Filling large urban planter boxes requires careful budgeting for soil costs. The total expense depends on several key factors: the dimensions of your planters, the type of soil you select, and whether you purchase in bags or bulk.
First, calculate the soil volume needed. For a rectangular planter, multiply Length × Width × Depth. Convert this to cubic feet or cubic yards. Most bagged soils are sold in cubic feet (typically 0.75-1.5 cu ft per bag), while bulk is sold by the cubic yard (27 cubic feet).
Soil type significantly impacts price. Basic topsoil is the most affordable but may lack nutrients and proper drainage for containers. Premium potting mix, specifically formulated for planters with a blend of peat, compost, and perlite, offers better results but costs more. A specialized raised bed mix is a popular middle-ground option.
Here’s a general cost breakdown. Bagged soil is convenient for small projects but expensive for large volumes. Expect to pay $5-$15 per 1-1.5 cubic foot bag. For multiple large planters, bulk soil is far more economical, ranging from $30-$75 per cubic yard, delivered. Don't forget to factor in potential delivery fees for bulk orders or a rental fee for a truck if you transport it yourself.
To save money, consider a "hugelkultur" method by filling the bottom third of your planter with untreated wood scraps or leaves to reduce soil volume. Also, check with local landscaping companies for bulk pricing and compare the total cubic yard cost to the equivalent in bags. Investing in quality soil initially leads to healthier plants and better yields, making your urban gardening project a success.