With large bunches of beautiful blue and purple flowers that first appear in the spring months, endless summer hydrangea is the perfect choice for those who wish to add more color to their garden. But the plant we know as Hydrangea macrophylla 'Bailmer' does not stop there. Instead, it offers continuous blooms during the summer and fall as well. These plants also have large green leaves that are pretty in their own right and are excellent for creating large but interesting plant masses in your yard.