How To Change Hydrangeas’ Color?

Hydrangeas can change their color in just a few simple steps. A lower pH level allows aluminum to be soluble and absorbed by plants, resulting in blue flowers. However, it is possible to change the color of pink and blue varieties of hydrangeas by simply altering the pH level of your growing soil. To do this, use diluted aluminum sulfate to increase the pH.

Hydrophosis is the most common method for changing the color of hydrangeas. Acidic soil changes some hydrangeas to grow blue flowers, while alkaline soil changes them to pink. Neutral soil allows hydrangeas to revert to a color in the middle. To change the color of hydrangeas, adjust the soil’s pH levels. Start by using a purchased soil test kit to find your pH or send a soil sample to many county offices.

Bigleaf and mountain hydrangeas can shift from pink to purple or blue depending on the soil pH and the presence of aluminum. Aluminum is a naturally occurring element that can change the color of hydrangeas. To change blue-blooming hydrangeas to red-blooming, add lime (calcium hydroxide, Ca(OH)2) to create basic soil. Coffee grounds can also change soil by making it more acidic, causing hydrangeas to turn blue, while more alkaline soils make blooms pink.

In a two-week period, flowers will start to alter their color. To change the color of hydrangea flowers from pink to blue, add aluminum sulfate to the soil around the plant. The easiest way to acidify your soil and turn those blooms blue is with aluminum sulfate, which can be found at almost any garden center.