Question
I have a hydrangea bush where the bloom is developed on the outer edges but the middle stays compact and undeveloped. What could be the cause of this unusual bloom?

Answer
Hi Tom,
Thanx for your question.  A few from me first if you will please?

1.  How long have you had the shrub?
2.  Is this the first time you've noticed this behavior?
3.  What happens when the bloom fades?

Let me know if you will please.
thx,
Tom