Find the Right Light for Your Container Garden

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.

Choose a crop for the measured light

Oregon State Extension distinguishes fruiting crops that need substantial sun from leafy crops that tolerate some 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.

Review the layout after planting

Keep your first arrangement simple enough to adjust. If a plant performs poorly, compare its actual conditions with the crop guide before moving it repeatedly. Photograph the layout for your own records and mark changes on your light map.

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.