Final answer:
The statement is false; while many turf grasses flourish in full sun, there are species adapted to lower levels of sunlight and have varied optimal growing conditions.
Step-by-step explanation:
The statement that all turf grasses grow best in full sun when soil moisture is not limited and soil temperatures are optimal is false. Different species of turf grass have different light requirements, and some grasses are adapted to grow well in shaded areas as well as in full sun. For instance, fine fescue varieties often tolerate lower levels of sunlight better than other grass types. Therefore, the optimal growing conditions for turf grasses can vary significantly depending on the species.