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.
For other uses, see Birnam Wood (disambiguation). Birnamwood is a village in Marathon and Shawano counties in the U.S. state of Wisconsin. It is part of the Wausau, Wisconsin Metropolitan Statistical Area. The population was 818 at the 2010 census. Of this, 802 were in Shawano County, and 16 were in Marathon County. The village is located mostly within the town of Birnamwood in Shawano County; only a small portion extends into the town of Norrie in adjacent Marathon County.