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.
As of the 2000 census, the city population was 3,381. It is the county seat of Shiawassee County. The City of Corunna is located within Caledonia Charter Township, although it is an independent political entity. Michigan Governor Andrew Parsons was a long-time resident of Corunna. A historical marker commemorating Parsons in Corunna was erected in 1969 According to the United States Census Bureau, the city has a total area of 3.1 square miles (8.1 kmÂ²), of which, 3.1 square miles (8.0 kmÂ²) of it is land and 0.04 square miles (0.1 kmÂ²) of it (1.28%) is water.