For thriving plants in your urban planter boxes, proper drainage is 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 screen to prevent soil from washing out while allowing water to escape. The first true layer should be coarse materials like horticultural gravel, clay pebbles, or small stones. This layer creates air pockets and a reservoir for excess water. Next, add a thinner layer of intermediate-sized material, such as coarse sand or chunky perlite, to act as a filter between the drainage base and the soil. Finally, fill the box with a high-quality, well-draining potting mix suited to your plants. Avoid using non-porous materials like plastic or packing peanuts, as they can create anaerobic conditions and harm roots. This layered approach prevents waterlogging, encourages robust root growth, and is the key to a successful urban garden.
What's the best way to arrange drainage layers in my urban planter boxes?
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