How to Build a Retaining Wall: DIY garden retaining walls will help make your garden more beautiful and functional. Use concrete interlocking blocks, cinder blocks or poured concrete for long-lasting DIY rock retaining walls in your garden. These DIY retaining walls are also excellent choices for DIY Garden Retaining Walls, How to Build a Retaining Wall Please note: You are currently browsing img about retaining walls auckland that is 640x426px in size. This image is listed in landscaping ideas around retaining walls category. DIY Garden Retaining Walls, How to Build a Retaining Wall, 640x426 in 63.42 KB.