On 11 Apr 2004 23:28:49 -0700, (David T) opined:

Are geraniums and petunias compatible together in a tub?
Thanks
David

Yes. They both prefer well drained soil, letting it dry somewhat between
watering. Fertilize them often and remove spent blossoms frequently. Cut
petunias in half about every third week to keep them from getting straggly.