Blooming Hydrangea

Q:  I purchased four pink hydrangea plants this spring from Hy-Vee.  The plants have grown well and the leaves are beautifully green but the bloom heads have lots of closed buds and only an outer ring of pink blossoms.  They receive morning sun only.  Why aren’t the entire heads blooming?  Carol - Mingo
   
 A:  Be patient; they will come out.  Apply chelated iron (Miracid).  It is a 30-10-10 fertilizer.