Fertilising a Hydrangea macrophylla 'The Original Blue'
To maintain the vivid hues and robust health of Hydrangea macrophylla 'The Original Blue', a regular fertilizing schedule is essential. Apply a balanced, slow-release fertilizer in early spring as new growth emerges. This initial feeding will support the development of lush foliage and the formation of flower buds. To intensify the iconic blue blooms, consider using a fertilizer with a higher potassium content and ensure the soil's pH is kept slightly acidic, which aids in aluminum absorption—a key factor in producing blue flowers.
During the growing season, particularly in June and July, a second application of fertilizer can promote continued growth and prepare the shrub for its stunning floral display. Monitor soil moisture levels closely, as this species requires ample hydration, especially when fertilizers are applied, to prevent root burn and ensure nutrient uptake.