Absolutely! Using a liner in your urban planter boxes is not just acceptable; it's highly recommended for the longevity of your planter and the health of your plants. A liner acts as a protective barrier, shielding the planter material—especially wood—from constant moisture and soil, which prevents rot and decay.
So, what kind of liner should you use? Here are the best options:
1. Plastic Liners: Simple and effective, you can use a heavy-duty trash bag or a plastic pond liner. The key is to puncture drainage holes in the bottom to match the holes in your planter box. Without these, you'll create a swampy environment that harms plant roots. This is a cost-effective choice for rectangular boxes.
2. Fabric Liners (Geotextile Fabric): This is an excellent choice. Landscape fabric or dedicated fabric pot liners are permeable, allowing water to drain freely while containing the soil. This promotes healthy air circulation (air pruning) for the roots, preventing them from becoming pot-bound. It's a top pick for plant health.
3. Pre-formed Plastic Inserts: For a neat, custom fit, you can find rigid plastic inserts sold specifically for certain planter box sizes. These are durable and make seasonal planting changes a breeze.
Before adding any liner, ensure your planter box has adequate drainage holes. The liner's primary job is protection, but proper drainage is non-negotiable for a thriving urban garden. A simple layer of gravel at the bottom is an outdated practice; focus on those drainage holes in the liner and planter instead. Choose a liner that balances protection for your box with the perfect drainage and aeration your plants need to flourish.