Autumn Joy in my garden begin well but in mid summer the stems and leaves turn yellow. They still have blooms but look so ugly. I thought this condition was from over watering so I mostly allow them rain water with no extra watering but a check of the soil at their base recently revealed very dry soil. Further watering does not bring their appearance back to healthy glossy green. I'm about ready to give up on these "easily grown" plants, as I've been trying them for a few years with no success.