The area tends to hold water so we drilled drainage holes through the concrete wall to allow extra water to escape. The 2 inch gravel layer below the soil acts as a drain to keep the soil from staying overly saturated.
|spreading gravel drainage layer|
We used a mix of native topsoil, organic garden mix, sand and mulch to form the soil used in the garden.
|soil mix being placed over gravel|
|soil mix spread and ready for irrigation installation|