Do not plant the flower directly into the Hortus pot since the water will damage the brass surface. The surface is also sensitive to objects that can scratch and mar it as well as certain polishing cloths and sponges. Candle wax and grease can be washed off with hot water and then polished with a soft cloth. Avoid using brushes, steel wool and the like.
Keep in mind that humidity can damage table tops and other surfaces. Wipe the pot dry immediately after filling it with water, and always keep it dry to reduce the need for polishing.