Hydrangea macrophylla 'Bailmer' Endless Summer The Original Hydrangea Mophead type that blooms on both new wood and old. Produces clear pink blooms in alkaline soils; blue blooms in acidic. It was the first hydrangea discovered that blooms on the previous year’s woody stems and the new season’s growth. With The Original, you get an endless summer of possibilities and incredible color from spring through fall. Whether you are looking for full foundation plantings, striking container gardens or beautiful cut flower hydrangea arrangements, The Original Endless Summer hydrangea is a hardy, disease-resistant and time-tested sensation.