I purchased an Endless Summer hydrangea from you at least 6 years ago. The plant is very healthy, however it does not bloom like it should. The most blooms I’ve ever had in one season is 3. So far this year there is only one and there are and no buds developing. What is it lacking? It gets plenty of sun. And it seems to demand a lot of water as the leaves often droop if not watered. What nutrients would you recommend?