All plants produce oxygen and remove carbon dioxide, but did you know that some plants purify the air?Plants like peace lilies and spider plants are low-maintenance houseplants that can remove all manner of toxins from the air, including ammonia (present in many household cleaners) and formaldehyde. We'll get into more plants like this shortly.Smog isn't the only air quality concern in cities.Indoor air pollution is just as prevalent (if not more so!) and not only leads to "Sick Building Syndrome" (cold-like symptoms caused by dry, polluted indoor air), it increases the risk of a wide range of health issues. Between just 3 and 6 plants can help significantly reduce this risk factor, according the University of Technology Sydney.Urban Food MovementAlso known as the Urban Farming Movement, this movement encourages people to "grow your own". By bringing gardening closer to urban centers, where most of the world's food is shipped for consumption, we can reduce food production waste, shipping emissions, and greenhouse gases from industrial-scale inorganic farming.Reduce the impact to food production by keeping food sources closer to home. And what's closer to home than your actual home?!Re connection with nature Aside from the actual health benefits of plants, nature provides wonderful emotional and mental benefits as well.Plants bring the positive, calming effects of nature right to your home. In fact, a study by the University of Michigan showed them to increase productivity, creativity, cognitive performance, and memory retention (by up to 20%!).Flowers especially are shown to improve mood, which is why Horticulture therapy is now used as supplementary therapy for patients with dementia, schizophrenia, and depression.Medicinal valueGrowing useful plants may save you money in the long run. Aside from growing food like vegetables and herbs, you can grow all sorts of plants that can be utilized for their medicinal properties.