Air-purifying plants, organic vegetables, salad greens and seasonal flowers were all the rage at the recently concluded Noida Flower Show 2018: Vasant Utsav. Held at Noida's Ramlila Ground in Sector 21, the three-day event, organised by Noida Authority and The Floriculture Society, focused on the need for water conservation and growing plants – both indoors and outdoors – that help in controlling air pollution.