1、 How to change the color of Hydrangea

1. Aluminum sulfate: to make Hydrangea change color, we usually make the pink hydrangea turn blue. We need to reduce the pH value of the soil and use aluminum sulfate for color matching. When the bud of Hydrangea just comes out, take 2-3g aluminum sulfate and mix 1L water. Water the flowers every 10 days. Usually apply it 3-4 times, and the hydrangea can produce blue flowers

2. Blue adjusting agent: when aluminum sulfate is used to adjust the blue, it is easy to master the time and dosage of blue adjusting agent. Novices suggest that when Hydrangea sprouts in spring, sprinkle a layer of Hydrangea blue adjusting agent on the surface of the basin soil. After that, with the watering, the effective components will be dissolved into the soil with the water to change the pH value of the soil, so as to change the flower color of hydrangea. The bluening agent will be sprinkled every two months

2、 Causes of Hydrangea discoloration

1. The reason for Hydrangea discoloration is the change of soil pH. when the soil pH value is 4-6, Hydrangea blooms blue. When the soil pH value is greater than 7.5, Hydrangea blooms red. In the process of soil pH value change, Hydrangea will change in different colors, such as purple and pink

2. In addition to the influence of soil pH, the cause of Hydrangea discoloration will also change with the blooming time of hydrangea. For example, pink or Blue Hydrangea will slowly turn green until the hydrangea completely withers and decays