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.
The Town of Ontario is located in Wayne County on the southern shore of Lake Ontario, fifteen miles east of the City of Rochester. It is home to a population of 10,000 as well as the Ginna Nuclear Power Plant and a rapidly developing industrial park. Ontario is ideal for those who seek a high quality of life and value the many benefits of a friendly, close-knit community.