Lay perforated drainage tubing at base Water-soaked soil is the worst enemy of retaining walls because it exerts enormous pressure behind the wall. Adding good drainage behind block or stone walls is crucial for long-lasting, bulge-free walls. Start by laying perforated plastic drainage tubing along the base of the wall slightly above ground level so it can drain to daylight. Slope the tubing about 1/4 in. per foot.
This potting bench is so very simple to make, and so pretty as well as functional. Use 4 x 4's or fence posts with post caps (wood finials), 1 x 4's for the flat surfaces and outside trim boards. She uses cedar which will turn a dark gray, you can also use pressure treated wood and stain it or let it weather gray as well. Simple and easy to make!