Yellowing leaves on a plant are most frequently a watering issue. If it's starting with the leaves at the bottom of the plant, your plant probably is not getting enough.
Thanks Douglas for this tip will take a look and handle this correctly....
I can never figure out the big difference between zonal gernaiums and martha washingtons etc? They always get under watered at sone point at my house...and many of them do come back the next year even though I killed zem I killed zem all the year before (sorry that is star trek reference)