No, you can transfer it to the ground, BUT, the best time to do that would be autumn. You can do it now, but that means you'll need to give it a couple of gallons of water about every 6 or 7 days up till autumn, unless we're having torrential rain.

Thank you bamboo I might do it and do what you say it will not die then no bamboo ?

No, (unless it gets some kind of disease or something which could happen in a pot anyway) - provided you choose a sheltered spot that isn't fully exposed to sunshine, particularly at midday, where it isn't windy and you keep it well watered as I suggested.