A company based in Finland has developed a remotely-monitored smart wall of plants that constantly purifies indoor air. The wall requires little to no management from the owner, and provides a steady supply of clean air. With an online design guide, the plant walls are easily customized to the available space, budget and even plant color preferences. Best of all, the plants used in the walls are allergy-free, and the roots sit in non-organic material, meaning no soil is needed.