With indoor living walls, excess water can be an issue, explains Capanelli. Compared to outdoors, evaporation tends to be slower. Plus, water can collect in wall planters and felt woolen pockets ...

The centerpiece of Drexel University’s new Papadakis Integrated Sciences Building is a 22-foot wide, 80-foot tall biowall—a beautiful and functional wall of plants that purifies indoor air. Designed ...