Providing excellent drainage is the most critical step for successful urban gardening in planter boxes. Without it, soil becomes waterlogged, roots suffocate, and plants die. The best method is a multi-layered approach. First, ensure your box has adequate drainage holes—at least one hole per square foot of surface area. Cover these holes with a permeable landscape fabric or mesh to prevent soil from washing out. Next, create a drainage layer at the bottom using materials like horticultural gravel, perlite, or clay pebbles. This layer should be 1-2 inches deep, creating a reservoir for excess water away from the root zone. Finally, choose a high-quality, well-draining potting mix, not garden soil. For extra protection against overwatering, consider adding a moisture meter to your routine. Remember, more plants are killed by overwatering than underwatering, and perfect drainage is your best defense.
What's the best way to provide drainage for my urban planter boxes?
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