For Impatiens the zone is a bit tough and heart breaking. Mirablis jalapa 4'o'clock will do well with Salvias playing at their feet plus they love rocks. Aspidistras are good and there is a smaller variegated variety to put down in front. With them Dracenas do well in the shade. No need to dread summer, you just require the plants that love the heat. There are quite a few varieties of Jasmine that love the heat. If it is hot enough, maybe mangoes, guavas, pomegranates, kiwi fruit(vine, male female involved), etc.
Regards,
Arif.
