How can hygrana bushes change colors?

Hydrangea bushes can change colors primarily due to the pH level of the soil in which they are planted. In acidic soils (pH below 6), hydrangeas typically produce blue flowers, while in alkaline soils (pH above 7), they tend to produce pink flowers. The presence of aluminum ions in the soil, which are more available in acidic conditions, also contributes to the blue coloration. This means that by adjusting soil pH, gardeners can influence the flower color of hydrangeas.