When it comes to filling the bottom of a metal raised garden bed, there are a few options to consider. The purpose of adding a layer at the bottom is to improve drainage and prevent soil from washing out through the drainage holes. Here are some materials you can use:
1. Landscape Fabric: Placing a layer of landscape fabric at the bottom of the garden bed can help to prevent weeds from growing up into your garden bed. It allows water to drain through while keeping the soil in place. Make sure to overlap the edges of the fabric to fully cover the bottom of the bed.
2. Cardboard/Newspaper: Another option is to use cardboard or several layers of newspaper. This acts as a biodegradable barrier that prevents weeds from coming up through the soil. It decomposes over time and enriches the soil with organic matter. Wet the cardboard or newspaper before placing it at the bottom to help it conform to the shape of the bed.
3. Gravel/Pebbles: Adding a layer of gravel or small pebbles can improve drainage in the raised bed. This is especially useful if you have heavy clay soil that tends to retain water. The gravel layer prevents the soil from becoming waterlogged and promotes better root health. Avoid using large stones that could obstruct drainage or damage the metal bed.
4. Compost/Mulch: If you have access to compost or well-rotted manure, you can add a layer at the bottom to provide nutrients to your plants. This layer acts as a natural fertilizer as it breaks down over time. Additionally, adding a layer of mulch on top of the compost helps retain moisture and suppress weed growth.
5. Vermiculite/Perlite: These are lightweight materials commonly used in potting mixes to improve drainage. Mixing vermiculite or perlite with the soil at the bottom of the raised bed can enhance aeration and prevent compaction.
It’s important to note that the choice of materials may vary depending on your specific gardening needs and preferences. Consider factors such as soil type, climate, and the plants you intend to grow. Experimenting and adjusting the layers accordingly can help you create an ideal growing environment for your plants.
