Filling large urban planter boxes can be surprisingly expensive if you use only premium potting mix. The most cost-effective strategy employs a layered approach using filler materials. Start by placing a layer of clean, upside-down plastic pots or recycled plastic bottles at the bottom to improve drainage and reduce volume. Next, add a bulk layer of inexpensive, well-rotted compost or a topsoil/compost blend. Reserve the highest-quality, nutrient-rich potting mix for the top 12-18 inches where most plant roots will grow. Sourcing soil in bulk from local landscape suppliers is far cheaper than buying numerous bags. For even greater savings, create your own mix using one-part compost, one-part topsoil, and one-part aeration material like perlite or coarse sand. This method ensures healthy plant growth while significantly cutting costs, making your urban gardening project both sustainable and budget-friendly.
What is the most cost-effective way to fill large urban planter boxes with soil?
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