If you have hydrangeas in your garden, you may have noticed that the color of the hydrangea suddenly changes in the year after purchase. So it is quite possible that you buy a blue-flowering hydrangea and the following year it will bloom pink. But how does that come and how can you do it Color of hydrangeas to change?
Soil pH is to blame
This is not magic, but is due to the pH value of the soil. That means: the more acidic the soil, i.e. the lower the pH value, the more blue the plant blooms. Garden soil usually has a pH of six to seven. However, a pH value of around five would be ideal.
Lower the pH value with fertilizer
To lower this, you can either use special soil or use fertilizer. The soil is moor bed soil, which lowers the pH value and thus returns the blue color to the plant.
If you don't want to change the entire soil, you can help with fertilizer. This must either contain a lot of aluminum sulfate or you choose one with a lot of potassium, but with little phosphorus. And the blossoms turn blue again!