How to Change Hydrangea Plant Colors

HOMESTEAD HOW-TO

1

Aluminum Sulphate

Aluminum sulfate makes the soil more acidic and provides aluminum, a key element needed for blue blooms.

2

Garden Lime

Garden lime raises the soil’s pH, making it more alkaline and encouraging pink hydrangea blooms.

3

Organic Compost

Compost improves soil health while gradually lowering pH over time. 

4

Elemental Sulfur

For a long-term way to acidify the soil and stimulate beautiful blue hydrangea flowers, sprinkle 1 to 2 tablespoons of elemental sulfur per square foot of soil and mix it into the top few inches.

5

Wood Ash

Wood ash neutralizes acids and increases soil alkalinity, encouraging pink blooms on your hydrangeas. 

6

Diluted Vinegar

This method is ideal if you’re looking for a short-term adjustment, but it will need to be reapplied every few weeks. Avoid splashing the leaves to prevent potential damage.

7

Coffee Grounds

Scatter used coffee grounds around the base of your hydrangeas and gently work them into the topsoil to lower soil pH over time and provide a slight nitrogen boost.