If you are growing your Gardenia as a potted plant indoors, keep it out of direct, hot sun, and allow it to only get bright light. I think that your 'black mold' is more than likely an algae growth, which is a cosmetic problem for your plant rather than a health problem.
Monona is a city in Dane County, Wisconsin, United States. The population was 7,533 at the 2010 census. It is completely surrounded by Madison and is part of the Madison Metropolitan Statistical Area.
This article is about the town in Wisconsin. For the Templer settlement, see Sarona (colony). Sarona is a town in Washburn County, Wisconsin, United States. The population was 382 at the 2000 census. The unincorporated community of Sarona is located in the town.