There are several well-publicized lawn products that claim guaranteed growth under virtually any conditions, in virtually any soil. As impossible as that may sound, it’s not that much of a miracle. Garden experts deduce that it’s likely a potent mixture of fast-growth seeds and quick-acting fertilizer. Unfortunately some such grasses are not very attractive, and some have undesirable growth patterns. Perhaps most important of all is the fact that they may not offer very good coverage for your tired lawn, be sure to compare on an equal “per-square” basis, the cost of “miracle grass” to that of a quality seed and fertilizer approach.