i will be installing a small, well, 35ft x 12 ft, bed at the top of a crosstie wall. my customer wants to put something in to take some of the moisture out because the way the drainage is , at times, water seeps through the x tie wall. one problem is she wants low growing plant cause the house is down below the wall.. it is about 6 foot high. can this be remedied in this way? i will probably suggest a tree in the one corner.it wont block the houseand should soak up most of the moisture. anyideas or criticisms would be appreciated.