Use a wood sealant, like polyurethane or a wood-specific waterproofing product, to coat all surfaces of the planter. Ensure the sealant is non-toxic and safe for plants. Alternatively, line the interior with a plastic or rubber liner, securing it in place and cutting drainage holes to allow excess water to escape. Avoid using products with harmful chemicals that could leach into the soil. Reapply the waterproofing treatment every year or two to maintain effectiveness, especially in areas with high humidity or frequent rainfall.
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