Hydrangeas are a beautiful and interesting plant. They change their color based on their environment. If you desire to change the color of your blue or pink hydrangea, read the following steps to help guide you in your efforts of changing an alkaline (pink) to acidic (blue) and acidic to alkaline.
Instructions
Pink to Blue
1. Test the water's pH levels that you typically use to water your plants. It needs to be around 5.6.
2. Lower the pH levels in the plant. This is done by increasing the aluminum in the soil.
3. Mix 1 tbsp of aluminum sulphate and 1 gallon of water.
4. Water the plant with this mixture 2 to 3 times during the summer months.
5. Check the soil's acidity. To change pink to blue, you need a 5.2-5.5 pH reading.
6. Fertilize the plant with one that is low in phosphorus and high in potassium.
7. Add coffee grounds, fruit and vegetable peelings and grass clippings to the plants soil to help change the pH levels as needed.
Blue to Pink
8. Check the plant's pH. It needs to be between 6 and 6.2 to change its color from blue to pink.
9. Raise the pH levels by adding limestone to the soil.
10. Fertilize the hydrangea with fertilizer high in phosphorus.
11. Add wood ashes to the soil if you still need to adjust the levels.
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