This sort of expense can be prohibitive. A stone structure is likely to be a permanent structure making design an important consider- ation. Depending on the stone and the cut, the abrasiveness of the material must be considered. It is available pre- molded or can be poured at the site. Colors, textures, and ma- terials can be added to concrete to give it variety.
Concrete structures can blend tastefully into an urban environment.
Concrete must have appropriate foundations so that it will not be damaged by natural contractions and expansions of the soil. Pouring concrete takes some skill and the concrete must be properly aged so that it will not crumble. This may call for a contractor's service which may be expensive. The finish on the concrete is an important consideration due to possible abrasion factors. Preformed concrete is relatively inexpensive and offers satisfactory planters.