Help protect your furniture and other surfaces around your house with these plant trays. Now you do not need to worry about the excess moisture that can tend to seep out from the bottom of the planting pot. Helps maintain moisture levels around your Bonsai tree between watering sessions, and these humidity trays help accomplish that. Simply spread the decorative rocks into the tray add water and place your Bonsai on top. As the water evaporates, the humidity around your Bonsai will increase.