Final answer:
Golf courses in the southwest overseed with annual bluegrass for winter green turf; true as annual bluegrass is a winter annual ideal for green turf during colder months.
Step-by-step explanation:
The statement that golf courses in the southwest are overseeded with annual bluegrass to provide green color during the winter is true. Annual bluegrass, also known as Poa annua, is a winter annual that germinates in the fall, overwinters, and flowers in the spring. This characteristic makes it an ideal choice for maintaining a visually appealing green turf during colder months when other grasses may turn brown. Additionally, the management practices such as mowing can influence the flowering time of grasses, which is relevant to maintaining the golf course turf.