the product has been studied on purpose to be used on purple, pink and red hydrangeas. The presence of chelated iron allows to solve the problems of chlorosis. The use of the product on the soil keeps the pH within median values (thanks to the contribution of calcium) and creates an ideal environment to make the colours deeper.
at the time of plantation mix the content of one spoon (8 g) every 4 litres substratum; for maintenance scatter on the soil or bury the content of half or one spoon; treat once a month with 4 applications at most. Then water.