The Little-Known Trick to Making Your Hydrangeas Change Color

The Little-Known Trick to Making Your Hydrangeas Change Color

Welcome to our comprehensive guide on an often overlooked trick that can help you achieve stunning color transformations in your hydrangeas. If you’re an avid gardener or simply have a love for these beautiful flowering plants, you’ve probably wondered how to manipulate their colors. In this article, we’ll reveal the secrets to making your hydrangeas change color and provide you with expert tips and techniques to achieve the desired results.

The Little-Known Trick to Making Your Hydrangeas Change Color

Understanding Hydrangea Colors

Before diving into the trick, let’s briefly explore the natural color variations of hydrangeas. Hydrangeas typically come in shades of blue, pink, purple, and white. The color of the flowers is determined by the pH level of the soil in which they are planted.

  • Blue hydrangeas thrive in acidic soil with a pH level of around 5.5 or lower.
  • Pink hydrangeas prefer alkaline soil with a pH level of around 6.5 or higher.
  • Purple hydrangeas fall somewhere in between, thriving in slightly acidic to neutral soil.
  • White hydrangeas are not influenced by soil pH and maintain their color regardless.

The Trick: Changing the Soil pH

Now that we understand the correlation between soil pH and hydrangea colors, let’s explore the little-known trick to manipulating the pH level and achieving the desired color transformation.

Step 1: Testing the Soil pH

The first and most crucial step is to determine the current pH level of your soil. You can easily do this by using a soil testing kit available at most garden centers or through online retailers. Follow the instructions provided with the kit to obtain an accurate reading of your soil’s pH.

Step 2: Adjusting the Soil pH for Blue Hydrangeas

If you desire vibrant blue hydrangea blooms, you’ll need to lower the pH level of your soil. Here’s how you can achieve this:

  1. Add sulfur: Incorporate elemental sulfur into the soil to gradually lower its pH level. Follow the recommended application rates based on the soil test results and the package instructions.
  2. Use acidic fertilizers: Opt for fertilizers specifically formulated for acid-loving plants, such as those containing ammonium sulfate. These fertilizers will contribute to further lowering the pH over time.
  3. Mulch with organic matter: Apply a layer of organic mulch, such as pine needles or coffee grounds, around the base of your hydrangeas. This will help maintain the desired acidity in the soil.

Step 3: Adjusting the Soil pH for Pink Hydrangeas

If you’re aiming for delicate pink hydrangea blooms, you’ll need to raise the pH level of your soil. Follow these steps to achieve this:

  1. Apply lime: Incorporate dolomitic lime into the soil to gradually increase its pH level. Again, refer to the soil test results and package instructions for the recommended application rates.
  2. Use alkaline fertilizers: Choose fertilizers with a high phosphorus content and a low nitrogen content. These fertilizers will help raise the soil’s pH level and promote pink blooms.
  3. Avoid aluminum sulfate: Pink hydrangeas tend to be sensitive to aluminum sulfate, so refrain from using it in your gardening practices.

Step 4: Monitoring and Maintaining pH Levels

After adjusting the soil pH to your desired range, it’s important to monitor and maintain the pH levels to ensure consistent bloom colors. Regularly test the soil using pH testing kits and make necessary adjustments accordingly. Remember that it may take some time for the changes to fully manifest in your hydrangeas, so be patient and consistent in your efforts.


Congratulations! You now possess the knowledge and tools to make your hydrangeas change color with precision. By understanding the relationship between soil pH and hydrangea colors, and following our step-by-step guide, you can transform your garden into a vibrant, visually stunning display of nature’s beauty. Experiment with different color variations and enjoy the sense of accomplishment that comes with successfully manipulating your hydrangea blooms. Happy gardening!

Remember, while this trick is effective in changing hydrangea colors, it’s important to consider other factors such as proper hydration, sunlight exposure, and overall plant health for optimal growth and blooming. By combining this little-known trick with proper care, you’ll be well on your way to creating a breathtaking floral masterpiece in your own backyard.