Like other elements of the garden, the amount that you spend is purely up to you. This tool is designed to let you build a garden within your budget by suggesting a size that will fit the amount you are willing to spend. A typical garden would run $3-5 per square foot, with most gardens between 100 and 300 square feet. This means that the average cost would be between $300 and $1500. With this tool, the best method is to try a variety of numbers and see what results look appropriate for you!