Growing lettuce in an urban planter box is a fantastic way to enjoy fresh greens. For a standard 4-foot long, 1-foot wide planter box, the number of plants depends on the lettuce variety and your preferred spacing method.
Using the popular Square Foot Gardening method, you can efficiently calculate your planting. For most loose-leaf or butterhead lettuce varieties, you can plant 4 per square foot. A 4 sq ft planter (4' x 1') therefore holds approximately 16 plants if you use the entire area.
For larger romaine or crisphead varieties, plant 1 per square foot, totaling about 4 plants in your 4-foot box. For a continuous "cut-and-come-again" harvest with loose-leaf types, you can even sow seeds more densely and thin as they grow.
Key Spacing Tips:
* Rows vs. Grid: Planting in a grid pattern maximizes space better than traditional rows.
* Maturity Size: Check your seed packet for the plant's spread at maturity.
* Succession Planting: For a longer harvest, plant a few squares every two weeks.
With proper spacing, your 4-foot urban planter can yield a plentiful, rotating supply of crisp, homegrown lettuce throughout the season.