Yes, in some situations—but not all, and not without careful limits. An urban planter box is heavy once filled with soil, water, and plants, and a brick wall may be solid masonry, a veneer, or a cavity wall. Without drilling, you are relying on friction, straps, existing wall features, or adhesive, so the safe answer depends on weight, exposure, and wall condition.
The most reliable no-drill approach is to avoid putting load on the brick. Use a floor-standing planter frame or trellis with anti-tip feet and wall standoffs. This keeps the box stable while the wall only prevents tipping. For a wall with an accessible top cap, over-the-wall saddle brackets can work for light boxes; they hook over the wall and use the cap for support. Around a brick column or pilaster, stainless steel banding or a strap-around bracket may hold a small planter, but protect the brick and check tension regularly. For a renter-friendly setup, these independent or strap-based options are usually safer than trying to glue a heavy box to the masonry.
Adhesive-mounted brackets are sometimes marketed as no-drill solutions. They may suit a very small, lightweight box on clean, sound brick, but I would not trust adhesive alone for a typical urban planter, especially outdoors. Rain, heat, frost, vibration, and wind can weaken the bond, and a falling planter is a serious hazard. Avoid suction cups and removable hooks for anything beyond lightweight decor.
Before choosing a method, check the wall. Do not hang loads from loose mortar, cracked bricks, or a thin brick veneer unless a qualified professional confirms it is suitable. Keep the planter close to the wall, spread the load, use galvanized or stainless hardware, and add rubber pads to protect the masonry. Choose a lightweight box, use a free-draining soil mix, and keep plants modest to reduce wind leverage.
If the planter is large, heavy, tall, or exposed to strong wind, drilling and proper masonry anchors are usually the safer route, or use a freestanding system anchored to the ground or balcony floor. In short: yes, you can attach an urban planter box to a brick wall without drilling in limited, light-duty cases—but prioritize a secure independent support over adhesive or friction if safety matters.