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.
<p><b>Lake Monona</b> is a <a href=/pages/w/106001399430681>freshwater</a> <a href=/pages/w/109997622359339>drainage</a> <a href=/pages/w/113018778712129>lake</a> in <a href=/pages/w/137020496321136>Dane County, Wisconsin</a>, surrounded on three sides by the city of <a href=/pages/w/107572595931951>Madison, Wisconsin</a>, and on the south side by the city of <a href=/pages/w/108377495853427>Monona, Wisconsin</a>.