Ella Planter, Resin & Natural Stone, Gray, 8-In. Sq.novelty 8 inch gray ella square planter. includes built in water minder reservoir drainage system which rehydrates plants as needed, making a saucer or tray unnecessary. made from a proprietary blend of resin and natural stone which is frost and uv resistant. features a footed bottom for airflow. can be used indoors by keeping included rubber plug intact, or outdoors by removing rubber plug to allow for drainage.