How do I care for an outdoor gardenia that has dry, grey leaves?

I had a plant that did that. I left it alone unless they were dead leaves. New leaves have begun to come out in new places. Just have faith in your old plant, and keep on watering it. You ARE watering it, aren't you? :)

How do I care for an outdoor gardenia that has dry, grey leaves?
Give it water. The soil should not be dry but also not soggy. You should be able to touch the soil and not feel the water (too moist) and also not have it stick to your fingers (too dry).