Yes—there are urban planter boxes tall enough to use as a standing garden, but they are usually sold as ergonomic raised planters or waist-high garden beds rather than ordinary planter boxes. A comfortable standing height is generally around 30–36 inches (75–90 cm), depending on your height; a surface near your waist or slightly below lets you sow, prune, and harvest without stooping. Many compact models are designed for patios, balconies, and small courtyards, with depths of 10–18 inches and footprints from about 2 to 4 square feet.
When choosing one, check four things. First, working height: measure from floor to rim, not from the top of the soil. Second, drainage and liner: tall boxes need drainage holes, a permeable liner, and feet or casters so excess water can escape. Third, weight: wet soil is heavy, so balcony gardeners should choose lightweight composite, fabric, or self-watering units and confirm the load limit. Fourth, root depth and stability: shallow herbs and lettuce need less soil than tomatoes or root crops, and tall narrow planters should be anchored or placed against a wall in windy spots.
For a true standing garden, look for waist-high raised beds, ergonomic U-shaped or L-shaped planters, tiered standing planters, and mobile planter boxes with locking casters. Some are modular and can be assembled at 30, 32, or 36 inches. If ready-made options are too expensive, a sturdy DIY raised bed on legs can work, but line it well and use a lightweight soil mix. In short, yes: urban planter boxes can be tall enough for standing gardening, provided you prioritize ergonomic height, drainage, weight capacity, and stability.