Yes—an urban planter box can work well as the base of a privacy screen on a terrace, provided you treat it as a small landscape system rather than just a pot. First, check the load capacity of your terrace. Soil, plants, water, and the planter itself are heavy, especially when wet. Choose a lightweight but durable planter with a depth of at least 40–60 cm for shrubs or small bamboo, and deeper if you want climbing plants to establish well. Make sure the planter is stable and anchored against wind, because exposed terraces can experience strong gusts.
Good drainage is essential. Use drainage holes, a gravel layer or drainage cells, and a saucer or tray that will not create a slip hazard or leak onto neighbors. For a faster privacy screen, combine a sturdy trellis with climbers such as jasmine, clematis, or ivy, or use upright evergreen shrubs in a narrow row. Pick plants suited to your climate and sun exposure, and avoid invasive or overly heavy species. Irrigation also matters on exposed terraces; drip irrigation or self-watering inserts can reduce maintenance and keep plants healthy.
Leave access for pruning and checking drainage, and consider privacy rules, landlord requirements, and wind safety. With the right planter, support, and planting plan, an urban planter box can create a green, effective privacy screen without turning your terrace into a structural risk.