Absolutely! Lining your urban planter boxes is a crucial step to protect the structure and ensure plant health, ultimately extending their life for many seasons. Here are key recommendations.
First, the primary purpose of a liner is to create a barrier between the moist soil and the planter's interior walls, especially if it's made of wood. Constant moisture leads to rot, decay, and eventually, structural failure. A liner also helps contain the soil and prevents staining.
For material selection, consider these options:
1. Landscape Fabric: This is a top choice. It's permeable, allowing water to drain freely while holding soil in. It prevents roots from directly contacting the wood, reducing rot risk. Simply drape and staple it inside the box.
2. Plastic Liners (with drainage holes): A durable plastic sheet or pond liner can be effective. Crucially, you must puncture several holes in the bottom to mimic the fabric's drainage. Without holes, water will pool and cause root rot.
3. Cocoa Liners: These biodegradable, natural fiber liners work well for a season or two but will need replacement as they break down.
4. A Drainage Layer: Regardless of your liner choice, start with a 1-2 inch layer of gravel, pebbles, or broken pottery shards at the very bottom. This layer prevents drainage holes from clogging and improves water flow.
The essential steps are simple: Ensure your planter has adequate drainage holes in its actual base. Add your gravel drainage layer. Then, install your chosen liner material, making sure it covers the interior sides and bottom. Trim any excess, and finally, add your potting mix and plants.
By taking this simple lining step, you shield your planter from moisture damage, improve drainage, and create a healthier environment for your plants, making your urban garden investment last much longer.