The Endless Summer 2 gal. The Original Hydrangea Plant is an outstanding ornamental shrub. This is the game-changing hydrangea that really raised the bar for re-blooming hydrangeas. This hydrangea flower shrub produces round mopheads of blue or pink blooms, depending on the soil acidity. It produces flower buds on both old wood left standing from the year before, and on new wood grown from the base this year. Simply put, this shrub just blooms its head off for you, all summer long.