Draw the walking route before drawing the garden. On a narrow apartment balcony, the door swing and a place to stand with a watering can are more useful starting points than a list of plants. Mark the area you can actually use, including any drain, overhang and railing that casts shade. Then sketch containers only inside that area.
Measure the space that must stay open
Measure the usable floor, the door swing and the reach to the railing. Watch where direct sun falls at plant height during the day; an overhang can keep rain off a container while still leaving it exposed to wind. The RHS describes wind, sun and shelter as defining balcony conditions. Check building or lease rules for load, attachments, drainage and access before placing a filled pot. Neither a photo nor a generic plan can establish what your balcony structure can carry.
Make a paper plan with measured widths. For example, on a hypothetical 150 cm usable strip, a 45 cm deep row of pots leaves 105 cm on paper. That arithmetic is not a recommended clearance or a measurement of your balcony: a chair, open door and a person carrying water may make it unusable. Test the positions with empty containers and walk the route before filling them.
Choose a layout that fits the obstacle
Door and path need the floor: try one approved wall-side shelf or a few floor pots outside the door swing, kept low enough to reach without climbing. Check how a full watering can passes each pot. Do not assume a free-standing shelf is windproof; its support and load need to be suitable for outdoor use and the specific site.
The floor is available but the rail is exposed: a single reachable floor container can add height without suspending weight over an edge. Choose the plant for the measured light and wind, and check the total wet weight with the building. RHS notes that balconies have finite load capacity; moving a heavy pot to a corner does not establish that the corner is safe.
The rail would be the only planting space: first find out whether the building permits a planter and fixing for that exact railing. If it does not, keep planting on the allowed floor or shelf. A box can drip on neighbors, obstruct a handrail or detach in wind. Do not set an unsecured pot on an outer ledge to gain sunlight.
Place plants by light, water and access
Put a sun-demanding plant only where its foliage will receive enough measured light. A shaded corner may suit a different plant, but no ornamental or edible plant thrives without some usable light. The small-balcony plant guide helps narrow the choices after the physical layout is settled. Keep taller foliage from shading the only bright position or blocking a neighbor's view without permission.
Make a route for drainage too. A tray can catch runoff, but empty standing water and keep a balcony drain clear. Maryland Extension notes that saucers can protect a neighbor's balcony below; they do not replace drainage in the growing pot. Test with a modest watering and see where the water goes before adding more containers.
Leave room to lift each pot, inspect leaves and clean beneath it. Add the first few plants, then check the layout after wind, rain and a normal week of use. If a container makes the door, path or watering awkward, move the plan on paper before buying another stand.
Test the layout at the time the balcony is busiest. A chair pulled out for dinner can block the watering route that looked generous in the morning. A door that opens inward may need clear space inside too. Keep the floor drain visible and accessible, and check that a full saucer can be removed without carrying it over a railing.
After the first weather change, note which pot dried quickly, which position received little light and whether anything shifted in wind. Those observations can justify moving one container before adding more. A measured, usable arrangement is better than filling every available centimeter with plants you cannot safely tend.
Keep the sketch with the measurements so a future shelf or pot purchase can be checked against the actual remaining space.
