THE SHORT ANSWER
Measure direct sunlight where the plant’s leaves will be, not just whether the room or balcony feels bright. Observe several times during a clear day and repeat as the season changes.
Separate brightness from direct sunlight
A bright place is not automatically a full-sun growing position. Direct sun falls on the plant without a roof, wall, or other solid obstruction blocking it. Reflected light can make a space feel bright while still providing fewer direct-sun hours than a fruiting crop needs.
Choose one actual pot location, not the balcony in general. The outer edge may receive several more hours than a corner by the door. If you plan to raise a container on a stand, observe at that intended leaf height and check that the stand will be stable.
Make a one-day observation sheet
On a clear day, check the spot in the morning, late morning, around midday, and through the afternoon. Record whether it is in direct sun, partial shadow, or shade. More frequent observations give a better estimate of transitions between sun and shade.
A sample record might say “sun by 9:30, shaded before noon, sun again after 3.” Add the actual sunny intervals rather than counting the whole span between the first and last observation. This is an estimate, so keep the notes honest when you miss a period.
Match the crop to the result
University of Maryland Extension gives different light ranges for warm-season fruiting vegetables and cooler-season leafy crops. Tomatoes and peppers generally need a sunnier position; some salad greens tolerate less direct sun. Our crop finder uses cautious starting ranges to help narrow the choices.
When your result sits near a crop’s lower light range, reduce expectations and start with one plant. Avoid buying a large group of sun-loving vegetables for a location you already know receives little sun. A better match is usually less frustrating than trying to compensate with fertilizer.
Revisit the map as your garden changes
Sun angles shift through the year. Nearby trees gain or lose leaves, and your own taller plants can begin shading smaller ones. Repeat the observation before a new season’s planting rather than assuming the spring map lasts forever.
Write the date on the map and keep a photograph from the same viewpoint. If plants lean strongly toward one opening, compare that behavior with your notes. Rearranging a few pots may improve access to light, but maintain safe walkways and do not place heavy containers on unsupported railings.
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Sources & further reading
Extension resources support the growing principles in this guide. Planning examples apply them to small container gardens. Local conditions and variety instructions take priority.
Prepared with AI assistance; this is research-based guidance, not a personal growing trial. Editorial policy · Suggest a correction