Which type of grass is best for kids to play on?

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It's better to know before we investing time in Lawn for Growing the right grass for our kids and pets. Kentucky Bluegrass. Cool season grasses do best in most temperatures. Grass helps to humans in lot of ways as it keep healthy all the time.
For playing on Grass I suggest Bermuda Grass and Zoysia Grass as both are enough for warm in cold seasons