Yes, urban planter boxes can be tall enough to work as a balcony privacy screen, but the best setup is usually a tall planter combined with a trellis and dense planting rather than a planter alone. For seated privacy, look for boxes around 1.0–1.3 m (3.5–4.5 ft) high; for standing privacy, 1.5–2 m (5–6.5 ft) systems are available, often as modular troughs, tall rectangular planters, or planter-and-trellis units. On small balconies, a 1.2–1.5 m planter with 0.6–1 m of foliage or climbing plants above it is often more realistic and less wind-catching.
Choose clumping bamboo, ornamental grasses, evergreen shrubs, or climbing plants such as jasmine or ivy on a sturdy trellis. Use a lightweight potting mix, a root barrier for bamboo, and drip trays to protect neighbours below. Before buying, check balcony load limits, wind exposure, drainage, waterproofing, and building or strata rules. Secure tall planters to the wall or railing only with approved methods, and never rely on a planter as a safety guardrail or block an emergency exit. With the right height, weight, anchoring and planting, tall urban planter boxes are a practical privacy solution for balconies.