The question of whether to line wooden planter boxes with plastic is common among urban gardeners. The answer isn't a simple yes or no—it depends on your specific situation and gardening goals.
Using plastic liners can help protect wooden planters from moisture damage, extending their lifespan significantly. The plastic creates a barrier between the wet soil and the wood, preventing rot and decay. This is particularly important in urban environments where planters are exposed to frequent watering and various weather conditions.
However, proper drainage is crucial when using plastic liners. Without adequate drainage holes, water can accumulate at the bottom, creating conditions perfect for root rot. If you choose to use plastic, ensure you cut several drainage holes in the bottom before adding your soil.
For those concerned about environmental impact, consider using landscape fabric instead of plastic. It allows for better air circulation and water drainage while still providing some protection to the wood. Another alternative is to use a natural wood sealant on the interior of your planter, which can protect the wood without creating the potential drainage issues associated with plastic liners.
If you decide against lining your planter, select rot-resistant woods like cedar or redwood, which naturally withstand moisture better than other types of wood. Regardless of your choice, always use high-quality potting soil and monitor your plants for signs of water stress or root issues.
Ultimately, the decision to line your wooden planter with plastic comes down to balancing wood preservation with plant health considerations in your unique urban gardening space.