Orchids thrive in warm, humid environments. These humidity trays are the perfect solution to increasing humidity around your plants. Made from rigid black polystyrene, plants sit on the upper grid platform and excess water drains into the tray below. The water evaporates and generates added humidity for plants to thrive. The Small Humidity Tray measures 10" w x 13" l x 2" deep. The Large Humidity Tray measures 10" w x 26" l x 2" deep.