It's a playground mix overseeded in our thin battered grass that took a beating all winter.... with lots of starter fertilizer ;~D.
It really took longer than it should have to germinate, because I seeded a couple weeks before it was warm enough. It just needs to stay wet all the time, and should have at least 50 degree temps at night... We aren't quite there yet, but it is doing well, I think!
Where do you get playground seed mix? I'm sorry to ask so many questions I just have 10 acres to seed by next week and I know it takes forever for Bermuda to come up. Since you mentioned yours came up so fast, I'd love to learn more about it. (Also, do you know what it's a combination of? Bahia? Bermuda? Whatever?) I assume it's all horse edible, nutritious?