Determining the right amount of sunlight for plants in your urban planter boxes is crucial for their health and productivity. Start by understanding the three main sunlight categories: full sun (6+ hours of direct light), partial sun/partial shade (3-6 hours), and full shade (less than 3 hours). To assess your specific conditions, track sunlight patterns in your space over 2-3 days. Note how light moves across your balcony, patio, or windowsill at different times, observing where shadows fall from buildings or trees.
Check plant tags or seed packets first, as they typically specify light requirements. For urban settings, consider that light reflected from buildings can intensify exposure, while shaded areas might receive less light than expected. Use a sun calculator app or simply take photos hourly to document light patterns. Remember that south-facing locations generally get the most sun in the Northern Hemisphere, while north-facing spots receive the least.
For edible plants like tomatoes and peppers, aim for full sun locations. Leafy greens and herbs often thrive in partial sun. Adjust plant placement seasonally as the sun's angle changes. If your space doesn't provide ideal conditions, consider supplementing with grow lights or selecting shade-tolerant varieties that better match your available sunlight.