How to Fertilize hortensia?
For optimal health, bigleaf hydrangea requires balanced nutrition with a fertilizer such as 10-10-10 NPK, applied bi-monthly during growing seasons. Aluminum sulfate enhances blue blooms, while limestone favors pink, though use sparingly to avoid root burn. The color change reflects the soil pH impact on aluminum uptake. Seasonal adjustments in fertilization promote robust growth and vivid blossoms. In winter, reduce feeding to prevent nutrient overload. Always water bigleaf hydrangea thoroughly post-fertilization to aid absorption and prevent chemical concentration at roots.