For thriving urban planter boxes, I highly recommend using a high-quality, lightweight potting mix specifically formulated for container gardening, not garden soil. The ideal blend should prioritize excellent drainage, aeration, and nutrient retention. Look for a mix containing peat moss or coconut coir to hold moisture and nutrients, perlite or vermiculite to ensure proper drainage and prevent compaction, and compost to provide essential organic matter and slow-release nutrients. A good baseline is a simple recipe of 1/3 peat moss or coir, 1/3 compost, and 1/3 perlite. This creates a loose, fluffy structure that allows roots to breathe and access water without becoming waterlogged, which is the number one cause of failure in containers. Avoid using dense, native topsoil alone, as it will compact quickly in a confined space, suffocating roots. For deeper boxes, you can create a layer of coarse material like crushed terracotta or small stones at the very bottom to further enhance drainage before adding your premium potting mix. Remember to refresh the top few inches of soil with new compost each growing season to maintain fertility and structure for your plants.
What kind of soil do you recommend for filling urban planter boxes?
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