 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 mop heads sarah barrios with mahoney's in brighton says it's a stark difference from last year when the hydrangea blossoms were wiped out by some seriously cold weather the buds on the mop head variety you see everywhere live on the plant throughout the winter