Before filling your new urban planter box with soil and plants, a crucial question arises: does it need sealing or treatment? The answer depends primarily on the material. Untreated wood, like cedar or pine, is highly porous and will quickly rot from constant moisture. Sealing the interior with a waterproof liner or a non-toxic sealant is essential for longevity. For wooden planters, applying a safe, plant-friendly sealant to the interior walls is a critical first-use step. This creates a moisture barrier, preventing rot and protecting the wood from soil acids and fertilizers. Concrete and terracotta pots are also porous and can leach minerals or dry out roots too quickly; sealing their interiors mitigates this. Metal planters may require treatment to prevent rust, especially if drainage holes allow water to sit. Even plastic or resin boxes benefit from a cleaning before use. Ultimately, taking the time to properly prepare your planter box—whether by sealing, lining, or treating—ensures a healthier environment for your plants and significantly extends the life of your investment, making your urban garden more sustainable and beautiful.
Do urban planter boxes need to be sealed or treated in any way before the first use?
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