Planning
Find the Right Light for Your Container Garden
Observe the exact spot where a plant will sit. A bright balcony can receive very little direct sunlight if neighboring buildings, a roof, or trees interrupt it.
- Measure
- Hours of direct sun
- Repeat
- As the season changes
- Include
- Wind, runoff, and access
Draw a simple light map
On a representative clear day, note when direct sun first reaches each possible container position and when it leaves. Record interruptions rather than assuming all hours between morning and evening are sunny.
Repeat observations as the season changes. Include a lower position near the floor and a higher position if you plan to use a shelf. The railing and neighboring containers can create very different conditions a few feet apart.
Add separate sun intervals rather than counting from the first sighting to the last. A hypothetical spot sunny from 8 to 10 a.m. and again from 1 to 4 p.m. receives five observed hours, not eight. Write the date beside the result. Observations taken at different times of year should remain separate entries rather than becoming one average that hides the seasonal change.
Choose a crop for the measured light
Oregon State Extension recommends six to eight hours of direct sun for fruiting vegetables such as tomatoes and peppers; leafy crops can tolerate some light shade. A tomato and a lettuce planter therefore need not receive equal priority in the sunniest corner.
Most culinary herbs need at least six hours of direct sun, according to Minnesota Extension. Individual crops still need their own assessment. Partial shade does not mean that any dark location will produce a useful harvest.
For your first layout, assign the sunniest suitable position to the crop with the greatest light requirement. Put the final light measurement beside its name in your plan. If no location meets the requirement, change the crop rather than relying on fertilizer to replace light.
Look beyond the sun total
Wind, reflected heat, and access to water affect whether a location is practical. Note a hot wall, an exposed corner, and areas protected from rain. These observations help interpret what happens after planting.
Place taller containers and supports where they will not unnecessarily shade smaller crops. Allow yourself room to inspect leaves and reach the growing medium. A layout that looks tidy from indoors may be awkward to maintain.
Test the layout before filling pots
Put the light map beside your layout, then mark the water source, door swing, walking route, and proposed supports. A sunny position may need a different container arrangement to remain accessible. Try the empty pots in place before filling them, and leave room for the mature plant rather than only its nursery footprint.
If two crops compete for one suitable position, prioritize the one you most want to grow and postpone the other. Avoid treating an unmeasured corner as spare growing capacity. You can reassess it after making another set of observations.
Use region pages to understand the broader season, then use this local record for placement. Your state name cannot describe the shade cast by the building next door.
Sources & further reading
University and public-agency guidance used to check this article. Follow local recommendations when conditions differ.
This guide is a research-based explanation, not a report of a Porchleaf growing trial. Our editorial approach.