Yes, most urban wooden planter boxes greatly benefit from having a protective lining. While not always mandatory, a liner is a crucial feature for longevity. It acts as a barrier between the moist soil and the interior wood walls, preventing constant moisture exposure that leads to rot, decay, and the premature breakdown of the wood. A proper lining also helps contain the soil and can improve drainage when used correctly.
Common lining materials include landscape fabric, which is breathable and allows excess water to drain while holding soil in, and plastic sheeting (with pre-drilled drainage holes). The liner should be installed along the interior sides and bottom before filling with soil. This simple step significantly extends the life of your planter box, maintains a healthier root environment by preventing soil from becoming waterlogged, and protects the wood from chemical interactions with fertilizers. For optimal results, ensure your lined planter box also has adequate drainage holes at the base.