The grass in my lawn (in Connecticut) really thrives in the soil here. If I let it go for a whole month in the may-oct range, then it becomes 12-15cm long and

The grass in my lawn (in Connecticut) really thrives in the soil here. If I let it go for a whole month in the may-oct range, then it becomes 12-15cm long and takes hours and hours for my little mower to get through. Perhaps I just need to grow a different kind of grass?