Yes. There are urban planter boxes made specifically for growing vegetables on a small balcony, although the best options are usually sold as compact, modular, or balcony-ready vegetable planters rather than generic flower boxes. Look for boxes that combine food-safe materials, good drainage, and enough soil depth for the crops you want to grow. For herbs, lettuce, radishes, and other shallow-rooted small balcony vegetables, a soil depth of about 20–25 cm can work well. Tomatoes, peppers, and dwarf beans need closer to 30–40 cm, plus a trellis or support.
Self-watering planters are especially useful on balconies because they reduce watering frequency and help prevent soil from drying out in wind and sun. Modular planter boxes let you connect units along a railing or wall, while vertical and railing-mounted designs save floor space. Check the planter's weight when filled, the balcony's load limit, and your building's rules before installing anything heavy.
For balcony vegetable gardening, choose containers with drainage holes, a removable saucer or drip tray, and lightweight potting mix rather than garden soil. Casters make it easier to move heavy boxes as the sun changes. Avoid shallow, poorly drained, or non-food-safe containers. With the right urban planter boxes, even a small balcony can produce a useful harvest of herbs, greens, and compact vegetables.