More to explore:
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.
Landscaping: Tips for Your Backyard - Article | The Family Handyman. Retaining wall drainage
When building a retaining wall, lay perforated drainage tubing at the base of the wall slightly above ground level so runoff can drain out without undermining your wall
Google Image Result for cdn.c.photoshelte...
Patios | Masonry Division | Johnson´s Landscaping 4 by Johnson´s Landscaping Service, Inc, via Flickr
terraced steps -- just what I want in Vermont behind the house, off he deck.
Retaining wall...someday I would love this behind our house
Ground cover - Perennial - Snow in Summer Cerastium. A carpet of woolly foliage is topped with crisp white flowers. Grows in full sun to 4 to 6 inches in height and spreads 15 to 18 inches. Hardy to ( - 40) Blooms from late spring to summer.
retaining wall ideas_drawing
Rising retaining wall...a great way to accentuate a flower bed.
Steps and Retaining walls needn't be boring by anniesannuals, via Flickr
Traditional Home Vegetable Garden Design, Pictures, Remodel, Decor and Ideas - page 16
Retaining wall with succulents