How to Balance pH for Geranium Sanguineum: A Comprehensive Guide

Geranium sanguineum, commonly known as Bloody cranesbill, is a beautiful and hardy perennial that adds a vibrant touch to any garden. To ensure its optimal growth and health, it is crucial to maintain the ideal soil pH range for this plant. In this comprehensive guide, we will walk you through the steps to balance the pH for Geranium sanguineum, including soil testing, amendments, fertilizer selection, and ongoing care.

What Is the Ideal pH Range for Geranium Sanguineum?

Geranium sanguineum thrives in slightly acidic to neutral soil, with an optimal pH range of 6.0 to 7.0. When the soil pH falls outside this range, the plant may experience nutrient deficiencies, stunted growth, and other health issues. Therefore, it is essential to regularly monitor and adjust the soil pH to keep your Geranium sanguineum happy and healthy.

How to Test Soil pH for Geranium Sanguineum

Geranium sanguineum

Before planting Geranium sanguineum or if you suspect pH imbalances, it is crucial to test the soil pH. You can use a home testing kit or send a soil sample to your local extension service for analysis. Home testing kits are readily available at garden centers and online retailers. They typically involve mixing a small amount of soil with water and using a color-coded chart to determine the pH level.

To collect a soil sample for testing:

  1. Use a clean trowel or spade to dig a small hole, about 6 inches deep, near the planting area.
  2. Remove any debris, grass, or roots from the soil sample.
  3. Place the soil in a clean container and mix it thoroughly.
  4. Follow the instructions provided with your home testing kit or send the sample to your local extension service for analysis.
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How to Amend Soil pH for Geranium Sanguineum

If the soil pH test reveals that the pH is below 6.0, you will need to amend the soil to raise the pH. The most common amendment for raising soil pH is lime. The amount of lime required will depend on the initial pH and the type of lime used.

For example, if you are using flowable limestone, you can add 4 quarts per 100 gallons of soil to raise the pH by a full point. If you are using granular limestone, you may need to use more product to achieve the same effect.

To amend the soil:

  1. Determine the amount of lime needed based on your soil test results and the product instructions.
  2. Spread the lime evenly over the planting area, using a rake to incorporate it into the top 6 inches of soil.
  3. Water the area thoroughly to help the lime dissolve and distribute throughout the soil.
  4. Wait at least two weeks before retesting the soil pH to allow the lime to take effect.

What Fertilizer to Use for Geranium Sanguineum

Geranium sanguineum 2

When selecting a fertilizer for Geranium sanguineum, choose a balanced, granular fertilizer with a pH closer to neutral. Fertilizers with a high ammonium content can lower the soil pH over time, while alkaline fertilizers can help raise it.

A balanced fertilizer with an NPK ratio of 10-10-10 or 12-12-12 is suitable for Geranium sanguineum. Apply the fertilizer according to the package instructions, typically once in early spring and again in mid-summer.

How to Monitor and Maintain Soil pH for Geranium Sanguineum

To ensure the long-term health of your Geranium sanguineum, it is essential to regularly monitor and maintain the soil pH. Use a pH meter or test kit to check the soil pH every 4-6 weeks during the growing season.

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If the pH begins to drift outside the ideal range, take corrective action by adding lime to raise the pH or sulfur to lower it. Be sure to follow the product instructions carefully and avoid over-applying amendments, as this can cause more harm than good.

In addition to monitoring soil pH, provide your Geranium sanguineum with adequate water, fertilizer, and sunlight to promote healthy growth and blooming. Water the plant deeply and regularly, especially during dry spells, and ensure it receives at least 6 hours of direct sunlight per day.

How Long Does It Take to Balance Soil pH for Geranium Sanguineum?

The time required to balance soil pH for Geranium sanguineum depends on several factors, including the initial pH, the type and amount of amendments used, and environmental conditions. In general, it may take several weeks to a few months for the soil pH to stabilize after amending.

After applying lime to raise the pH, wait at least two weeks before retesting the soil. If the pH is still too low, you may need to apply additional lime and retest again in another two weeks. Continue this process until the pH reaches the desired range.

It is important to be patient and consistent when balancing soil pH. Avoid making drastic changes or over-applying amendments, as this can cause pH fluctuations that may stress the plant.

Home Remedies for Balancing Soil pH for Geranium Sanguineum

In addition to commercial amendments, there are several home remedies you can use to balance soil pH for Geranium sanguineum:

  1. Wood Ash: Wood ash from a fireplace or wood stove can help raise soil pH. Apply a thin layer (about 1/4 inch) of ash evenly over the planting area and work it into the top 6 inches of soil. Use caution, as wood ash is highly alkaline and can cause rapid pH changes if over-applied.

  2. Eggshells: Crushed eggshells can help raise soil pH gradually. Rinse and dry the eggshells, then crush them into a fine powder. Sprinkle the powder around the base of the plant and work it into the top inch of soil. Repeat this process every 4-6 weeks during the growing season.

  3. Baking Soda: Baking soda can be used as a temporary solution to raise soil pH. Mix 1 tablespoon of baking soda with 1 gallon of water and apply the solution to the soil around the plant. Use this method sparingly, as frequent applications can lead to salt buildup in the soil.

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Remember to always test the soil pH before and after applying any home remedies to ensure you are making the necessary adjustments.


Balancing soil pH is crucial for the health and vitality of Geranium sanguineum. By following the steps outlined in this comprehensive guide, including soil testing, amending, fertilizer selection, and ongoing monitoring, you can create the ideal growing conditions for this beautiful perennial. With proper care and attention, your Geranium sanguineum will thrive and provide vibrant blooms for years to come.


  1. How to Grow True Perennial Geraniums
  2. How to Grow Geranium (Cranesbill)
  3. Low pH Symptoms Showing Up on Geraniums in Greenhouses
  4. Cause of pH Drop in Geranium
  5. Geranium sanguineum Care Guide