Protecting your wooden urban planter boxes from rot is essential for their longevity and the health of your plants. The key is using an appropriate liner that creates a barrier between the moist soil and the wood, while still allowing for proper drainage. Without a liner, constant moisture will quickly lead to wood decay.
The best liners create this necessary barrier. Here are the top options:
1. Plastic Liners (Polyethylene or PVC): These are highly effective, waterproof barriers. You can use plastic sheets or custom-cut pieces. It is crucial to drill drainage holes in the plastic liner, positioned to align with holes in the wooden box itself. This prevents water from pooling at the bottom and causing root rot. Avoid letting the liner press tightly against the wood; a small air gap is beneficial.
2. Landscape Fabric: This is a permeable, geotextile material. It allows water and air to pass through while holding the soil in. It won't create a complete waterproof seal, but it significantly reduces soil-on-wood contact and slows down the rotting process. It's an excellent choice for those concerned about over-watering.
3. Pond Liners: Made from durable EPDM or PVC, pond liners are a heavy-duty option for large planters. They are extremely long-lasting and waterproof. As with plastic liners, ensure you provide adequate drainage holes.
4. Recycled Plastic Bags/Burlap: For a quick, low-cost solution, a punctured heavy-duty garbage bag can work temporarily. Burlap is a more natural, biodegradable option, but it will need replacement every season or two.
Critical Installation Tip: No matter which liner you choose, never let it completely cover the drainage holes. Your wooden planter must have several holes in the bottom. When installing the liner, ensure these holes remain clear. Furthermore, consider using a layer of gravel or small stones at the bottom of the planter, beneath the liner, to further improve drainage and air circulation.
By selecting the right liner and ensuring proper installation and drainage, you can enjoy your beautiful wooden planter boxes for many years to come, keeping them structurally sound and your plants thriving.