RE: Best Grass for New field
I don't know much about grasses but I do know it depends on your area. Very likely the best seed to start a field will be a blend. Such as some rye grasses to get established quickly and an annual for durability.
Find a supplier that supports commercial landscapers they will direct you to the best seed for your soil type and need. Also they will have it in large quantities because I’ll bet you will need 50-100 lbs of seed.