When designing an urban garden, the choice between several small planter boxes versus one long, continuous planter depends heavily on your space, plants, and design goals. Small modular planters offer incredible flexibility - you can rearrange them seasonally, isolate plants with different water needs, and create visual interest through varied heights and groupings. They're perfect for renters or those who enjoy frequently refreshing their garden layout. However, multiple small containers require more individual watering and maintenance attention.
A single long planter creates a striking, unified look that defines spaces beautifully. It's excellent for creating clean lines along balconies or pathways and can make small areas appear larger through continuous planting. Maintenance is often simpler with one large watering session, though you're limited to plants with similar sun and water requirements. The substantial soil volume in long planters also provides better insulation for roots during temperature fluctuations.
Consider your practical needs: small planters work well for experimental gardeners who value adaptability, while long planters suit those seeking low-maintenance consistency and modern aesthetics. Many urban gardeners successfully combine both - using long planters for structural elements and smaller ones for accent plants and herbs.