Urban gardening brings nature to concrete landscapes, but understanding sunlight requirements is crucial for planter box success. Most flowering plants and vegetables thrive with 6-8 hours of direct sunlight daily, making south-facing locations ideal. However, urban environments create unique challenges - tall buildings cast shadows, reflected heat intensifies exposure, and microclimates vary dramatically between balconies, rooftops, and street-level planters.
For full sun locations receiving 6+ hours of direct light, consider tomatoes, peppers, herbs like rosemary and thyme, and sun-loving flowers such as petunias and marigolds. These plants will produce abundant blooms and fruits when given adequate sunlight and regular watering.
Partial sun areas (4-6 hours) support lettuce, kale, spinach, and herbs like parsley and mint. Many flowering plants including impatiens and begonias also perform well in these conditions. North-facing locations or heavily shaded areas might only sustain low-light plants like hostas, ferns, and some decorative grasses.
Monitor your specific location throughout the day - sunlight patterns change with seasons and surrounding structures. Remember that container plants dry out faster than ground plantings, so adjust watering frequency according to sun exposure. With proper planning, urban gardeners can create thriving green spaces regardless of sunlight limitations.