Final answer:
The correct starting height for grazing spring-seeded cool-season annuals is 6-8 inches, which is important for establishing a strong root system and ensuring plant sustainability.
Step-by-step explanation:
The appropriate starting height for grazing spring-seeded cool-season annuals is typically between 6-8 inches. This range allows the plants to establish a strong root system while providing enough leaf material to support continuous growth. The height of plants is critical for proper pasture management, similar to how the length of a garden row or the height of a corn stalk is important for crop production. If grazed too early or too short, the plants may not recover well, leading to reduced yields and plant vigor.