Many duplexes do not have gardens but if you yearn to be surrounded by greenery all year long (and are distressed by dying cut flowers) an indoor or courtyard garden will break up hard walls and angles. While they do require a firm commitment for watering and feeding, plants can be a front-line against dust and allergens by filtering the air in your home.
I often take clients to wholesale nurseries where they can view pots and water features not normally available at retail garden centres - and they are considerably less expensive.
I enjoy working with wood, marble, tiles and wrought iron to create unique water features, planters and displays, to suit the style of the home.