 Hydrangeas are a sign that full summer is on its way, and this year that sign is more like a neon-lit billboard. WBZ's Heil Schaffel explains. A warm winter and lots of rain mean a favorite summer flower is going nuts right about now. And those are some of the factors which have contributed to such a bountiful, beautiful, blossoming hydrangea macrophylla or the mopheads.