The Best Grass Yard With Gravel And Raised Bed Garden Ideas. Fill the trench with 4 in. If you have a large raised bed, you might want to line the bottom with large stones, plastic bottles, or straw so the water.

The easiest way to build your own garden bed is to use recycled timber. Wood is the obvious and most popular choice because it’s durable and easy to work with. You want to ensure that the timber has not been treated with cca as the nasty chemicals used for this can leach into the soil.