Filling deep urban planter boxes entirely with potting soil can be expensive and heavy. The most cost-effective strategy is to use a layered approach with filler materials at the bottom. Start by placing a layer of clean, upside-down plastic bottles or sealed empty milk jugs. This creates a void space for drainage and aeration. Next, add a layer of biodegradable materials like untreated wood chips, fallen leaves, or straw. Top this with a layer of landscape fabric to prevent the soil from settling down. Finally, fill the top one-third to one-half of the box with high-quality potting mix. This method significantly reduces soil usage, cuts costs, makes the planter lighter and easier to move, and still provides ample depth for healthy root growth for most vegetables, herbs, and flowers.
What is the most cost-effective way to fill deep urban planter boxes without using so much soil?
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