On 29 Jul, 18:48, Mitch Mitch@... wrote:
BTW...they are 3 years old. They did fine the first 2 years and I had
to deadhead them every day.

Hi Mitch
To me it sounds as though they are not getting enough moisture at root
zone - very important even if they do like full sun.
They really respond well to an annual mulch to help keep the roots a
little cooler and moist.
Hope this helps
Data