10 foot would be plenty, main things are to get the weeds killed ahead of time, till it up plant it, pack it, then spread some urea on it. it loves nitrogen, mine is still standing from last year, I wouldn't plant it thick though, I would think that would cause it to be spindly because of it's competition with itself for light,water, and nutrients.
Genesis 27:3 "Now therefore take, I pray thee, thy weapons, thy quiver and thy bow, and go out to the field, and take me venison."
Our lives are living epistles, what story does your tell?
John 3:17 "For God sent not his Son into the world to condemn the world; but that the world through him might be saved."