Choosing the right liner for your wooden urban planter boxes is essential for both the health of your plants and the longevity of the planter itself. The primary purpose of a liner is to protect the wood from constant moisture and soil, which can cause rot and decay over time. It also helps to retain soil and prevent it from washing out during watering.
The most common and effective liner materials include:
1. Plastic Liners: A simple and inexpensive option is a heavy-duty plastic sheet or a dedicated plastic planter liner. Ensure you puncture drainage holes in the bottom to prevent waterlogging. While effective, plastic is not the most breathable or environmentally friendly choice.
2. Landscape Fabric: This is a highly recommended, permeable geotextile. It allows water and air to pass through while containing the soil. It protects the wood from moisture but promotes better aeration for the plant roots compared to solid plastic.
3. Pond Liners: For a more heavy-duty and waterproof solution, EPDM rubber pond liners are excellent. They are very durable and flexible, but like plastic, you must create adequate drainage holes.
4. Natural Liners: For an eco-friendly approach, you can use a layer of coconut coir or burlap. These materials are biodegradable and breathable but will need to be replaced every few seasons as they break down.
Regardless of the material you choose, the key is to ensure proper drainage. Always create several holes in the bottom of your liner before placing it inside the wooden box. A good practice is to add a 1-2 inch layer of gravel or pebbles at the bottom before adding your soil and liner to further improve drainage. This setup will protect your wooden planter, prevent root rot, and create a thriving environment for your urban garden.