This common spice has several beneficial properties for your orchids. There are times when you need to cut away fungus or bacteria from the leaves of your plants. Sprinkle ground cinnamon directly on the leaves where you made a clean cut to help heal the wound. You can also steep cinnamon sticks in hot water over night to make a mild fungicide. Use the “cinnamon tea” in a spray bottle to treat mild fungus issues. This simple treatment can also reduce fungi growth among your orchids such as mushrooms.