Growing fresh lettuce in urban planter boxes is a rewarding way to ensure a steady supply of greens for your family. To determine how many boxes you need, start by calculating your family's weekly lettuce consumption. A small family typically uses one to two heads of lettuce per week.
Each standard urban planter box (around 24 inches long and 12 inches wide) can support approximately 4 to 6 lettuce plants if you harvest leaves regularly for a "cut-and-come-again" method. For head lettuce, you can grow about 2 to 3 heads per box, considering proper spacing of 8-10 inches between plants.
For a family consuming two heads per week, you would need a continuous yield. With an average growth cycle of 4-6 weeks for leaf lettuce, a rotation system works best. We recommend starting with 3 to 4 planter boxes. This allows you to stagger plantings every two weeks, ensuring a non-stop harvest. One box can be in the seedling stage, another in active growth, and a third ready for harvest.
Key factors include the lettuce variety (leaf lettuce yields more continuously than head types), sunlight (at least 6 hours of direct sun), and your climate. With proper care, three well-maintained planter boxes can provide ample lettuce for a small family, turning your balcony or patio into a productive mini-farm.