For a thriving deep urban planter box, proper drainage and soil structure are non-negotiable. The best arrangement follows a simple, effective layering system. Start by ensuring your box has adequate drainage holes at the bottom. Cover these holes with a permeable landscape fabric or mesh to prevent soil from washing out while allowing water to escape. The first true layer should be coarse drainage material, such as pebbles, gravel, or clay shards, to a depth of 2-4 inches. This creates a reservoir for excess water, keeping it away from plant roots. Next, add a thin barrier of landscape fabric over the pebbles to separate it from the soil above and prevent mixing. The final and largest layer is your high-quality potting mix. Fill the box, leaving a few inches of space below the rim for watering. This layered approach mimics natural soil conditions, promoting excellent aeration, preventing waterlogging, and ensuring robust root health for your urban garden.
What's the best way to arrange drainage pebbles or layer soil in a deep urban planter box?
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