Yes, treating the inside of your wooden urban planter boxes is highly recommended. While the exterior finish protects against weather, the interior faces constant moisture and soil contact, leading to rot and decay. For maximum longevity, apply a wood sealant or stain safe for plants (like those labeled for garden use) to all interior surfaces. This creates a moisture barrier. Alternatively, lining the box with heavy-duty landscape fabric or a pond liner is an excellent option. Ensure any liner has drainage holes. For edible plants, use a natural, non-toxic sealant like raw linseed oil or a dedicated planter box liner. Untreated wood, like cedar or redwood, has natural rot-resistance but will still last significantly longer with interior protection. A simple treatment can add years to your planter's life.
Do I need to treat the inside of my wooden urban planter boxes with anything?
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