Whether you need a liner in your wooden urban planter boxes isn't a simple yes or no—it's a strong recommendation. While not always an absolute requirement, using a liner is a crucial step for protecting your investment and ensuring your plants thrive.
The primary reason to use a liner is to protect the wood from constant moisture and soil contact. Untreated wood will rot quickly when exposed to wet soil. A liner creates a barrier, significantly extending the lifespan of your planter box. It also helps contain the soil, preventing it from washing out through gaps in the wood and keeping your balcony or patio cleaner.
For proper drainage, which is non-negotiable for plant health, the liner strategy is key. Do not create a completely sealed, waterproof environment. Instead, use a permeable landscape fabric or a perforated plastic liner. This allows excess water to escape through the drainage holes you've drilled in the planter's bottom, preventing root rot. Always ensure there are adequate drainage holes before adding your liner and soil.
In summary, lining your wooden planter box is a best practice. It safeguards the wood from decay, contains the soil, and—when paired with proper drainage holes—creates an ideal environment for your urban garden to flourish. It's a simple step that saves you money and effort in the long run.