I have put my hydrangeas in a soilless medium. I mean a mixture of coco peat, sand in 4:1 ratio but cocopeat is supposed to be rich in nitrogen. You said that too much of nitrogen promotes only lush green growth with little flowers. Suggest to me what I should do? Should I repot the hydrangeas into normal fertile soil amended with some compost or continue growing it in the same pot by adding bone meal to increase phosphate content of the soil?