They don’t, in a nutshell.. They are two totally separate entities. If you are reading this, there is a good chance that your natural lawn is not growing very well, it is probably a muddy and mossy mess and potentially burned out! Maybe you have a new construction or are planning a major landscape makeover. The cost of real grass or seed is absolutely not comparable with a synthetic turf project. Natural grass is super cheap initially, and for a reason–you must maintain it consistently, and even then it may not grow properly. A synthetic lawn needs almost no maintenance and is therefore a home improvement, comparable to adding a patio or a deck.