

Soil Testing: The First Step

Before making any adjustments to the soil, it’s essential to test the pH level. You can purchase a home soil testing kit or contact your local Cooperative Extension Service to have a sample analyzed. Knowing the current pH level will help you determine the appropriate amendments needed to achieve the desired range.

Adjusting the Soil pH

scarlet pimpernelImage source: Pixabay

Scarlet Pimpernel prefers a slightly acidic to neutral soil pH, typically between 6.0 and 7.0. If your soil test reveals a pH outside this range, you’ll need to make the necessary adjustments.

Lowering the pH (Acidic Soil)

If your soil is too alkaline, with a pH above 7.0, you’ll need to lower the pH by adding acidic amendments. Some effective options include:

  • Elemental sulfur: Apply at a rate of 1-2 pounds per 100 square feet of garden area.
  • Aluminum sulfate: Use at a rate of 1-2 pounds per 100 square feet.
  • Organic matter: Incorporate compost, peat moss, or well-rotted leaves to increase the soil’s acidity.

Follow the product instructions carefully and retest the soil after a few months to ensure the pH has reached the desired level.

Raising the pH (Acidic Soil)

If your soil is too acidic, with a pH below 6.0, you’ll need to raise the pH by adding alkaline amendments. Some options include:

  • Lime (calcium carbonate): Apply at a rate of 2-4 pounds per 100 square feet.
  • Wood ash: Sprinkle a thin layer over the soil, about 1/2 cup per square foot.
  • Dolomitic lime: Use at a rate of 2-4 pounds per 100 square feet.
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Again, follow the product instructions and retest the soil after a few months to confirm the pH is within the optimal range.

Maintaining the Ideal pH

Once you’ve adjusted the soil pH, it’s essential to monitor it regularly to ensure it stays within the desired range. Retest the soil every 6-12 months and make additional amendments as needed.

Caring for Scarlet Pimpernel

scarlet pimpernel 2Image source: Pixabay

In addition to balancing the soil pH, there are other important factors to consider when growing Scarlet Pimpernel:

Sunlight and Shade

Scarlet Pimpernel thrives in partial shade to full sun, so choose a planting location that provides the appropriate light conditions.


Ensure the plant receives about 1 inch of rain per week during the growing season. Use a rain gauge to monitor and supplement with additional water if needed.


After new growth appears, apply a light, slow-release fertilizer to provide the necessary nutrients. Avoid using high-nitrogen fertilizers, as they may encourage root rot.

Pest and Disease Control

Keep an eye out for common pests and diseases that may affect Scarlet Pimpernel, and address any issues promptly. Consult your local Cooperative Extension Service for recommended control methods.


Balancing the pH for Scarlet Pimpernel is a crucial step in ensuring the plant’s optimal growth and development. By following the guidelines outlined in this comprehensive guide, you can create the ideal soil conditions for your Scarlet Pimpernel to thrive and produce its vibrant, eye-catching blooms.


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