Calculating the number of urban planter boxes needed for a 10-foot wall depends on several key factors: the dimensions of your chosen planters, your desired spacing between them, and your overall layout vision.
First, measure your planter boxes. Standard sizes vary, but let's assume you're using 12-inch wide boxes. For a 10-foot wall (which is 120 inches), you could theoretically fit 10 boxes side-by-side with no gaps (120 / 12 = 10).
However, for a more aesthetically pleasing and healthy garden, spacing is crucial. Leaving 2-4 inches between boxes allows plants room to grow and improves air circulation. With 12-inch boxes and 3-inch gaps, the calculation changes. Each "unit" (box + gap) uses 15 inches.
120 inches (wall) / 15 inches per unit = 8 planter boxes.
This calculation gives you a single, dense row. For a lush, tiered effect, consider stacking boxes in a staggered pattern. This will require more boxes but creates a dramatic vertical garden. Ultimately, sketch your design and adjust the numbers based on your specific planter size and the visual density you want to achieve.