I just bought a purple wave 14 inch potted plant, and 12 pink wave petunia plugs. I have transplanted them into those brown matted pot hangers for my deck. Now I need to know how to care for them. Do I feed them, and how often should I water them? I leave in the northern corner of the Serria Nevada's, Calif., and want to be sure I'm doing right by these guys. Should they get full sun?