Absolutely, yes. Using a liner inside your wooden urban planter box is one of the most effective ways to extend its lifespan significantly. Wood, especially when exposed to constant moisture from soil and watering, is prone to rot, warping, and cracking. A liner acts as a protective barrier that prevents direct contact between the damp soil and the wooden walls, drastically reducing the risk of water damage.
For best results, choose a heavy-duty, waterproof liner material such as a pond liner, thick polyethylene plastic, or a purpose-built planter box liner with drainage holes. Simply place the liner inside the box before adding soil. Make sure to punch or cut several small drainage holes at the bottom of the liner—right above the planter’s existing drainage holes—so excess water can escape without pooling. This prevents waterlogging, which can rot both the liner content and the wood over time.
Additionally, elevating your planter box slightly with feet or bricks allows air to circulate underneath, further preventing moisture from seeping into the wood’s base. Combine this with a liner, and you can expect your beautiful wooden planter to last two to three times longer than an unlined one. So, for durability, plant health, and peace of mind, always line your wooden urban planter box.