Final answer:
Turfgrass seed heads generally form under conditions of ample sunlight, which provides the energy for growth and development. The day and night length influences this process, with extended periods of darkness often triggering flowering in plants.
Step-by-step explanation:
Turfgrass seed heads typically form under conditions where there is ample sunlight. When grass receives sufficient sunlight, it has the energy needed for photosynthesis, growth, and eventually the development of seed heads. This process can be influenced by the length of the day and night, as seen in experiments where plants grown under longer periods of darkness tend to flower, while those under extended light periods do not. In general, many grasses are programmed to initiate seed head production in response to specific daylight conditions, which often mimic their natural growing seasons.