Hortensia bluemaker 500 g - PokonBlue hydrangeas can sometimes discolour when the soil is not acidic enough. Fortunately, the hydrangea bluemaker from Pokon provides the solution to this problem! With the help of this bluemaker, the hydrangeas will return to their original colour in the next flowering season. For healthy and blue hydrangeas! Instructions for use can be found in the Details.